Elsen Sylvie, Jaubert Marianne, Pignol David, Giraud Eric
Laboratoire de Biochimie et Biophysique des Systèmes Intégrés (UMR 5092 CNRS-CEA-UJF), CEA-Grenoble, 38054 Grenoble Cedex 9, France.
Mol Microbiol. 2005 Jul;57(1):17-26. doi: 10.1111/j.1365-2958.2005.04655.x.
Purple bacteria control the level of expression and the composition of their photosystem according to light and redox conditions. This control involves several regulatory systems that have been now well characterized. Among them, the PpsR regulator plays a central role, because it directly or indirectly controls the synthesis of all of the different components of the photosystem. In this review, we report our knowledge of the PpsR protein, highlighting the diversity of its mode of action and focusing on the proteins identified in four model purple bacteria (Rhodobacter capsulatus, Rhodobacter sphaeroides, Rubrivivax gelatinosus, Bradyrhizobium ORS278). This regulator exhibits unique regulatory features in each bacterium: it can activate and/or repress the expression of photosynthesis genes, its activity can be modulated or not by the redox conditions, it can interact with other specific regulators and therefore be involved differently in light and/or redox regulatory circuits.
紫色细菌根据光照和氧化还原条件控制其光系统的表达水平和组成。这种控制涉及几个现已得到充分表征的调节系统。其中，PpsR调节因子起着核心作用，因为它直接或间接控制光系统所有不同组分的合成。在这篇综述中，我们报告了我们对PpsR蛋白的了解，强调了其作用模式的多样性，并聚焦于在四种模式紫色细菌（荚膜红细菌、球形红细菌、嗜胶红长命菌、慢生根瘤菌ORS278）中鉴定出的蛋白质。这种调节因子在每种细菌中都表现出独特的调节特征：它可以激活和/或抑制光合作用基因的表达，其活性可以被氧化还原条件调节或不被调节，它可以与其他特定调节因子相互作用，因此以不同方式参与光照和/或氧化还原调节回路。
