Allakhverdiev S I, Kreslavski V D, Zharmukhamedov S K, Voloshin R A, Korol'kova D V, Tomo T, Shen J-R
Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, 127276, Russia.
Biochemistry (Mosc). 2016 Mar;81(3):201-12. doi: 10.1134/S0006297916030020.
The finding of unique Chl d- and Chl f-containing cyanobacteria in the last decade was a discovery in the area of biology of oxygenic photosynthetic organisms. Chl b, Chl c, and Chl f are considered to be accessory pigments found in antennae systems of photosynthetic organisms. They absorb energy and transfer it to the photosynthetic reaction center (RC), but do not participate in electron transport by the photosynthetic electron transport chain. However, Chl d as well as Chl a can operate not only in the light-harvesting complex, but also in the photosynthetic RC. The long-wavelength (Qy) Chl d and Chl f absorption band is shifted to longer wavelength (to 750 nm) compared to Chl a, which suggests the possibility for oxygenic photosynthesis in this spectral range. Such expansion of the photosynthetically active light range is important for the survival of cyanobacteria when the intensity of light not exceeding 700 nm is attenuated due to absorption by Chl a and other pigments. At the same time, energy storage efficiency in photosystem 2 for cyanobacteria containing Chl d and Chl f is not lower than that of cyanobacteria containing Chl a. Despite great interest in these unique chlorophylls, many questions related to functioning of such pigments in primary photosynthetic processes are still not elucidated. This review describes the latest advances in the field of Chl d and Chl f research and their role in primary photosynthetic processes of cyanobacteria.
在过去十年中发现含有独特叶绿素d和叶绿素f的蓝细菌是产氧光合生物生物学领域的一项发现。叶绿素b、叶绿素c和叶绿素f被认为是光合生物天线系统中发现的辅助色素。它们吸收能量并将其转移到光合反应中心（RC），但不参与光合电子传递链的电子传递。然而，叶绿素d以及叶绿素a不仅可以在光捕获复合体中发挥作用，也可以在光合反应中心发挥作用。与叶绿素a相比，叶绿素d和叶绿素f的长波长（Qy）吸收带向更长波长（至750 nm）移动，这表明在该光谱范围内进行产氧光合作用的可能性。当不超过700 nm的光强度因叶绿素a和其他色素的吸收而减弱时，光合有效光范围的这种扩展对蓝细菌的生存很重要。同时，含有叶绿素d和叶绿素f的蓝细菌在光系统2中的能量存储效率不低于含有叶绿素a的蓝细菌。尽管对这些独特的叶绿素非常感兴趣，但与这些色素在初级光合过程中的功能相关的许多问题仍未阐明。本综述描述了叶绿素d和叶绿素f研究领域的最新进展及其在蓝细菌初级光合过程中的作用。
