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首页> 外文期刊>Environmental microbiology >Reconstructing a puzzle: Existence of cyanophages containing both photosystem-I and photosystem-II gene suites inferred from oceanic metagenomic datasets
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Reconstructing a puzzle: Existence of cyanophages containing both photosystem-I and photosystem-II gene suites inferred from oceanic metagenomic datasets

机译：重建一个难题：从海洋宏基因组数据集推断出同时包含光系统I和光系统II基因套件的蓝噬菌的存在

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摘要

Cyanobacteria play a key role in marine photosynthesis, which contributes to the global carbon cycle and to the world oxygen supply. Genes encoding the photosystem-II (PSII) reaction centre are found in many cyanophage genomes, and it was suggested that the horizontal transfer of these genes might be involved in increasing phage fitness. Recently, evidence for the existence of phages carrying Photosystem-I (PSI) genes was also reported. Here, using a combination of different marine metagenomic datasets and a unique crossing of the datasets, we now describe the finding of phages that, as in plants and cyanobacteria, contain both PSII and PSI genes. In addition, these phages also contain NADH dehydrogenase genes. The presence of modified PSII and PSI genes in the same viral entities in combination with electron transfer proteins like NAD(P)H dehydrogenase (NDH-1) strongly points to a role in perturbation of the cyanobacterial host photosynthetic electron flow. We therefore suggest that, depending on the physiological condition of the infected cyanobacterial host, the viruses may use different options to maximize survival. The modified PSI may alternate between functioning with PSII in linear electron transfer and contributing to the production of both NADPH and ATP or functioning independently of PSII in cyclic mode via the NDH-1 complex and thus producing only ATP.
机译：蓝细菌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。在许多蓝藻基因组中发现了编码光系统II（PSII）反应中心的基因，这表明这些基因的水平转移可能与提高噬菌体适应性有关。最近，也报道了携带光系统I（PSI）基因的噬菌体存在的证据。在这里，结合不同海洋宏基因组学数据集和数据集的独特交叉，我们现在描述发现噬菌体，如在植物和蓝细菌中，它们同时包含PSII和PSI基因。另外，这些噬菌体还含有NADH脱氢酶基因。修饰的PSII和PSI基因与电子转移蛋白（如NAD（P）H脱氢酶（NDH-1））结合存在于同一病毒实体中，强烈指出了在扰动蓝细菌宿主光合电子流中的作用。因此，我们建议，根据感染的蓝细菌宿主的生理状况，病毒可能会使用不同的方法来最大化生存期。修饰的PSI可以在线性电子传递中与PSII起作用并有助于NADPH和ATP的产生之间或者经由NDH-1复合物以循环模式独立于PSII起作用之间交替，从而仅产生ATP。

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