Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA.
Department of Molecular and Cellular Biology, University of California, Davis, CA 95616, USA.
Science. 2014 Sep 12;345(6202):1312-7. doi: 10.1126/science.1256963. Epub 2014 Aug 21.
Cyanobacteria are unique among bacteria in performing oxygenic photosynthesis, often together with nitrogen fixation and, thus, are major primary producers in many ecosystems. The cyanobacterium, Leptolyngbya sp. strain JSC-1, exhibits an extensive photoacclimative response to growth in far-red light that includes the synthesis of chlorophylls d and f. During far-red acclimation, transcript levels increase more than twofold for ~900 genes and decrease by more than half for ~2000 genes. Core subunits of photosystem I, photosystem II, and phycobilisomes are replaced by proteins encoded in a 21-gene cluster that includes a knotless red/far-red phytochrome and two response regulators. This acclimative response enhances light harvesting for wavelengths complementary to the growth light (λ = 700 to 750 nanometers) and enhances oxygen evolution in far-red light.
蓝细菌在进行需氧光合作用方面在细菌中独一无二，通常与固氮作用一起，因此是许多生态系统中的主要初级生产者。蓝细菌 Leptolyngbya sp. 菌株 JSC-1 对远红光生长表现出广泛的光适应反应，包括叶绿素 d 和 f 的合成。在远红光驯化过程中，约 900 个基因的转录水平增加了两倍以上，约 2000 个基因的转录水平下降了一半以上。光系统 I、光系统 II 和藻胆体的核心亚基被 21 个基因簇编码的蛋白所取代，该基因簇包括无结红光/远红光光敏色素和两个响应调节蛋白。这种适应反应增强了对生长光（λ = 700 至 750 纳米）互补波长的光捕获，并增强了远红光中的氧气释放。
