Faculty of Biology, Lorry I. Lokey Interdisciplinary Center for Life Sciences and Engineering, Technion-Israel Institute of Technology, Haifa, Israel.
ISME J. 2012 Aug;6(8):1617-20. doi: 10.1038/ismej.2012.23. Epub 2012 Mar 29.
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.
蓝藻在海洋光合作用中起着关键作用，这有助于全球碳循环和世界氧气供应。编码光合系统-II（PSII）和光合系统-I（PSI）反应中心的基因存在于不同的噬藻体基因组中，有人提出这些基因的水平转移可能参与了提高噬菌体的适应性。我们进一步分析了一个罕见的病毒全球海洋取样（GOS）克隆，其中包含PSI 基因。该克隆包含不常见的 PSI 基因组织 psaD->C->A，而不是更常见的病毒 psaJF->C->A->B->K->E->D 组织，并且仅在 GOS 宏基因组中检测到一次。我们的分析确定了更多具有相似排列的发生情况，并表明这种 PSI 病毒基因组织（现在是 psaD->C->A->B）虽然罕见，但却是真实存在的，代表了一种新的 PSI 基因排列。
