2d2c

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Crystal Structure Of Cytochrome B6F Complex with DBMIB From M. Laminosus

Structural highlights

2d2c is a 16 chain structure with sequence from Mastigocladus laminosus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 3.8Å
Ligands:BCR, BNT, CLA, FES, HEC, HEM, OPC
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CYF_MASLA Component of the cytochrome b6-f complex, which mediates electron transfer between photosystem II (PSII) and photosystem I (PSI), cyclic electron flow around PSI, and state transitions.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Details are presented of the structural analysis of the cytochrome b(6)f complex from the thermophilic cyanobacterium, Mastigocladus laminosus, in the presence of the electrochemically positive (p)-side quinone analogue inhibitor, 2,5-dibromo-3-methyl-6-isopropylbenzoquinone (DBMIB). One DBMIB binding site was found. This site is peripheral to the quinone binding space defined by the binding sites of other p-side inhibitors previously resolved in cytochrome bc(1)/b(6)f complexes. This high-affinity site resides in a p-side interfacial niche bounded by cytochrome f, subunit IV, and cytochrome b(6), is close (8 A) to the p-side heme b, but distant (19 A) from the [2Fe-2S] cluster. No significant electron density associated with the DBMIB was found elsewhere in the structure. However, the site at which DBMIB can inhibit light-induced redox turnover is within a few A of the [2Fe-2S] cluster, as shown by the absence of inhibition in mutants of Synechococcus sp. PCC 7002 at iron sulfur protein-Leu-111 near the cluster. The ability of a minimum amount of initially oxidized DBMIB to inhibit turnover of WT complex after a second light flash implies that there is a light-activated movement of DBMIB from the distal peripheral site to an inhibitory site proximal to the [2Fe-2S] cluster. Together with the necessary passage of quinone/quinol through the small Q(p) portal in the complex, it is seen that transmembrane traffic of quinone-like molecules through the core of cytochrome bc complexes can be labyrinthine.

Intraprotein transfer of the quinone analogue inhibitor 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone in the cytochrome b6f complex.,Yan J, Kurisu G, Cramer WA Proc Natl Acad Sci U S A. 2006 Jan 3;103(1):69-74. Epub 2005 Dec 21. PMID:16371475[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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See Also

References

  1. Yan J, Kurisu G, Cramer WA. Intraprotein transfer of the quinone analogue inhibitor 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone in the cytochrome b6f complex. Proc Natl Acad Sci U S A. 2006 Jan 3;103(1):69-74. Epub 2005 Dec 21. PMID:16371475 doi:http://dx.doi.org/10.1073/pnas.0504909102

Contents


PDB ID 2d2c

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