1VF5: Crystal Structure Of Cytochrome B6f Complex From M.Laminosus

Citation:
Abstract
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 bc1 complex, 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.
PDB ID: 1VF5Download
MMDB ID: 27534
PDB Deposition Date: 2004/4/8
Updated in MMDB: 2012/10
Experimental Method:
x-ray diffraction
Resolution: 3  Å
Source Organism:
Similar Structures:
Biological Unit for 1VF5: hexadecameric; determined by author and by software (PISA)
Molecular Components in 1VF5
Label Count Molecule
Proteins (16 molecules)
2
Cytochrome B6
Molecule annotation
2
Subunit IV
Molecule annotation
2
Cytochrome F
Molecule annotation
2
Rieske Iron-sulfur Protein
Molecule annotation
2
Protein PET L
Molecule annotation
2
Protein PET M
Molecule annotation
2
Protein PET G
Molecule annotation
2
Protein PET N
Molecule annotation
Chemicals (22 molecules)
1
8
2
2
3
2
4
4
5
2
6
2
7
2
* Click molecule labels to explore molecular sequence information.

Citing MMDB
.