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首页> 外文期刊>Applied Microbiology >Dynamics of Photosynthesis in a Glycogen-Deficient glgC Mutant of Synechococcus sp. Strain PCC 7002
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Dynamics of Photosynthesis in a Glycogen-Deficient glgC Mutant of Synechococcus sp. Strain PCC 7002

机译：糖原缺乏的gygC突变体Syechococcus sp。的光合作用动力学。应变PCC 7002

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Cyanobacterial glycogen-deficient mutants display impaired degradation of light-harvesting phycobilisomes under nitrogen-limiting growth conditions and secrete a suite of organic acids as a putative reductant-spilling mechanism. This genetic background, therefore, represents an important platform to better understand the complex relationships between light harvesting, photosynthetic electron transport, carbon fixation, and carbonitrogen metabolisms. In this study, we conducted a comprehensive analysis of the dynamics of photosynthesis as a function of reductant sink manipulation in a glycogen-deficient glgC mutant of Synechococcus sp. strain PCC 7002. The glgC mutant showed increased susceptibility to photoinhibition during the initial phase of nitrogen deprivation. However, after extended periods of nitrogen deprivation, glgC mutant cells maintained higher levels of photosynthetic activity than the wild type, supporting continuous organic acid secretion in the absence of biomass accumulation. In contrast to the wild type, the glgC mutant maintained efficient energy transfer from phycobilisomes to photosystem II (PSII) reaction centers, had an elevated PSII/PSI ratio as a result of reduced PSII degradation, and retained a nitrogen-replete-type ultrastructure, including an extensive thylakoid membrane network, after prolonged nitrogen deprivation. Together, these results suggest that multiple global signals for nitrogen deprivation are not activated in the glgC mutant, allowing the maintenance of active photosynthetic complexes under conditions where photosynthesis would normally be abolished.
机译：蓝藻糖原缺陷型突变体在限制氮的生长条件下显示出光捕获性藻胆体的降解受损，并分泌一套有机酸作为假定的还原剂溢出机制。因此，这种遗传背景代表了一个重要的平台，可以更好地了解光收集，光合作用电子传输，碳固定和碳/氮代谢之间的复杂关系。在这项研究中，我们进行了光合作用的动力学的综合分析，该动力学是Synochococcus sp糖原缺陷型glgC突变体中还原剂池操纵的功能。菌株PCC7002。glgC突变体在氮剥夺的初始阶段显示出对光抑制的敏感性增加。但是，经过长时间的氮剥夺后，glgC突变型细胞比野生型细胞保持更高水平的光合作用活性，从而在没有生物质积累的情况下支持连续的有机酸分泌。与野生型相反，glgC突变体维持了从藻胆体到光系统II（PSII）反应中心的有效能量转移，由于降低了PSII的降解而提高了PSII / PSI的比例，并保留了富氮型超微结构，长期缺乏氮后，包括广泛的类囊体膜网络。在一起，这些结果表明在glgC突变体中没有激活多个全局的氮剥夺信号，从而可以在通常取消光合作用的条件下维持活性光合复合物。

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