Closing the gaps on the viral photosystem‐I psaDCAB gene organization
Identifieur interne : 001996 ( Main/Exploration ); précédent : 001995; suivant : 001997Closing the gaps on the viral photosystem‐I psaDCAB gene organization
Auteurs : Sheila Roitman [Israël] ; José Flores-Uribe [Israël] ; Alon Philosof [Israël] ; Ben Knowles [États-Unis] ; Forest Rohwer [États-Unis] ; J. Cesar Ignacio-Espinoza [États-Unis] ; Matthew B. Sullivan [États-Unis] ; Francisco M. Cornejo-Castillo [Espagne] ; Pablo Sánchez [Espagne] ; Silvia G. Acinas [Espagne] ; Chris L. Dupont [États-Unis] ; Oded Béjà [Israël]Source :
- Environmental Microbiology [ 1462-2912 ] ; 2015-12.
Abstract
Marine photosynthesis is largely driven by cyanobacteria, namely Synechococcus and Prochlorococcus. Genes encoding for photosystem (PS) I and II reaction centre proteins are found in cyanophages and are believed to increase their fitness. Two viral PSI gene arrangements are known, psaJF→C→A→B→K→E→D and psaD→C→A→B. The shared genes between these gene cassettes and their encoded proteins are distinguished by %G + C and protein sequence respectively. The data on the psaD→C→A→B gene organization were reported from only two partial gene cassettes coming from Global Ocean Sampling stations in the Pacific and Indian oceans. Now we have extended our search to 370 marine stations from six metagenomic projects. Genes corresponding to both PSI gene arrangements were detected in the Pacific, Indian and Atlantic oceans, confined to a strip along the equator (30°N and 30°S). In addition, we found that the predicted structure of the viral PsaA protein from the psaD→C→A→B organization contains a lumenal loop conserved in PsaA proteins from Synechococcus, but is completely absent in viral PsaA proteins from the psaJF→C→A→B→K→E→D gene organization and most Prochlorococcus strains. This may indicate a co‐evolutionary scenario where cyanophages containing either of these gene organizations infect cyanobacterial ecotypes biogeographically restricted to the 30°N and 30°S equatorial strip.
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DOI: 10.1111/1462-2920.13036
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Genes encoding for photosystem (PS) I and II reaction centre proteins are found in cyanophages and are believed to increase their fitness. Two viral PSI gene arrangements are known, psaJF→C→A→B→K→E→D and psaD→C→A→B. The shared genes between these gene cassettes and their encoded proteins are distinguished by %G + C and protein sequence respectively. The data on the psaD→C→A→B gene organization were reported from only two partial gene cassettes coming from Global Ocean Sampling stations in the Pacific and Indian oceans. Now we have extended our search to 370 marine stations from six metagenomic projects. Genes corresponding to both PSI gene arrangements were detected in the Pacific, Indian and Atlantic oceans, confined to a strip along the equator (30°N and 30°S). In addition, we found that the predicted structure of the viral PsaA protein from the psaD→C→A→B organization contains a lumenal loop conserved in PsaA proteins from Synechococcus, but is completely absent in viral PsaA proteins from the psaJF→C→A→B→K→E→D gene organization and most Prochlorococcus strains. This may indicate a co‐evolutionary scenario where cyanophages containing either of these gene organizations infect cyanobacterial ecotypes biogeographically restricted to the 30°N and 30°S equatorial strip.</div></front></TEI><affiliations><list><country><li>Espagne</li><li>Israël</li><li>États-Unis</li></country><region><li>Californie</li><li>Catalogne</li></region><settlement><li>Barcelone</li><li>San Diego</li></settlement></list><tree><country name="Israël"><noRegion><name sortKey="Roitman, Sheila" sort="Roitman, Sheila" uniqKey="Roitman S" first="Sheila" last="Roitman">Sheila Roitman</name></noRegion><name sortKey="Beja, Oded" sort="Beja, Oded" uniqKey="Beja O" first="Oded" last="Béjà">Oded Béjà</name><name sortKey="Beja, Oded" sort="Beja, Oded" uniqKey="Beja O" first="Oded" last="Béjà">Oded Béjà</name><name sortKey="Flores Ribe, Jose" sort="Flores Ribe, Jose" uniqKey="Flores Ribe J" first="José" last="Flores-Uribe">José Flores-Uribe</name><name sortKey="Philosof, Alon" sort="Philosof, Alon" uniqKey="Philosof A" first="Alon" last="Philosof">Alon Philosof</name></country><country name="États-Unis"><region name="Californie"><name sortKey="Knowles, Ben" sort="Knowles, Ben" uniqKey="Knowles B" first="Ben" last="Knowles">Ben Knowles</name></region><name sortKey="Dupont, Chris L" sort="Dupont, Chris L" uniqKey="Dupont C" first="Chris L." last="Dupont">Chris L. Dupont</name><name sortKey="Ignacio Spinoza, J Cesar" sort="Ignacio Spinoza, J Cesar" uniqKey="Ignacio Spinoza J" first="J. Cesar" last="Ignacio-Espinoza">J. Cesar Ignacio-Espinoza</name><name sortKey="Rohwer, Forest" sort="Rohwer, Forest" uniqKey="Rohwer F" first="Forest" last="Rohwer">Forest Rohwer</name><name sortKey="Sullivan, Matthew B" sort="Sullivan, Matthew B" uniqKey="Sullivan M" first="Matthew B." last="Sullivan">Matthew B. Sullivan</name><name sortKey="Sullivan, Matthew B" sort="Sullivan, Matthew B" uniqKey="Sullivan M" first="Matthew B." last="Sullivan">Matthew B. Sullivan</name></country><country name="Espagne"><region name="Catalogne"><name sortKey="Cornejo Astillo, Francisco M" sort="Cornejo Astillo, Francisco M" uniqKey="Cornejo Astillo F" first="Francisco M." last="Cornejo-Castillo">Francisco M. Cornejo-Castillo</name></region><name sortKey="Acinas, Silvia G" sort="Acinas, Silvia G" uniqKey="Acinas S" first="Silvia G." last="Acinas">Silvia G. Acinas</name><name sortKey="Sanchez, Pablo" sort="Sanchez, Pablo" uniqKey="Sanchez P" first="Pablo" last="Sánchez">Pablo Sánchez</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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