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首页> 外文期刊>Journal of bacteriology >Transcriptional and Translational Regulation of Photosystem I and II Genes in Light-Dark- and Continuous-Light-Grown Cultures of the Unicellular Cyanobacterium Cyanothece sp. Strain ATCC 51142
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Transcriptional and Translational Regulation of Photosystem I and II Genes in Light-Dark- and Continuous-Light-Grown Cultures of the Unicellular Cyanobacterium Cyanothece sp. Strain ATCC 51142

机译：单细胞蓝藻蓝藻的光暗和连续光培养中光系统I和II基因的转录和翻译调控。应变ATCC 51142

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摘要

Cyanothece sp. strain ATCC 51142, a unicellular, diazotrophic cyanobacterium, demonstrated extensive metabolic periodicities of photosynthesis, respiration, and nitrogen fixation when grown under N2-fixing conditions. This report describes the relationship of the biosynthesis of photosynthesis genes to changes in the oligomerization state of the photosystems. Transcripts of the psbA gene family, encoding the photosystem II (PSII) reaction center protein D1, accumulated primarily during the light period, and net transcription reached a peak between 2 to 6 h in the light in light-dark (LD) growth and between 4 to 10 h in the subjective light when grown under continuous light (LL). The relative amount of the D1 protein (form 1 versus form 2) appeared to change during this diurnal cycle, along with changes in the PSII monomer/dimer ratio. D1 form 1 accumulated at approximately equal levels throughout the 24-h cycle, whereas D1 form 2 accumulated at significantly higher levels at approximately 8 to 10 h in the light or subjective light. The psbD gene, encoding the reaction center protein D2, also demonstrated differences between the two copies of this gene, with one copy transcribed more heavily around 6 to 8 h in the light. Accumulation of the PSI reaction center proteins PsaA and PsaB was maximal in the dark or subjective-dark periods, a period during which PSI was primarily in the trimeric form. We conclude that photosystem organization changes during the diurnal cycle to favor either noncyclic electron flow, which leads to O2 evolution and CO2 fixation, or cyclic electron flow, which favors ATP synthesis.
机译：蓝藻类 sp。在N 2 固定条件下生长的单细胞重氮营养蓝细菌ATCC 51142表现出广泛的光合作用，呼吸作用和固氮代谢周期。该报告描述了光合作用基因的生物合成与光系统低聚状态变化之间的关系。 psbA 基因家族的转录本，编码光系统II（PSII）反应中心蛋白D1，主要在光照期间积累，净转录在光照下2至6小时达到峰值，在连续光照（LL）下生长时，在主观光照下黑暗（LD）生长和4至10小时之间。在此昼夜周期中，D1蛋白的相对量（形式1与形式2）似乎发生了变化，并且PSII单体/二聚体比率也发生了变化。在整个24小时周期中，D1形式1积累的水平大致相等，而在光照或主观光下，D1形式2的积累水平大约在8至10 h显着较高。编码反应中心蛋白D2的s> psbD 基因也显示出该基因的两个拷贝之间的差异，其中一个拷贝在光照下约6至8 h转录得更多。在黑暗或主观黑暗时期，PSI反应中心蛋白PsaA和PsaB的积累最大，在此期间PSI主要为三聚体形式。我们得出的结论是，光系统的组织在昼夜周期中发生变化，从而有利于非循环电子流（这会导致O 2 演化和CO 2 固着）或循环电子流（这会有利于ATP）合成。

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