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Structure of the Cytochrome b₆f Complex of Oxygenic Photosynthesis: Tuning the Cavity
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Structure of the Cytochrome b₆f Complex of Oxygenic Photosynthesis: Tuning the Cavity
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Journal Article
Structure of the Cytochrome b₆f Complex of Oxygenic Photosynthesis: Tuning the Cavity
2003
Overview
The cytochrome b6f 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. A 3.0 angstrom crystal structure of the dimeric b6f complex from the thermophilic cyanobacterium Mastigocladus laminosus reveals a large quinone exchange cavity, stabilized by lipid, in which plastoquinone, a quinone-analog inhibitor, and a novel heme are bound. The core of the b6f complex is similar to the analogous respiratory cytochrome bc1complex, but the domain arrangement outside the core and the complement of prosthetic groups are strikingly different. The motion of the Rieske iron-sulfur protein extrinsic domain, essential for electron transfer, must also be different in the b6f complex.
Publisher
American Association for the Advancement of Science
Subject
Biological and medical sciences
/ Chromium
/ Cytochrome b6f Complex - chemistry
/ Cytochrome b6f Complex - metabolism
/ Electron Transport Complex III - chemistry
/ Electron Transport Complex III - metabolism
/ Fundamental and applied biological sciences. Psychology
/ Hydrophobic and Hydrophilic Interactions
/ Iron-Sulfur Proteins - chemistry
/ Iron-Sulfur Proteins - metabolism
/ Lipids
/ Monomers
/ Protein Structure, Quaternary
/ Protein Structure, Secondary
/ Protein Subunits - chemistry
/ Protons
/ Quinones
