The cytochrome b6f complex (plastoquinol/plastocyanin reductase or plastoquinol/plastocyanin oxidoreductase; EC 7.1.1.6) is an enzyme found in the thylakoid membrane in chloroplasts of plants, cyanobacteria, and green algae, that catalyzes the …

2021年5月1日 · Key features of Cyt b6f mitigate the formation of damaging reactive oxygen species and avoid short-circuits of the Q-cycle. Cyt b6f catalyses the rate-limiting step in linear electron transfer and is downregulated by ΔpH to protect PSI from damage.

该研究利用 冷冻电子显微镜 （cryo-EM）揭示了菠菜中细胞色素cyt b6f 二聚体复合物的3.6埃分辨率结构，揭示了Q循环及其氧化还原传感功能的结构基础。结构表明，菠菜cytb6 f复合体天然结合的PQ的位置，并提供了有关PQ与Qn位点结合，Qp位点的叶绿素门控以及Q循环 ...

This chapter presents an overview of structural properties of the cytochrome (Cyt) b 6 f complex and its functioning in chloroplasts. The Cyt b 6 f complex stands at the crossroad of photosynthetic electron transport pathways, providing connectivity between Photosystem (PSI) an …

In oxygenic photosynthetic systems, the cytochrome b6f (Cytb6f) complex (plastoquinol:plastocyanin oxidoreductase) is a heart of the hub that provides connectivity between photosystems (PS) II and I. In this review, the structure and function of the Cytb6f complex are briefly outlined, being focused on the mechanisms of a bifurcated (two ...

The cytochrome b6f complex (Cyt b6f) plays pivotal roles in both linear and cyclic electron transport of oxygenic photosynthesis in plants and cyanobacteria. The four large subunits of Cyt b6f are responsible for organizing the electron transfer chain within Cyt b6f and have their counterparts in the cytochrome bc1 complex in other bacteria.

2019年11月13日 · Here we present a 3.6 Å resolution cryo-electron microscopy (cryo-EM) structure of the dimeric cyt b6 f complex from spinach, which reveals the structural basis for operation of the Q cycle and...

光合作用通过 光合膜 上的光合复合物（ 光系统1 PSI、 光系统2 PSII、细胞色素b6f复合体Cytb6f、 ATP合成酶 等）间的电子传递，将光能转化为化学能。长期以来，人们对光合复合物的结构和功能进行了大量研究，获得了多种光合复合物单独的原子结构，对它们的 ...

2003年11月7日 · The cytochrome b 6 f complex provides the electronic connection between the photosystem I and photosystem II reaction centers of oxygenic photosynthesis and generates a transmembrane electrochemical proton gradient for adenosine triphosphate synthesis.

The structure and function of the cytochrome b6f complex is considered in the context of recent crystal structures of the complex as an eight subunit, 220 kDa symmetric dimeric complex obtained from the thermophilic cyanobacterium, Mastigocladus laminosus, and the green alga, Chlamydomonas reinhardt …