title: Viral clones from the GOS expedition with an unusual photosystem-I gene cassette organization.
abstract: Cyanobacteria have a key role in marine photosynthesis, which contributes to the global carbon cycle and to the world oxygen supply. Genes encoding for photosystem-II (PSII) and photosystem-I (PSI) reaction centers are found in different cyanophage genomes, and it was suggested that the horizontal transfer of these genes might be involved in increasing phage fitness. We have further analyzed a rare viral Global Ocean Sampling (GOS) clone containing PSI genes. This clone contains the unusual PSI gene organization psaD->C->A, as opposed to the more frequently observed viral psaJF->C->A->B->K->E->D organization, and was detected only once in the GOS metagenome. Our analyses identified more occurrences with similar arrangement and indicate that this PSI viral gene organization (now psaD->C->A->B), although rare, is authentic and represents a new PSI gene arrangement.
authors.affiliation: Faculty of Biology, Lorry I. Lokey Interdisciplinary Center for Life Sciences and Engineering, Technion-Israel Institute of Technology, Haifa, Israel. beja@tx.technion.ac.il
authors.forename: Oded
authors.initials: O
authors.lastname: Béjà
authors.forename: Svetlana
authors.initials: S
authors.lastname: Fridman
authors.forename: Fabian
authors.initials: F
authors.lastname: Glaser
mesh_terms: D001435:Bacteriophages / Q000145:classification / Q000235:genetics*; D000458:Cyanobacteria / Q000145:classification / Q000235:genetics*; D005101:Expeditions; D023061:Gene Order; D005814:Genes, Viral / Q000235:genetics*; D054892:Metagenome / Q000235:genetics; D009792:Oceans and Seas; D045331:Photosystem I Protein Complex / Q000235:genetics*; D010802:Phylogeny; D014871:Water Microbiology
chemical_list: D045331:Photosystem I Protein Complex