不放氧光合细菌的光合电子传递和固碳

The photosynthetic electron transport and carbon fixation in anoxygenic phototrophic bacteria

光合作用(photosynthesis)是地球上最重要的化学反应,为几乎所有的生命活动提供能量。与植物、藻类和蓝细菌等放氧光合生物不同,不放氧光合细菌(anoxygenic phototrophic bacteria,APB)以无机物和有机物作为电子供体进行不放氧的光合作用并固定CO_(2),在自然界碳、氮、硫等元素的代谢循环中发挥重要作用。与放氧光合生物相比,APB具有组成相对简单但多样化的原始光能合成系统,是研究光合作用起源、演化和分子机制的良好模式生物。本文总结APB光合作用的研究进展,概述其光合电子传递和固碳途径,探讨其光合系统在制备光生物电化学电池和合成高附加值化学品等方面的潜在应用。

Photosynthesis is the most important chemical reaction that supports almost all the life on Earth.Different from plants,algae and cyanobacteria that evolve oxygenic photosynthesis,anoxygenic phototrophic bacteria(APB)can use both organic and inorganic electron donors for light-dependent photosynthesis and carbon dioxide fixation without releasing oxygen,playing important roles in the metabolic cycling of multiple elements in nature,such as carbon,nitrogen and sulfur.Compared to oxygenic phototrophs,the APBs contain relatively simple but diversified primitive photosystems,serving as excellent model organisms to study the origin,evolution and molecular mechanisms of photosynthesis.This review summarizes research progress on the principles of APBs’photosynthesis,focusing on the photosynthetic electron transport and carbon fixation pathways,and their potential applications in constructing photo-bioelectrochemical cells and biosynthesis of high value-added chemicals.