REGULATORY FACTORS CONTROLLING PHOTOSYNTHETIC REACTION CENTER AND LIGHT-HARVESTING GENE-EXPRESSION IN RHODOBACTER-CAPSULATUS
REGULATORY FACTORS CONTROLLING PHOTOSYNTHETIC REACTION CENTER AND LIGHT-HARVESTING GENE-EXPRESSION IN RHODOBACTER-CAPSULATUS
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DOI：
10.1016/0092-8674(92)90037-d
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发表时间：
1992-03-06
期刊：
影响因子：
64.5
通讯作者：
BAUER, CE
中科院分区：
文献类型：
--
作者：
SGANGA, MW;BAUER, CE
大多数种类的光合细菌只有在氧张力降低的条件下才能合成它们的光合装置。这种现象在很大程度上取决于厌氧诱导光合作用基因的表达。在这里，我们报告了一个调控基因regA的例子，regA参与了光合机构厌氧表达的反激活。我们发现RegA本身负责光色素生物合成中与操纵子相关的光收集和反应中心基因表达的差异诱导。令人惊讶的是，被regA破坏的菌株在高光强下仍能保持正常的光合生长能力。我们进一步表明，在没有反激活结构基因表达的情况下，光合作用生长是光合作用基因簇超操作组织的结果。
Most species of photosynthetic bacteria synthesize their photosynthetic apparatus only under conditions of reduced oxygen tension. To a large extent, this phenomenon is dependent upon anaerobic induction of photosynthesis gene expression. Here we report an example of a regulatory gene, regA, that is involved in transactivating anaerobic expression of the photosynthetic apparatus. We show that RegA is itself responsible for differential induction of light-harvesting and reaction center gene expression relative to operons for photopigment biosynthesis. Surprisingly, strains disrupted for regA were found to retain normal photosynthetic growth capabilities under high light intensities. We further show that photosynthetic growth in the absence of transactivating structural gene expression is a consequence of the superoperonal organization of the photosynthetic gene cluster.