| myxozoa of deep-sea fishes in the northwestern atlantic. | the gall bladder of 5 species of deep-water fishes (coryphaenoides armatus, coryphaenoides rupestris, macrourus berglax, antimora rostrata, and synaphobranchus kaupi) from the new york bight and carson canyon areas in the northwest atlantic were examined for myxozoan parasites. myxidium coryphaenoidium was found in 4 fish species, whereas auerbachia pulchra and ceratomyxa sp. were each observed in 1 fish species. prevalence of myxozoan infections was greater in fishes taken off the new york bigh ... | 1990 | 2319435 |
| pressure effects on actin self-assembly: interspecific differences in the equilibrium and kinetics of the g to f transformation. | purified skeletal muscle actins from species whose ambient pressures range from 1 to greater than 500 atm were examined for the sensitivity to hydrostatic pressure of the globular (g) to filamentous (f) self-assembly reaction. both the equilibrium position and the kinetics of self-assembly were affected by pressure. increased pressure shifted the self-assembly equilibrium toward the monomer (g) state and reduced the rate of f-actin assembly. for most of the actins studied, the perturbation by pr ... | 1985 | 3994993 |
| the effects of hydrostatic pressure on pertussis toxin-catalyzed ribosylation of g proteins from deep-living macrourid fishes. | to test the effects of hydrostatic pressure on the coupling of receptors to guanyl nucleotide binding reglatory proteins (g proteins) in transmembrane signaling, pertussis toxin (ptx)-catalyzed [32p]adp-ribosylation was used to probe the guanyl nucleotide-binding proteins gi and g(o) in brain membranes from four marine teleosts. these macrourids, coryphaenoides pectoralis, coryphaenoides cinereus, coryphaenoides filifer and coryphaenoides armatus, span depths from 200 to 5400 m. pertussis toxin ... | 2000 | 10840646 |
| trimethylamine oxide, betaine and other osmolytes in deep-sea animals: depth trends and effects on enzymes under hydrostatic pressure. | most shallow teleosts have low organic osmolyte contents, e.g. 70 mmol/kg or less of trimethylamine oxide (tmao). our previous work showed that tmao contents increase with depth in muscles of several pacific families of teleost fishes, to about 180 mmol/kg wet wt at 2.9 km depth in grenadiers. we now report that abyssal grenadiers (coryphaenoides armatus, macrouridae) from the atlantic at 4.8 km depth contain 261 mmol/kg wet wt in muscle tissue. this precisely fits a linear trend extrapolated fr ... | 2004 | 15529747 |
| haematozoans from deep water fishes trawled off the cape verde islands and over the porcupine seabight, with a revision of species within the genus desseria (adeleorina: haemogregarinidae). | archived blood smears from 32 of 113 fishes in 18 families and 12 orders, trawled from deep north atlantic waters off the cape verde islands in 1999 and over the porcupine seabight in 2001 were found to harbour haematozoans. these included four species of haemogregarines (adeleorina, haemogregarinidae) and a species of trypanosome (trypanosomatina, trypanosomatidae) located in porcupine seabight fishes. also present were haemohormidium-like structures of uncertain status found in samples from th ... | 2012 | 22439421 |
| mechanism of deep-sea fish α-actin pressure tolerance investigated by molecular dynamics simulations. | the pressure tolerance of monomeric α-actin proteins from the deep-sea fish coryphaenoides armatus and c. yaquinae was compared to that of non-deep-sea fish c. acrolepis, carp, and rabbit/human/chicken actins using molecular dynamics simulations at 0.1 and 60 mpa. the amino acid sequences of actins are highly conserved across a variety of species. the actins from c. armatus and c. yaquinae have the specific substitutions q137k/v54a and q137k/l67p, respectively, relative to c. acrolepis, and are ... | 2014 | 24465747 |
| correlation of trimethylamine oxide and habitat depth within and among species of teleost fish: an analysis of causation. | most shallow-water teleosts have moderate levels of trimethylamine n-oxide (tmao; approximately 50 mmol/kg wet mass), a common osmolyte in many other marine animals. recently, muscle tmao contents were found to increase linearly with depth in six families. in one hypothesis, this may be an adaptation to counteract the deleterious effects of pressure on protein function, which tmao does in vitro. in another hypothesis, tmao may be accumulated as a by-product of acylglycerol (ag) production, incre ... | 2012 | 17252516 |
| pressure effects on the gtpase activity of brain membrane g proteins of deep-living marine fishes. | in marine fishes, heterotrimeric guanyl nucleotide binding proteins (g proteins), which couple cell surface membrane receptors to their effector elements, are sensitive to hydrostatic pressure. the intrinsic high affinity gtpase activity of the alpha subunits of g proteins in three signaling systems coupled to adenylyl cyclase, the a(1) adenosine receptor, the muscarinic cholinergic receptor and the beta-adrenergic receptor, was tested at pressures up to 340 atm. brain membrane preparations from ... | 2003 | 12892762 |
| a possible new control mechanism suggested by resonance raman spectra from a deep ocean fish hemoglobin. | the rattail fish, coryphaenoides armatus, lives at ocean depths of 3000 m. as an adaptation for pumping oxygen into the swim bladder against the extreme pressures at the ocean bottom, the hemoglobin from this fish at low ph exhibits an extraordinarily low affinity for ligands. in this study, continuous wave and time-resolved raman techniques are used to probe the binding site in this hemoglobin. the findings show an association between the low-affinity material and a highly strained heme-proxima ... | 1990 | 2285802 |
| temperature adaptation of fish hemoglobins reflected in rates of autoxidation. | observation of rapid autoxidation of oxyhemoglobin (hbo2) from a deep-sea fish (co-ryphaenoides acrolepis) prompted a survey of rates of autoxidation of hbo2 to methemoglobin in vitro from fishes inhabiting vastly different depths (1 to 3800 m) in order to discover any relationship between autoxidation rates and different environmental temperatures and pressures to which hemoglobins may be adapted. the rate of autoxidation was found to be sensitive to temperature in both deep- and shallow-living ... | 1987 | 3592663 |
| monooxygenase induction and chlorobiphenyls in the deep-sea fish coryphaenoides armatus. | inhibition of liver microsomal ethoxyresorufin o-deethylase and aryl hydrocarbon hydroxylase activities by alpha-naphthoflavone and by polyclonal antibodies to hydrocarbon-inducible cytochrome p-450e from teleost liver indicated a xenobiotic-induced origin of these activities in the deep-sea fish coryphaenoides armatus. specific recognition of a protein by antibodies to p-450e in an immunoblot assay further indicated xenobiotic-induced cytochrome p-450 in these animals. levels of apparently indu ... | 1986 | 17839567 |