Publications

TitleAbstractYear
Filter
PMID(sorted descending)
Filter
identification of foot-and-mouth disease virus replication in vaccinated cattle by antibodies to non-structural virus proteins.antibodies raised in cattle against foot-and-mouth disease virus by vaccination or by experimental infection were distinguished. vaccination elicited only antibodies to virus capsid proteins and the polymerase 3d. virus replication in cattle elicited additional antibodies directed against the non-structural proteins 2b, 2c, 3ab1, and/or 3c irrespective of prior vaccination or whether the cattle exhibited symptoms of disease. non-permissive mice inoculated with virus responded in the same way, in ...19902163574
cultivation of foot-and-mouth disease virus in bhk21 cells grown in microcarrier culture system.when bhk21 cells were grown according to the microcarrier's system, they reached the highest concentration in 72 hrs. the infectivity of foot-and-mouth disease (fmd) virus in bhk21 microcarrier culture increased 10 times compared with the conventional monolayer culture in rolling bottles.19902161995
intracellular expression and processing of foot-and-mouth disease virus capsid precursors using vaccinia virus vectors: influence of the l protease.cdna cassettes of fmdv have been constructed which encode the capsid precursor (p1-2a) alone or with the proteases l and 3c which are required for processing of this precursor to the products 1ab, 1c, and 1d. these cassettes have been analyzed using in vitro transcription and translation reactions and within cells using recombinant vaccinia viruses. processing of the precursors occurred more efficiently in cells than in cell-free systems but similar properties were observed. it was not possible ...19902161149
immune response to foot-and-mouth disease virus in an experimental murine model. ii. basis of persistent antibody reaction.a murine model was used to study the mechanisms involved in the prolonged immune response to live and inactivated foot-and-mouth disease virus (fmdv). the antibody response elicited by the infection persisted throughout the entire life of the animal, while immunization with inactivated virus induced a transient response. the administration of inactivated virus in a water-in-oil emulsion increased antibody titres to values as high as those obtained by infection. there was a high correlation betwe ...19902160145
infectious foot-and-mouth disease virus derived from a cloned full-length cdna.a full-length cdna plasmid of foot-and-mouth disease virus has been constructed. rna synthesized in vitro by means of a bacteriophage sp6 promoter inserted in front of the cdna led to the production of infectious particles upon transfection of bhk-21 cells. these particles were also found to be highly infectious for primary bovine kidney cells as well as for baby mice. the difficulty in cloning the foot-and-mouth disease virus cytidyl tract in escherichia coli was circumvented by joining two sep ...19902159523
heterotypic protection induced by synthetic peptides corresponding to three serotypes of foot-and-mouth disease virus.synthetic peptide vaccines of the general sequence cys-cys(200-213)-pro-pro-ser-(141-158)-pro-cys-gly, where the numbered residues refer to vp1 sequences of three different strains of foot-and-mouth disease virus, have been evaluated in cattle and guinea pigs. high levels of serotype-specific (homotypic) antiviral and antipeptide antibody were produced with each peptide. the a- and o-serotype peptides provided complete protection of guinea pigs against their respective virus challenges. the c-se ...19902157884
the detection and differentiation of foot-and-mouth disease viruses using solid-phase nucleic acid hybridization.thirteen complementary dna (cdna) probes were used to detect the presence of foot-and-mouth disease virus (fmdv) rna extracted from cell cultures. when labelled with 32p, these probes enabled the detection of 1 pg of fmdv-rna, or 1 virus copy per cell. two fmdv a12 probes that coded for the leader, structural protein vp1 region and part of the polymerase gene respectively, showed no hybridization with other closely related picornaviruses. differentiation between fmdv serotypes a, o and c was pos ...19902156879
comparison of vaccine strains and the virus causing the 1986 foot-and-mouth disease outbreak in spain: epizootiological analysis.rnas of the most recent foot-and-mouth disease virus isolated in spain (a5sp86) during the 1986 outbreak, and of the three vaccine strains in use at that time in that country, have been compared. although these viruses are serologically indistinguishable, differences have been found among them by t1 fingerprinting. this genetic heterogeneity affects the immunogenic vp1 gene, with amino acid changes located at the carboxyterminal end of the molecule. vp1-coding sequences obtained have been compar ...19902156389
structural refinement and analysis of mengo virus.the structure of mengo encephalomyelitis virus was refined at 3 a resolution with a final r-factor of 0.221 and a root-mean-square deviation from idealized bond lengths of 0.019 a for 10 a to 3 a data with f greater than or equal to 3 sigma(f). the hendrickson-konnert refinement was restrained by the phases derived from the molecular replacement averaging procedure and constrained by the icosahedral symmetry of the virus. the virus consists of 60 protomers each having three major subunits, vp1, ...19902156078
conformational variability of a picornavirus capsid: ph-dependent structural changes of mengo virus related to its host receptor attachment site and disassembly.the structure of mengo virus had been determined from crystals grown in the presence of 100 mm phosphate buffer at ph 7.4. it is shown that mengo virus is poorly infectious at the phosphate concentration similar to that in which it was crystallized. maximal infectivity is achieved at 10 mm phosphate or less in physiological saline. the phosphate effect is ameliorated when the ph is lowered to 4.6. although it has not been possible to study the crystal structure of the virus at low phosphate conc ...19902155508
neutralizing antibodies to all seven serotypes of foot-and-mouth disease virus elicited by synthetic peptides.uncoupled peptides from all seven serotypes of foot-and-mouth disease virus (fmdv) protein vp1 have been used to elicit neutralizing antibody responses in guinea-pigs. the responses were largely serotype specific, although some significant cross-neutralization was observed. dimeric tandem peptides have also been used to simultaneously elicit neutralizing antibodies to two different fmdv serotypes. the possible existence of structural features common to the b-cell neutralization sites or the guin ...19902155177
foot-and-mouth disease virus protease 3c inhibits cellular transcription and mediates cleavage of histone h3.foot-and-mouth disease virus protease 3c is essential for the processing of the viral precursor polyprotein. it is shown here to also inhibit gene expression in baby hamster kidney cells after transient expression from transfected cdna fragments. protease 3c could not be detected by indirect immunofluorescence in contrast to other cdna-encoded virus proteins, but protein synthesized de novo 16 hr after transfection could be detected by radioimmunoprecipitation. the cellular translation apparatus ...19902154880
protection of cattle and swine against foot-and-mouth disease, using biosynthetic peptide vaccines.a single dose of foot-and-mouth disease (fmd) virus protein 1 (vp1) peptide, expressed in escherichia coli as a fusion protein with 190 amino acids (aa) of the le' protein of the tryptophan operon of e coli, elicited an immune response in steers sufficient to withstand the challenge of exposure to animals with acute fmd. the 58-micrograms dose of viral peptide, composed of a segment of the vp1 from the a12 strain (a12) of fmd virus (fmdv; a12-32dimer) in a tandem repeat configuration of aa137 th ...19902154148
attenuation of mengo virus through genetic engineering of the 5' noncoding poly(c) tract.the murine cardioviruses, such as the mengo and encephalomyocarditis viruses, and the bovine aphthoviruses, such as foot-and-mouth disease virus, are distinguished among positive-strand rna viruses by the presence of long homopolymeric poly(c) tracts within their 5' noncoding sequences. although the specific lengths (60-350 bases) and sequence discontinuities (for example, uridine residues) that sometimes disrupt the homopolymer have served to characterize natural viral isolates, the biological ...19902153940
foot-and-mouth disease virus protease 3c induces specific proteolytic cleavage of host cell histone h3.in foot-and-mouth disease virus (fmdv)-infected cells, the disappearance of nuclear protein histone h3 and the simultaneous appearance of a new chromatin-associated protein termed pi can be observed (p. r. grigera and s. g. tisminetzky, virology 136:10-19, 1984). we sequenced the amino terminus of protein pi and showed that pi derives from histone h3 by proteolytic cleavage. the 20 n-terminal amino acid residues of histone h3 are specifically cleaved off early during infection. truncated histone ...19902153239
inactivation of viral agents in bovine serum by gamma irradiation.cell culture origin or suckling mouse brain origin viruses of akabane disease, aino, bovine ephemeral fever, swine vesicular disease, hog cholera, bluetongue, and minute virus of mice were each suspended in bovine serum. aliquots (1 ml) were exposed to various doses of gamma radiation from a 60co source while at -68 degrees c. aliquots (100-ml) of serum from a steer experimentally infected with foot-and-mouth disease virus were similarly irradiated. the samples were assayed for infectivity in ce ...19902123735
a study of antigenic variants of foot and mouth disease virus type a in india between 1977 and 1985.the structural polypeptides of thirty-three field isolates of foot and mouth disease virus (fmdv) collected in india between 1977 and 1985 were analysed by sds-polyacrylamide gel electrophoresis. they were placed in eleven groups based on their patterns and compared with results of conventional serological (virus neutralisation and complement fixation) tests. variation occurred in the structural proteins of the viruses isolated between 1977 and 1981; however, the polypeptide patterns of viruses ...19901966752
inactivation of foot and mouth disease virus in skimmed milk with propionic acid, citric acid and hydrogen peroxide.in order to protect farm animals from infections such as foot and mouth disease (fmd) and tuberculosis, the pasteurisation of milk and milk products designated for the feeding of animals is compulsory in switzerland. nowadays, milk products are often treated chemically with acids or with hydrogen peroxide in order to keep bacterial contamination low. the capacity of these chemical treatments to inactivate fmd virus in skimmed milk within 6 h at 5 degrees c was tested in this study. the results i ...19901966751
synthetic peptides against foot-and-mouth disease--immunization with vp1-peptides of type o1-kaufbeuren.coupled synthetic peptides, representing the sequences of amino acids 130-160, 141-160 and 145-160 of foot-and-mouth disease virus o1k protein vp1, induced virus-binding and virus-neutralizing antibody response in guinea pigs, rabbits, and pigs. we also detected antibody response in guinea pigs after immunization with uncoupled peptides and in cattle with 21 aa-peptide-keyhole-limpet hemocyanin (-klh). the best results were obtained from 21 aa-peptide-klh and 31 aa-peptide with or without klh or ...19901966360
investigation of the influence of peptide-carrier conjugation on the immunological activity of vp1-peptides of foot-and-mouth disease virus o1-kaufbeuren.we found coupling of short sequences of vp1 to keyhole limpet hemocyanin (klh) by means of glutaraldehyde to be a very complex phenomenon which could only be controlled by strict standardization of components and reaction conditions. considering the results, we may conclude that big immunogenic proteins, like klh, are advantageous for achieving sufficient and specific antibody response with neutralizing activity. when using klh, we did not find simple dependence of immunogenicity or neutralizing ...19901966359
[primary structure of the 3'-terminal region of the rna-polymerase gene in foot-and-mouth virus a22].this study was undertaken for the purpose of determining the primary structure of the 3' end gene of rna polymerase of foot-and-mouth disease virus a22 550. reported are isolation and purification of the virus, isolation of rna, synthesis of cdna, experience obtained from cloning as well as analysis of hybridisation and isolation of plasmid dna. nucleotide sequences, characterised by specific clones, were tested for potential needle structures. also described are homology comparisons among fmd v ...19901966358
cdna-cloning and expression of vp1-specific sequences of foot-and-mouth disease virus types a5 and o1.the rna genome of foot- and mouth disease virus strains a5 westerwald and o1 lausanne has been reverse-transcribed and cloned in lambdaphages or plasmids. identification of cdna-clones containing vp1-specific sequences was achieved by hybridization, restriction mapping, and sequence analysis. vp1-coding cdna-fragments were subcloned into the expression vector pex which led to synthesis of fusion proteins with beta-galactosidase. these fusion proteins reacted with anti-vp1 antibodies on a western ...19901966357
[synthesis of a 17-member peptide (143-159)--the vp(1) protein fragment of a(12) foot-and-mouth disease virus. ii. condensation of fragments].a 17-membered peptide corresponding to the amino acid sequence of (143-159) site of protein vp1 of a12 foot-and-mouth disease virus has been obtained by mixed anhydride method condensations of the earlier synthesized fragments. a norleucine residue has been attached, as a label, to the ends of peptides obtained. the complete deprotection was performed by hydrogenation peptides' hydrochlorides and the products were purified by hplc. the antigenic properties of the synthesized peptides are discuss ...19901965773
[synthesis of a 17-member peptide (143-159)--the vp(1) fragment of a(12) foot-and-mouth disease virus. i. synthesis of fragments (143-145), (146-148), 149-152), (153-155), and (156-159)]. 19901965772
foot-and-mouth disease virus in the llama (lama glama): diagnosis, transmission, and susceptibility.foot-and-mouth disease virus (fmdv) was shown to be transmitted from either cattle to llamas, llamas to swine (interspecies), or llamas to llamas (intraspecies). response to fmdv varied greatly in the 6 llamas studied; 3 llamas developed generalized clinical disease with mild pyrexia, 2 after intradermolingual inoculation, and 1 after exposure to a calf infected with fmdv serotype a24. another contact llama developed vesicular lesions on all 4 extremities but no oral lesions. two contact llamas, ...19901965585
functional aspects of the capsid structure of mengo virus.the three-dimensional structure of the mengo virus capsid has been determined at a resolution of 3.0 a. this achievement is discussed in an historical context, and the general features of picornavirus capsid design are presented. the dynamic functional aspects of the mengo virus capsid--namely its ability to interact with specific receptors on host cells, to dissociate and release the viral genomic rna into the cellular cytoplasm, to assemble with progeny rna molecules and form new virions, and ...19901965133
foot-and-mouth disease virus strains isolated from persistently infected cell cultures are attenuated for mice and cattle.it was previously reported that during serial passage of a bhk-derived cell line persistently infected with foot-and-mouth disease virus, (termed c1-bhk-rc1) the virus became increasingly more virulent for bhk-21 cells (de la torre et al 1988). virus strains isolated from different cell passage levels were tested for virulence in mice and cattle. the results showed that in the course of persistence in bhk cells, fmdv became progressively less virulent for mice and cattle.19901964520
rapid isolation of monoclonal hybridoma cultures by a 'fusion-cloning' method: the requirement for aminopterin.hybridomas were generated by fusing the balb/c sp2/0 myeloma-like cell line with either: (i) splenocytes from balb/c mice immunized with foot-and-mouth disease virus (fmdv), rinderpest virus (rpv), peste des petits ruminants virus (pprv), african swine fever virus (asfv) or pig thymocytes; or (ii) lymph node cells from cattle immunized with fmdv. if the fusion mixtures were plated in cloning medium of methyl cellulose and hat medium, small hybridoma colonies developed which rarely survived. fusi ...19911954000
protection conferred by trpe fusion proteins containing portions of the c-terminal region of capsid protein vp1 of foot-and-mouth disease virus.major immunogenic sites of foot-and-mouth disease virus (fmdv) have been mapped to the c-terminal third of capsid protein vp1; we studied the immunogenicity of a series of trpe-fmdv fusion proteins containing this region of fmdv strain o1 campos. fusion protein trpe-dcn, which contains a dimer of vp1 amino acid sequences consisting of amino acids 200 to 213 linked by a diproline spacer to amino acids 141 to 158 (200-213 approximately p-p-g approximately 141-158), induced the best response. a sin ...19911849980
mouse protection test as a predictor of the protective capacity of synthetic foot-and-mouth disease vaccines.a passive immunity test (mpt) in suckling mice for the quantification of protective anti-foot-and-mouth disease virus (fmdv) antibodies in serum is described. comparisons with titres obtained using conventional serum neutralization tests show that for cattle given synthetic peptide vaccines this in vivo assay is a better indicator of protection, while for convalescent animals and virus-vaccinates both tests are equally valid predictors of immune status. cleavage of fc fragments from anti-virus o ...19911848960
myristoylation of foot-and-mouth disease virus capsid protein precursors is independent of other viral proteins and occurs in both mammalian and insect cells.the myristoylation of the foot-and-mouth disease virus (fmdv) capsid precursor p1-2a and its amino-terminal cleavage product 1ab, expressed from subgenomic cdna, has been analysed. the modification reaction is independent of other fmdv proteins and occurs in both mammalian and insect cells. blocking of the myristoylation site does not prevent efficient processing of the fmdv capsid precursor. a cdna cassette in which the leader protease sequence is substituted by an atg codon produces myristoyla ...19911848606
evidence for dissimilar properties of comoviral and picornaviral rna polymerases.the poliovirus rna polymerase has been synthesized in spodoptera frugiperda cells by using the baculovirus expression system. crude sonicates of these cells exhibited an rna-elongating activity of a synthetic oligo(u) primer with poly(a) or cowpea mosaic virus (cpmv) rna as a template. a similar polymerase activity was found in extracts of insect cells in which foot-and-mouth disease virus (fmdv) proteins, including the putative polymerase, were produced. the analogous cpmv 87k protein and sever ...19911848591
high-affinity antibody induced by immunization with a synthetic peptide is associated with protection of cattle against foot-and-mouth disease.previous work has shown that the synthetic peptide c-c-(200-213)-p-p-s-(141-158)-p-c-g, in which residues 200-213 and 141-158 correspond to immunogenic regions of the vp1 protein of foot-and-mouth disease virus (fmdv), is capable of inducing high levels of neutralizing antibody but only inconsistent protection of cattle against virulent fmdv challenge. the possibility exists that differences in affinity may well underlie the observed variations in biological effectiveness of the anti-peptide ant ...19911847695
human rhinovirus 14 complexed with antiviral compound r 61837.the binding of the antirhinoviral agent r 61837 to human rhinovirus 14 has been examined by x-ray crystallographic methods. the compound r 61837 binds in the same pocket (underneath the canyon floor) as the "win" antirhinoviral agents. it does not penetrate as far into the pocket but causes similar conformational changes in the virus capsid. the movement of residues 1217 to 1221 of viral protein 1 (in the "fmdv loop") is more pronounced for r 61837 than for win compounds. although both r 61837 a ...19911847215
[outbreak of foot-and-mouth disease in northern benin during the 1990-1991 dry season].an outbreak of foot-and-mouth disease damaged the north-benin during the 1990-1991 dry season (november to may). coming from outside the benin, it spread out very quickly in the country essentially because of trans-humant herds. no measures have been taken to limit this sickness which is endemic and which regularly exhibits outbreaks in benin. antibodies to types a, o and sat2 of the foot-and-mouth disease virus were detected in the sera during this outbreak.19911824131
virus survival in the environment.viruses pass into the environment from clinically ill or carrier hosts; although they do not replicate outside living animals or people, they are maintained and transported to susceptible hosts. population concentrations and movement, both animal and human, have been steadily increasing in this century, enhancing transmission of respiratory and enteric viruses and compounding the difficulty of preventing environmental transmission. studies on environmental survival factors of viruses have been m ...19911782426
the mechanism of translation of cowpea mosaic virus middle component rna: no evidence for internal initiation from experiments in an animal cell transient expression system.the possibility that internal initiation of translation is responsible for the synthesis of the middle component (m) rna-encoded 95k protein of cowpea mosaic virus (cpmv) has been investigated by constructing plasmids in which the entire sequence of cpmv m rna was cloned downstream of a chloramphenicol acetyltransferase gene. expression of these plasmids in an animal cell expression system revealed that no synthesis of the proteins encoded by the downstream cpmv open reading frame takes place fr ...19911765773
a cd strategy for the study of polypeptide folding/unfolding. a synthetic foot-and-mouth disease virus immunogenic peptide.the circular dichroism spectrum of the 20-residue immunogenic peptide from the foot-and-mouth disease virus (vp1; 141-160 of serotype a, subtype 12) was solvent- and temperature-dependent. careful solvent titration revealed two isodichroic points and plateaux consistent with stepwise unfolding of specific stable conformations. variable temperature studies in cryogenic solvents and urea perturbation were consistent with the existence of three conformational moieties, the left-handed extended heli ...19911726426
modified-live infectious bovine rhinotracheitis virus (ibrv) vaccine expressing foot-and-mouth disease virus (fmdv) capsid protein epitopes on surface of hybrid virus particles. 19911725233
bovine herpesvirus-1 (infectious bovine rhinotracheitis virus)-based viral vector which expresses foot-and-mouth disease epitopes.a recombinant infectious bovine rhinotracheitis virus (ibrv) vector has been constructed to express bovine growth hormone signal sequence plus a foot-and-mouth disease virus [fmdv (o1k)] capsid protein (vp1) epitope as the n-terminal sequence of an ibrv glycoprotein giii fusion protein on the surface of virus infected cells and on the surface of virus particles. sequences encoding the first 38 amino acids of ibrv giii were deleted from the recombinant to avoid redundant glycoprotein signal seque ...19911722936
[antigenic structure of the foot-and-mouth virus. vi. functional segments of the immunodominant region of the vp1 protein of foot-and-mouth virus strains o1k and a22].b- and t-epitopes have been localized within the protective fragments of vp1 protein, viz., 136-152 of the o1k strain and 135-159 of the a22 strain of the foot-and-mouth disease virus (fmdv). antibodies eliciting after immunization of various animals with the 135-159 a22 peptide are directed to different sites of the peptide. immunogenicity of fragments of the 135-159 a22 peptide on mice correlates with their activity on t-cells of the same animals and protective activity on guinea pigs. the inv ...19911722673
immunoglobulin vh and vk genes of the balb/c anti-foot-and-mouth disease virus (o1) vp1 response: cloning, characterization and transgenic mice.hybridomas producing monoclonal antibodies of different isotypes were isolated from balb/c antibody responses to the capsid protein vp1 of the foot-and-mouth disease virus (fmdv) strain o1. according to antigen binding measured by elisa a weak-binding (81d10, igm) and a strong-binding antibody (113c12, igg2a) were selected. as rna sequencing of productive immunoglobulin vh and vk genes turned out, both chains of the weak-binding antibody (81d10) are encoded by germline (i.e. not mutated) genes w ...19911720503
modified-live infectious bovine rhinotracheitis virus vaccine expressing monomer and dimer forms of foot-and-mouth disease capsid protein epitopes on surface of hybrid virus particles.modified-live, attenuated infectious bovine rhinotracheitis (ibr) hybrid virus vaccines have been constructed by inserting in the major ibrv glycoprotein giii gene chemically synthesized deoxyribonucleotide sequences encoding the bovine growth hormone signal sequence and monomeric or dimeric forms of the foot and mouth disease virus (fmdv) vp 1 epitope sequences. the foreign dna sequences were inserted at the n-terminal end of the ibrv giii coding sequence and were driven by the ibrv giii promot ...19911718244
[synthesis, cloning, and expression of artificial genes, coding antigenic determinants of the foot-and-mouth virus substrain a22].chemical-enzymatic synthesis and cloning in escherichia coli of double-stranded dnas, coding for simple and complex antigenic determinants of foot-and-mouth disease virus (fmdv) strain a22, have been carried out. the simple antigenic determinants are a part of the viral coat protein vp1 (amino acid sequence 131-152 or 131-160) whereas the complex antigenic determinants comprise additionally the amino acid sequence 200-213 of vp1 linked to n-terminus of simple antigenic determinants through a tet ...19911716100
outer membrane protein phoe as a carrier for the exposure of foreign antigenic determinants at the bacterial cell surface.phoe protein is an abundant outer membrane protein of the escherichia coli k-12 outer membrane. this protein can be used as an exposure system to produce foregin antigenic determinants and for their transport to the bacterial cell surface. the system is very flexible, since insertions varying in length and nature could be made in different cell surface-exposed regions of phoe, without interfering with the assembly process of the mutant proteins into the outer membrane. two antigenic determinants ...19911715682
structure of viral b-cell epitopes.four categories of viral epitopes can be distinguished that have been designated cryptotopes, neotopes, metatopes and neutralization epitopes. specific examples of each epitope type are presented and the methods used for locating their positions in viral proteins are described. the epitopes of four well-characterized viruses, namely poliovirus, foot-and-mouth disease virus, influenza virus and tobacco mosaic virus are briefly described.19901714092
chimeric polioviruses that include sequences derived from two independent antigenic sites of foot-and-mouth disease virus (fmdv) induce neutralizing antibodies against fmdv in guinea pigs.five poliovirus recombinants containing sequences corresponding to foot-and-mouth disease virus (fmdv) antigenic sites were constructed. viable virus was recovered from four of these plasmids, in which the vp1 beta b-beta c loop (antigenic site 1) of poliovirus type 1 sabin had been replaced with sequences derived from the vp1 beta g-beta h loop (antigenic site 1) of fmdv o1 kaufbeuren (o1k), chimera o1.1 (residues 141 to 154), chimera o1.2 (residues 147 to 156), and chimera o1.3 (residues 140 t ...19911709696
function of idiotypic networks in vivo: immunisation with idiotype-bearing (id1) antibody induces further production of id1 antibody.injection of balb/c mice with an anti-foot-and-mouth disease virus (fmdv) monoclonal antibody (mab) apparently induced the idiotype network to produce more anti-fmdv (idiotype-bearing) antibody, as determined by hybridoma production. anti-idiotype antibodies were also induced, detected by binding directly to the mab used for the immunizations (the "immunising" antibody). many of the anti-idiotype antibodies were directed against regions in or near the paratope of the immunising mab, since they c ...19911708353
identification of neutralizing antigenic sites on vp1 and vp2 of type a5 foot-and-mouth disease virus, defined by neutralization-resistant variants.five neutralizing monoclonal antibodies (nmabs) obtained against type a5 spain-86 foot-and-mouth disease virus were used to generate a series of neutralization-resistant variants. in vitro and in vivo assays showed that the variants were fully refractory to neutralization by the selecting nmab. on the basis of cross-neutralization and binding assays, two neutralizing antigenic sites have been located on the virus surface; one, located near the c-terminus of vp1, displayed a linear epitope, and t ...19911707983
a t cell epitope in vp1 of foot-and-mouth disease virus is immunodominant for vaccinated cattle.synthetic peptides representing regions of the vp1 protein of foot-and-mouth disease virus strain 01 kaufbeuren were screened for their ability to stimulate proliferation of pbmc from virus vaccinated cattle. sites were identified at residue 21-40 (peptide fmdv32) and in the region c-terminal to residue 161. cells responding to fmdv32 were mhc class ii-restricted, cd4+ and secreted il-2. thus, this region is defined as a th site. of 19 virus vaccinated friesian cattle, 89% (17/19) responded to p ...19911702816
mouse footpad langerhans cells as an indicator for safety of foot and mouth disease virus vaccines.the effect of various vaccines against foot and mouth disease virus (fmdv) was tested on langerhans cell density in the footpad epidermis of mice. injection of monovalent, bivalent and trivalent fmdv vaccines caused a reduction in langerhans cell density in the murine skin, which was more marked at the center of the footpad, the site of injection, than at the periphery. testing of the various components of the vaccine showed that saponin caused a marked reduction in langerhans cells while inject ...19901702792
efficient recognition by rat t cell clones of an epitope of mycobacterial hsp 65 inserted in escherichia coli outer membrane protein phoe.phoe is a pore-forming protein, abundantly expressed in the escherichia coli outer membrane. previous investigations have shown the possibility of inserting antigenic determinants in cell surface-exposed regions of phoe by recombinant dna techniques without disturbing the biogenesis and the functioning of the protein. this method proved to be successful for foot-and-mouth disease virus b cell determinants. we have now shown for the first time that phoe can also be used as a carrier molecule for ...19901702727
detection of foot-and-mouth disease virus by competitive elisa using a monoclonal antibody specific for the 12s protein subunit from six of the seven serotypes.foot-and-mouth disease (fmd) prevention and control programs are dependent upon rapid, reliable diagnostic procedures. the widely used fmd diagnostic complement fixation (cf) procedures require a specific antiserum for each of the seven fmdv serotypes making the tests both cumbersome and difficult to standardize. an fmd diagnostic, monoclonal antibody based inhibition-elisa procedure was developed. the test uses a single monoclonal antibody (mab) that reacts with all european and south american ...19901702246
genetic and phenotypic variability during replication of foot-and-mouth disease virus in swine.a plaque-purified preparation of foot-and-mouth disease virus (fmdv) of serotype c1 (c-s8c1-1), grown in cell culture, was used to infect nonimmunized pigs. no variant genomes were detected in the average populations of 50 viruses isolated from infected animals by direct rna sequencing of the carboxy-terminal half of the vp1 gene. however, a mutant with altered phenotypic properties was present in low proportion in an infected animal. the frequency of mutants resistant to neutralization by sd6 m ...19901700543
sequence analysis of monoclonal antibody resistant mutants of type o foot and mouth disease virus: evidence for the involvement of the three surface exposed capsid proteins in four antigenic sites.sequence analysis of monoclonal antibody resistant mutants of type o foot and mouth disease virus has been performed. distinct clusters of amino acid substitutions conferring resistance to neutralization at each of the four previously defined antigenic sites (mccahon et al., 1989, j. gen. virol. 70, 639-645) have been identified. one site corresponds to the well-known 140-160 region of vp1, a second site is also on vp1, one site is on vp2, and the fourth site is on vp3. all of the amino acid sub ...19901699353
structural and serological evidence for a novel mechanism of antigenic variation in foot-and-mouth disease virus.changes resulting in altered antigenic properties of viruses nearly always occur on their surface and have been attributed to the substitution of residues directly involved in binding antibody. to investigate the mechanism of antigenic variation in foot-and-mouth disease virus (fmdv), variants that escape neutralization by a monoclonal antibody have been compared crystallographically and serologically with parental virus. fmdvs form one of the four genera of the picornaviridae. the unenveloped i ...19901699132
freeze-drying foot-and-mouth disease virus antigens. i. infectivity studies.the ability of foot-and-mouth disease virus strains type o1 bfs 1860 and type a22 irq 24/64 to retain infectivity after freeze-drying with or without additives being made to virus suspensions was studied. the infectivity titres of freeze-dried antigens was assessed at intervals over a six month storage period at various temperatures and also after reconstitution to the liquid phase and storage with or without glycerination. certain additive solutions were necessary to prevent degradation of viru ...19901698805
detection of t1-oligonucleotides of the foot-and-mouth disease virus rna [correction of dna] by silver staining.viral (v) rna was isolated from purified foot-and-mouth disease virus (fmdv) by phenol-chloroform-isoamylalcohol treatment, digested by rnase t1 and separated by one-dimensional polyacrylamide gel electrophoresis (page). the oligonucleotides were detected by silver staining. about 45 micrograms of vrna corresponding to about 100 ml of infectious bhk-21 cell culture fluid yielded a pattern of nearly 20 bands sufficient to differentiate between the fmd viruses.19901698016
synthetic peptides as potential vaccines against foot-and-mouth disease.advances made in our knowledge of the structure of foot-and-mouth disease virus have enabled us to identify a fragment, consisting of 20 amino acids, of one of the four proteins of the particle, which elicits neutralizing antibodies in experimental animals and in cattle and pigs. the fragment has been synthesised chemically by merrifield's solid phase method and biochemically as part of different fusion proteins. the level of the immune response to the peptide, which depends critically on the wa ...19901697533
[primary structure of the gene for protein vp1 from foot-and-mouth disease virus serotype o1 isolated in the ussr].the nucleotides sequence has been determined for the viral rna and some of its cdnas coding for the major antigenic protein of the epidemic stomatitis o1-194 and o1-1618 vp1 viruses. the expressed microheterogeneity has been registered for the population of the strain o1-194.19901694961
antibodies elicited by a biosynthetic peptide related to a major immunogenic area of fmdv a12.foot-and-mouth disease virus (fmdv) capsid contains 60 copies each of four structural proteins, virus proteins 1-4. virus protein 1 (vp1) plays an important immunogenic role, being the only vp that is immunogenic as an isolated protein. even peptides representing a partial amino acid (aa) sequence of vp1 can induce protective immunity in experimental hosts. a 32 aa residue, in a tandem repeat configuration (32dimer), of sero/subtype a-12 lp ab vp1 (aa 132-168) was highly immunogenic for its homo ...19901694429
outer membrane phoe protein of escherichia coli as a carrier for foreign antigenic determinants: immunogenicity of epitopes of foot-and-mouth disease virus.outer membrane protein phoe of escherichia coli was used for the expression of antigenic determinants of foot-and-mouth disease virus. five hybrid phoe proteins were constructed containing different combinations of two antigenic determinants of vp1 protein of the virus. the hybrid proteins were expressed in two e. coli strains and the proteins were correctly assembled into the outer membrane. the inserted epitopes were exposed at the surface of the cell and were antigenic in this phoe-associated ...19901690490
a single amino acid substitution affects multiple overlapping epitopes in the major antigenic site of foot-and-mouth disease virus of serotype c.neutralizing monoclonal antibodies (nmabs) elicited against foot-and-mouth disease virus (fmdv) of serotype c were assayed with field isolates and variant fmdvs using several immunoassays. of a total of 36 nmabs tested, 23 recognized capsid protein vp1 and distinguished at least 13 virion conformation-independent epitopes involved in neutralization of fmdv c. eleven epitopes of fmdv c-s8c1 have been located in segments 138-156 or 192-209 of vp1 by quantifying the reactivity of nmabs with synthet ...19901690261
analysis of immune responses in the sheep to synthetic peptides of foot-and-mouth disease virus using ovine polyclonal and monoclonal antibodies.a 40-residue peptide incorporating residues 200-213 and 141-158 of foot-and-mouth disease virus vp1 capsid protein strain o1 kaufbeuren was injected uncoupled into sheep, and the immune responses analysed. direct-binding and inhibition experiments showed that the polyclonal antibody response was directed mainly against epitopes unique to the 40-residue peptide but absent from the constituent peptides containing residues 200-213 or 141-158, respectively. further confirmation of the presence of un ...19901690176
heterotypic recognition of foot-and-mouth disease virus by cattle lymphocytes.lymphoproliferation against foot-and-mouth disease (fmd) virus was examined using peripheral blood mononuclear cells from vaccinated cattle. ten weeks after revaccination the optimum conditions for proliferation were obtained with 1 microgram/ml of purified virus after 5 to 6 days in culture. this contrasted with the response at 20 months post-revaccination, when the response required less antigen and showed a peak response after 3 to 4 days in culture. proliferation was specific for fmd virus, ...19901689767
rgd-containing peptides of vp1 of foot-and-mouth disease virus (fmdv) prevent virus infection in vitro.rgd-containing peptides from the immunodominant region of vp1 between amino acids 135-160 from foot-and-mouth disease virus (fmdv) type o1 kaufbeuren (o1k) prevented virus adsorption to piglet kidney (pk) cells. the highly conserved amino acid rgd sequence (arg.-gly.-asp.) was a prerequisite of this effect. to prevent infection with 100-200 tcid50 in 10(6) pk cells, 20-250 micrograms of each peptide should have been added.19911683122
expression of an active foot-and-mouth disease virus rna polymerase in escherichia coli.the expression of a native form of the foot-and-mouth disease virus rna polymerase was obtained. two oligonucleotides of 66 base pairs were used to rebuild the 5' end of the gene and to introduce the first methionine codon. the expression of the active polymerase in e. coli was achieved by inserting the gene before the tac promoter of the pkk223-3 plasmid.19911668400
[immune response in mice induced by different doses of foot-and-mouth disease virus].response against foot-and-mouth disease virus 01 campos on vaccinated female mice and suckling litter was estimated. vaccine doses ranged between 0.05 and 30 micrograms of virus. the lower dose protected 39.5% of suckling litter whereas 100% protection was achieved using the higher doses. serum neutralization indexes in females, at 45 days post vaccination, ranged from 3.60 to 4.86 for 0.05 microgram to 0.10 microgram and 4.86 to 5.50 for the high doses. although the doses were excessively high ...19911667697
enhancement of the immune response elicited with foot-and-mouth disease virus vaccines by an extract of the mycobacterium sp. wall.the immunomodulating effect of an extract of the cell wall of mycobacterium sp. (wsf, vetrepharm inc., london, canada) in foot-and-mouth disease virus inactivated vaccines was tested in a murine model. the duration of immunity, protection, stimulation of immunocompetent cells acting on the long-lasting secondary response and possible tissue damage were examined. the incorporation of 10 micrograms wsf into aqueous and oil vaccines induced a high and long-lasting specific antibody response. the ne ...19911667346
the detection of antibodies against foot-and-mouth disease virus (fmdv) in filter paper eluates from pig sera or whole blood by elisa.the use of pig blood samples dried on paper discs for the detection of antibodies against fmdv by the liquid phase blocking elisa has been evaluated. the average volume of whole heparinised blood required to fully saturate 6.0 mm discs was 7.65 microliters (range 7.2 to 8.1; variation = 0.24, p = 0.05). when 200 clinically healthy animals were assessed by virus neutralisation (vn) titres up to 1/22 were recorded against types o, a and c, 97% being 1/11 or less. using elisa, results were more ske ...19911666636
rapid and sensitive detection of foot-and-mouth disease virus in tissues by enzymatic rna amplification of the polymerase gene.direct detection of foot-and-mouth disease (fmd) virus from infected bovine and porcine tissue was investigated using a modified polymerase chain reaction (pcr) technique. a high degree of conservation was found in the genomic region coding for the viral rna polymerase among the seven fmd viral (fmdv) serotypes. an oligomeric primer pair and probe were constructed from consensus sequence data within this area. first strand cdna was synthesized using random hexamers and moloney mulv reverse trans ...19911666635
evaluation of a trapping elisa for the differentiation of foot-and-mouth disease virus strains using monoclonal antibodies.a trapping enzyme-linked immunosorbent assay (elisa) has been evaluated for the differentiation of foot-and-mouth disease virus (fmdv) strains using a panel of seven anti-serotype o monoclonal antibodies (mabs). the variation of results within and between tests performed on the same day and on different days was examined using three strains of fmdv. criteria for establishing antigenic differences between the strains as defined by the individual mabs are proposed based on the variability measured ...19911665700
an overview of the inactivation of fmdv and the implications when residual virus is present in vaccines.most foot-and-mouth disease (fmd) vaccines are prepared by inactivating the virus with acetylethyleneimine or binary ethyleneimine. however, formaldehyde is still used by some manufacturers despite the well-documented evidence that inactivation with this reagent is not a linear or first-order reaction. recent german work provides clear evidence that almost all the outbreaks in western europe in recent years have been caused by viruses closely related to strains which were isolated more than 20 y ...19911665462
[protection from foot-and-mouth disease virus in naturally-susceptible animals by a linear polymer of a synthetic peptide].linear polymer of a peptide corresponding to the fragment 142-155 of the foot-and-mouth disease virus a22(550) protein (vp1) was synthesized. whereas the monomeric peptide was only slightly immunogenic, the polymer induced virus-neutralizing antibodies in rabbits and protected 100% guinea pigs. sheep vaccinated once and cattle vaccinated twice were stable against infection with the homologous virulent foot-and-mouth disease virus.19911665331
detection and localization of single-base sequence differences in foot-and-mouth disease virus genomes by the rnase mismatch cleavage method.the rnase mismatch cleavage method was examined for its efficiency of indicating single-base sequence differences in the capsid protein-coding regions of different foot-and-mouth disease virus subtype o1 strains. the method was found suitable for indicating such differences. rnase a as well as rnase t1 contributed to substrate conversion. examples for the cleavage of eleven different single-base mismatches in rna double-strands are now known. all virus genomes found to differ from each other exh ...19911664431
foot-and-mouth disease virus o1lombardy is biochemically related to o2 isolates.the capsid protein vp1-encoding rna regions of the foot-and-mouth disease virus isolates o1lombardy/1946 and o2brescia/1947 were sequenced and found to be closely related to each other and to o2normandy/1949, despite some sequence differences. the o1lombardy sequence was expected to be more closely related to those of the subtype o1 isolates of 1965 and later (e.g., o1kaufbeuren/1966), but this was not the case. the serological subtyping of both the lombardy and the kaufbeuren isolate as o1 stra ...19911663294
hepatitis a virus attachment to cultured cell lines.identification of a hepatitis a virus (hav) receptor is important for understanding hav tissue tropism and replication sites and in the design of vaccines and antiviral therapy. the attachment of hav to cultured cell lines was evaluated: calcium-dependent specific attachment of four hav strains to permissive cells occurred, whereas binding to nonpermissive cells did not. investigation of hav antigenic variant strains (neutralization escape mutants) demonstrated identical attachment properties wi ...19911659597
[detection of neutralizing antibodies in calves after single vaccination against foot-and-mouth disease virus type asia 1 in the field].on june 20th 1984 appeared the first fmd-type asia 1 outbreak in greece. around the outbreak all susceptible animals were vaccinated with asia 1 vaccine produced by iffa mereiux. three weeks after this first vaccination blood samples have been collected and examined for neutralizing antibodies. from 101 examined calves 37 were younger than 6 months, 63 between 6-11 months and one was 12 months old. the titer of the first group was less than 1.2 in 14 and greater than 1.8 in 8 calves. by the seco ...19911659374
expression, processing, and assembly of foot-and-mouth disease virus capsid structures in heterologous systems: induction of a neutralizing antibody response in guinea pigs.plasmids containing the foot-and-mouth disease virus structural protein precursor (p1) and 3c protease genes or the p1 gene alone were expressed in escherichia coli. a recombinant baculovirus containing the p1 gene was also generated and expressed in spodoptera frugiperda cells. expression of the p1 and 3c genes in e. coli resulted in efficient synthesis and processing of the structural protein precursor and assembly into 70s empty capsids. this material reacted with neutralizing monoclonal anti ...19911658362
interaction of a cellular 57-kilodalton protein with the internal translation initiation site of foot-and-mouth disease virus.a cellular 57-kda protein (p57) that binds specifically to the internal translation initiation site in the 5' untranslated region of foot-and-mouth disease virus rna was detected in cell extracts of different mammalian species by uv cross-linking. the protein binds to two distinct sites of the translation control region which have as the only common sequence a uuuc motif. the first binding site consists of a conserved hairpin structure, whereas the second binding site contains an essential pyrim ...19911658355
comparison of the 5' and 3' untranslated genomic regions of virulent and attenuated foot-and-mouth disease viruses (strains o1 campos and c3 resende).the complete 5' and 3' non-coding regions of two attenuated south american foot-and-mouth disease virus (fmdv) vaccine strains, o1c-o/e and c3r-o/e, and their corresponding virulent parental strains, o1 campos and c3 resende, have been cloned from polymerase chain reaction-amplified primary cdna. differences observed in the derived nucleotide sequences between attenuated and virulent viruses seem not to affect regulatory signal structures, supporting the theory that genetic variations, primarily ...19911658210
cleavage of foot-and-mouth disease virus polyprotein is mediated by residues located within a 19 amino acid sequence.the 2a region of the foot-and-mouth disease virus (fmdv) polyprotein is only 16 amino acids in length. during synthesis of the fmdv polyprotein a primary proteolytic processing event occurs between the 2a and 2b regions of the polyprotein. the activity responsible for this cleavage is not known but it is thought that either an unidentified virus-encoded proteinase may be responsible, or that 2a acts as a substrate for a host cell proteinase. a series of recombinant fmdv polyproteins has been con ...19911658199
the capsid protein-encoding sequence of foot-and-mouth disease virus o2brescia.nucleotide sequences encoding the four capsid proteins of foot-and-mouth disease virus subtype o2brescia/1947 have been determined. these and the deduced amino acid sequences were compared with those of a subtype o1 virus strain. the nucleotide sequences differed at 259 positions, causing only 35 amino acid changes. vp4 and vp2 differed by 2.4 and 1.8%, whereas vp1, known as major viral antigen, and vp3 differed by 8% and 5.5%, respectively. the differences occur mainly in protein domains not in ...19911656918
fixation of mutations at the vp1 gene of foot-and-mouth disease virus. can quasispecies define a transient molecular clock?the number of nucleotide (nt) substitutions found in the vp1 gene (encoding viral capsid protein) between any two of 16 closely related isolates of foot-and-mouth disease virus (fmdv) has been quantified as a function of the time interval between isolations [villaverde et al., j. mol. biol. 204 (1988) 771-776]. one of them (isolate c-s12) includes some replacements found in isolates that preceded it and other replacements found in later isolates. the study has revealed alternating periods of rap ...19911653754
two mechanisms of antigenic diversification of foot-and-mouth disease virus.the amino acid replacements that underlay the diversification of the main antigenic site a (vp1 residues 138 to 150) of foot-and-mouth disease virus (fmdv) of serotype c have been identified. sixteen new vp1 sequences of isolates from 1926 until 1989 belonging to subtypes c1, c2, c3, c4, c5, and unclassified are reported. the reactivities in enzyme-linked immunoelectrotransfer blot assays of capsid protein vp1 with a panel of neutralizing monoclonal antibodies that recognize sites a or c (the vp ...19911653494
immunological evaluation of the multiple antigen peptide (map) system using the major immunogenic site of foot-and-mouth disease virus.the multiple antigenic peptide (map) system for presenting epitopes to the immune system has been studied with an immunogenic foot-and-mouth disease virus (fmdv) peptide comprising amino acids 141-160 of protein vp1. neutralizing antibody responses known to protect guinea-pigs against challenge infection were obtained with a single inoculation of 0.8-4 micrograms of peptide, presented as an octamer or a tetramer, whereas 20 micrograms of a dimer were required to evoke a similar level of antibody ...19911652552
putative papain-related thiol proteases of positive-strand rna viruses. identification of rubi- and aphthovirus proteases and delineation of a novel conserved domain associated with proteases of rubi-, alpha- and coronaviruses.a computer-assisted comparative analysis of the amino acid sequences of (putative) thiol proteases encoded by the genomes of several diverse groups of positive-stranded rna viruses and distantly related to the family of cellular papain-like proteases is presented. a high level of similarity was detected between the leader protease of foot-and-mouth-disease virus and the protease of murine hepatitis coronavirus which cleaves the n-terminal p28 protein from the polyprotein. statistically significa ...19911652473
correlations between the conformations elucidated by cd spectroscopy and the antigenic properties of four peptides of the foot-and-mouth disease virus.the conformational features of four related antigenic peptides (a, b, c and usa) from the foot-and-mouth disease virus (fmdv) (vp1; 141-160 of serotype a, subtype 12), assessed by cd, were found to correlate with the serological properties of these peptides. the cd spectra of the four peptides, obtained under cryogenic and solvent titration conditions, were consistent with three conformational components (a left-handed extended helix, an alpha-helix and a 3(10) helix) for peptides a and c and fo ...19911651235
a preliminary study of the pathogenesis of foot-and-mouth disease virus using in situ hybridization.five adult guinea pigs were inoculated intraepithelially in the right hindfoot pad with foot-and-mouth disease virus. animals were euthanatized with carbon dioxide at 4, 10, 24, 48, and 72 hours post-inoculation. generalized disease developed in the guinea pigs, as evidenced by depression and inappetance by 24 hours post-inoculation and by the formation of vesicles in the noninoculated hindfoot pad by 48 hours post-inoculation. by in situ hybridization, using a 500 base pair biotinylated rna pro ...19911650051
comparison of the immune response elicited by infectious and inactivated foot-and-mouth disease virus in mice.the immune response to foot-and-mouth disease virus (fmdv) elicited by infection or immunization with inactivated virus in adult mice was examined. a model of adoptive transfer of immunocompetent cells was used for this purpose. the results presented here indicate that both short- and long-term secondary immune responses elicited by high doses of inactivated virus are indistinguishable, at the humoral or cellular level, from that observed after infection. the responses to inactivated or infectio ...19911649903
fitness alteration of foot-and-mouth disease virus mutants: measurement of adaptability of viral quasispecies.we document the rapid alteration of fitness of two foot-and-mouth disease virus (fmdv) mutants resistant to a neutralizing monoclonal antibody. both mutants showed a selective disadvantage in bhk-21 cells when passaged in competition with their parental fmdv. upon repeated replication of the mutants alone, they acquired a selective advantage over the parental fmdv and fixed additional genomic substitutions without reversion of the monoclonal antibody-resistant phenotype. thus, variants that were ...19911645804
antigenic stability of foot-and-mouth disease virus variants on serial passage in cell culture.two neutralizing monoclonal antibody (mab)-resistant variants selected from an isolate of foot-and-mouth disease virus (fmdv) type a5 were repeatedly passaged in cell culture and monitored for susceptibility to neutralization by the selecting mab. a variant isolated with a mab to a conformational epitope (1-og2) lost resistance in 20 passages, while a variant isolated with a mab to a linear epitope (1-ha6) persisted for 30 passages. in both cases, the virus population emerging after passage was ...19911645803
foot-and-mouth disease virus c3 resende subtype analysed by means of competition ria using neutralizing monoclonal antibodies.foot-and-mouth disease virus (fmdv) was analysed using 30 monoclonal antibodies (mabs) obtained from balb/c mice immunized with fmdv c3 resende (c3r) subtype 7 and 14 days before fusion no. 15 and 16 respectively. fourteen mabs were neutralizing and by means of competition radioimmuno assay it was possible to classify them into four groups. the first group consisted of mabs specific for three sequential and three conformational epitopes. the second group consisted of mabs specific for two confor ...19921379398
studies on antigenic variability of c strains of foot-and-mouth disease virus by means of synthetic peptides and monoclonal antibodies.peptides representing the sequence of the immunodominant loop of foot-and-mouth disease virus strain c-s8 (ytasargdlahltttharhlp, residues 136-156 of vp1) and of several variant viruses have been prepared by solid phase methods. in addition, five peptides with single-residue replacements at leu147 (ile, nle, val, ala, gly) have been synthesized. tosyl and dinitrophenyl protections for histidine have been compared, the latter being found to give better synthetic products. the peptides have been t ...19921378821
characterization and immune response of a protein produced by a cdna clone of foot and mouth disease virus, type asia 1 63/72.a 0.9 kb double stranded cdna of foot and mouth disease virus (fmdv) type asia 1, 63/72 was cloned in an expression vector, pur222. a protein of 38 kd was produced by the clone which reacted with the antibodies raised against the virus. a 20 kd protein which may be derived from the 38 kd protein contained the antigenic epitopes of the protein vp1 of the virus. injection of 10-20 micrograms of the partially purified 38 and 20 kd proteins or a lysate of cells containing 240 micrograms of the prote ...19921378734
non-additive effects of multiple amino acid substitutions on antigen-antibody recognition.synthetic peptides have been used to mimic the main antigenic site of foot-and-mouth disease virus (fmdv) of serotype c and of several variant isolates. this region includes multiple continuous b cell epitopes. the effect of single amino acid replacements, individually or in combination, on antigen specificity has been evaluated using monoclonal antibodies. quantitative enzyme immunodot assays have shown that both additive and non-additive effects of multiple replacements occur in continuous b c ...19921376255
antigenic relationships of foot-and-mouth disease virus serotype asia-1 isolates demonstrated by monoclonal antibodies.a panel (26) of monoclonal antibodies (mabs) was elicited against three distinct isolates of foot-and-mouth disease virus (fmdv) serotype asia-1. each mab was characterized according to the location of its epitope: class i, restricted to the intact virion (140s); class ii, restricted to 140s and the virion protein subunit (12sps); class iii, available on 140s, 12sps and virus protein 1; class iv, restricted to 12sps. in addition, the mabs were further categorized by isotype, neutralization of vi ...19921375792
modulation of t-cell reactivity to synthetic peptide analogues of foot-and-mouth disease virus in sheep by amino acid substitutions.the ability of synthetic peptide analogues of foot-and-mouth disease virus vp1 capsid protein to induce t-cell proliferation in vitro following immunization of sheep with the uncoupled peptides was assessed. elevated t-cell responses were obtained to a 21-residue peptide containing vp1 residues 141-158, and a 40-residue peptide containing residues 200-213 and 141-158 linked via a diproline-serine spacer. in contrast, no significant t-cell response was obtained with a 19-residue peptide containin ...19921375405
modification of foot-and-mouth disease virus o1 caseros after serial passages in the presence of antiviral polyclonal sera.foot-and-mouth disease virus (fmdv) shows a remarkable antigenic variability and, like other rna viruses, presents a high rate of mutation. it has been proposed that selection exerted by antibodies of the host could play a major role in the rapid evolution of fmdv. the present work reports the selection of fmdv antibody-resistant (nr) populations after serial passages of a cloned fmdv o1 caseros strain on secondary monolayers of bovine kidney cells in the presence of subneutralizing antiviral po ...19921374806
cross-reactive and serotype-specific antibodies against foot-and-mouth disease virus generated by different regions of the same synthetic peptide.synthetic peptides based on the vp1 proteins of two serotypes of foot-and-mouth disease virus (fmdv) and having the general formula c-c-(200-213)-p-p-s-(141-158)-p-c-g induce heterologous as well as homologous protection against challenge. substitution of the sequence consisting of residues 200 to 213 (200-213 sequence) with a second copy of the homologous 141-158 sequence (i.e., homodimers) resulted in failure of either serotype peptide to protect heterologously. the antiviral and antipeptide t ...19921372368
Refresh
firstprev
...4142434445
nextlast
Displaying items 4101 - 4200 of 4462