光系统I基因盒存在于海洋病毒基因组中
Itai Sharon1,2, Ariella Alperovitch1, Forest Rohwer3,4
1Faculty of Biology, Technion - Israel Institute of Technology, Haifa 32000, Israel.
Nature
|August 28, 2009
概括
海洋青菌拥有光系统I (PSI) 基因,这可能使病毒能够利用宿主光合作用来进行自身复制和在海洋中生存. 这一发现扩大了我们对海洋生态系统中病毒策略的理解.
科学领域:
- 海洋生物学 海洋生物学
- 病毒学 病毒学
- 光合作用研究研究光合作用.
背景情况:
- 海洋蓝藻细菌,如Synechococcus和Prochlorococcus,是海洋的主要初级生产者.
- 此前已经发现蓝菌 (感染蓝菌的病毒) 携带光系统II (PSII) 基因.
- 病毒PSII基因被假设通过补充宿主蛋白质生产来增强病毒健康.
研究的目的:
- 调查光系统I (PSI) 基因在海洋青动物基因组中的存在和潜在功能.
- 为了确定病毒PSI基因是否在病毒生命周期内有组织和潜在的功能.
主要方法:
- 从全球海洋采样探险和病毒生物群中分析了先前存在的元基因组数据.
- 通过对环境DNA的重叠和长聚合酶链反应确认PSI基因集群的存在.
- 病毒的生物信息分析和投影到蓝藻PSI晶体结构上.
主要成果:
- 在食者基因组中发现了七个核心的蓝藻细菌PSI基因 (psaA,B,C,D,E,K和一个独特的J/F融合).
- 这些基因在蓝虫基因组中形成一个独特的集群,表明它们具有协调的功能.
- 已识别的病毒PSI基因可能编码了一个完整的,功能性的单体PSI复合体.
- 结构分析表明病毒PSI可能会将电子流转向光系统.
结论:
- 海洋蓝虫携带光系统I (PSI) 的基因,除了之前识别的PSII基因.
- 病毒PSI基因的存在表明病毒操纵宿主光合作用的一种新机制.
- 这一发现对了解病毒对海洋初级生产力和宿主病毒系统内的能量转移的影响有意义.
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