| characterization of a culturable alphaproteobacterial symbiont common to many marine sponges and evidence for vertical transmission via sponge larvae. | a closely related group of alphaproteobacteria were found to be present in seven genera of marine sponges from several locations and were shown to be transferred between sponge generations through the larvae in one of these sponges. isolates of the alphaproteobacterium were cultured from the sponges axinella corrugata, mycale laxissima, monanchora unguifera, and niphates digitalis from key largo, florida; didiscus oxeata and monanchora unguifera from discovery bay, jamaica; an acanthostronglyoph ... | 2006 | 16672523 |
| diversity and quorum-sensing signal production of proteobacteria associated with marine sponges. | marine sponges are hosts to diverse and dense bacterial communities and thus provide a potential environment for quorum sensing. quorum sensing, a key factor in cell-cell communication and bacterial colonization of higher animals, might be involved in the symbiotic interactions between bacteria and their sponge hosts. given that marine proteobacteria are known to produce n-acyl homoserine lactone (ahl) signal molecules, we tested the production of ahls by alpha- and gammaproteobacteria isolated ... | 2008 | 18211268 |
| diversity and expression of nitrogen fixation genes in bacterial symbionts of marine sponges. | marine sponges contain complex assemblages of bacterial symbionts, the roles of which remain largely unknown. we identified diverse bacterial nifh genes within sponges and found that nifh genes are expressed in sponges. this is the first demonstration of the expression of any protein-coding bacterial gene within a sponge. two sponges ircinia strobilina and mycale laxissima were collected from key largo, florida and had delta(15)n values of c. 0-1 per thousand and 3-4 per thousand respectively. t ... | 2008 | 18761667 |
| diversity of aerobic and anaerobic ammonia-oxidizing bacteria in marine sponges. | aerobic ammonia-oxidizing bacteria (aaob) are known to have an important function in the marine nitrogen cycle. anaerobic ammonium oxidation (anammox) carried out by some members of planctomycetales is also an important process in marine ecosystems. ammonia-monooxygenase gene (amoa) fragments were amplified to investigate the potential for nitrification and the diversity of the aaob in two marine sponges ircinia strobilina and mycale laxissima. all of the amoa sequences obtained from the two spo ... | 2010 | 19617876 |
| diversity and functional analysis of luxs genes in vibrios from marine sponges mycale laxissima and ircinia strobilina. | sponges harbor highly diverse and dense microbial communities, providing an environment in which bacterial signaling may be important. quorum sensing (qs) is a cell density-dependent signaling process that bacteria employ to coordinate and regulate their gene expression. previous studies have found that bacteria isolated from sponges are able to produce acyl-homoserine lactones (ahls), an important class of qs molecules found in proteobacteria. autoinducer-2 (ai-2) is a second class of qs molecu ... | 2011 | 21451585 |
| genome sequence of ruegeria sp. strain klh11, an n-acylhomoserine lactone-producing bacterium isolated from the marine sponge mycale laxissima. | ruegeria sp. strain klh11, isolated from the marine sponge mycale laxissima, produces a complex profile of n-acylhomoserine lactone quorum-sensing (qs) molecules. the genome sequence provides insights into the genetic potential of klh11 to maintain complex qs systems, and this is the first genome report of a cultivated symbiont from a marine sponge. | 2011 | 21742885 |
| [in vivo antiplasmodial activity of mycale laxissima and clathria echinata sponges]. | the search of new antimalarial compounds comprises, among its challenges, the development of therapeutic alternatives for cerebral malaria; due to the high mortality and neurological deficiencies that persist after treatment with recommended drugs. | 2012 | 23424801 |
| temporal changes in the diazotrophic bacterial communities associated with caribbean sponges ircinia stroblina and mycale laxissima. | sponges that harbor microalgal or, cyanobacterial symbionts may benefit from photosynthetically derived carbohydrates, which are rich in carbon but devoid of nitrogen, and may therefore encounter nitrogen limitation. diazotrophic communities associated with two caribbean sponges, ircinia strobilina and mycale laxissima were studied in a time series during which three individuals of each sponge were collected in four time points (5:00 am, 12:00 noon, 5:00 pm, 10:00 pm). nifh genes were successful ... | 2014 | 25389420 |
| a complex luxr-luxi type quorum sensing network in a roseobacterial marine sponge symbiont activates flagellar motility and inhibits biofilm formation. | bacteria isolated from marine sponges, including the silicibacter-ruegeria (sr) subgroup of the roseobacter clade, produce n-acylhomoserine lactone (ahl) quorum sensing signal molecules. this study is the first detailed analysis of ahl quorum sensing in sponge-associated bacteria, specifically ruegeria sp. klh11, from the sponge mycale laxissima. two pairs of luxr and luxi homologues and one solo luxi homologue were identified and designated ssari, ssbri and ssci (sponge-associated symbiont locu ... | 2012 | 22742196 |
| in vitro antiplasmodial activity, cytotoxicity and chemical profiles of sponge species of cuban coasts. | aqueous and organic fractions from the crude extracts of 17 sponge species collected at boca de calderas, havana, cuba were analysed. the organic fractions of mycale laxissima, clathria echinata and agelas cerebrum exhibited values of concentrations causing 50% inhibition of in vitro growth of plasmodium berghei (ic50) of 42.3 ± 5.1, 52 ± 9.7 and 60.3 ± 10.6 μg/ml, respectively, while their selectivity indexes for fibroblast cell lines were 9.45, 4.24 and 8.7, correspondingly. these fractions re ... | 2014 | 24304347 |