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1rfs

From Proteopedia

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{{STRUCTURE_1rfs| PDB=1rfs | SCENE= }}
{{STRUCTURE_1rfs| PDB=1rfs | SCENE= }}
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'''RIESKE SOLUBLE FRAGMENT FROM SPINACH'''
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===RIESKE SOLUBLE FRAGMENT FROM SPINACH===
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==Overview==
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BACKGROUND: The cytochrome b6f complex functions in oxygenic photosynthesis as an integral membrane protein complex that mediates coupled electron transfer and proton translocation. The Rieske [2Fe-2S] protein subunit of the complex functions at the electropositive (p) membrane interface as the electron acceptor for plastoquinol and donor for the cytochrome f subunit, and may have a dynamic role in catalyzing electron and proton transfer at the membrane interface. There are significant structure/function similarities to the cytochrome bc1 complex of the respiratory chain. RESULTS: The 1.83 A crystal structure of a 139-residue C-terminal fragment of the Rieske [2Fe-2S] protein, derived from the cytochrome b6f complex of spinach chloroplasts, has been solved by multiwavelength anomalous diffraction. The structure of the fragment comprises two domains: a small 'cluster-binding' subdomain and a large subdomain. The [2Fe-2S] cluster-binding subdomains of the chloroplast and mitochondrial Rieske proteins are virtually identical, whereas the large subdomains are strikingly different despite a common folding topology. A structure-based sequence alignment of the b6f and bc1 groups of Rieske soluble domains is presented. CONCLUSIONS: The segregation of structural conservation and divergence in the cluster-binding and large subdomains of the Rieske protein correlates with the overall relatedness of the cytochrome b6f and bc1 complexes, in which redox domains in the aqueous p phase are dissimilar and those within the membrane are similar. Distinct sequences and surface charge distributions among Rieske large subdomains may provide a signature for interaction with the p-side oxidant protein and for the pH of the intraorganelle compartment.
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(as it appears on PubMed at http://www.pubmed.gov), where 9438861 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9438861}}
==About this Structure==
==About this Structure==
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[[Category: Electron transport]]
[[Category: Electron transport]]
[[Category: Iron-sulfur protein]]
[[Category: Iron-sulfur protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 14:17:08 2008''

Revision as of 11:17, 29 July 2008

Image:1rfs.png

Template:STRUCTURE 1rfs

RIESKE SOLUBLE FRAGMENT FROM SPINACH

Template:ABSTRACT PUBMED 9438861

About this Structure

1RFS is a Single protein structure of sequence from Spinacia oleracea. Full crystallographic information is available from OCA.

Reference

Biological identity and diversity in photosynthesis and respiration: structure of the lumen-side domain of the chloroplast Rieske protein., Carrell CJ, Zhang H, Cramer WA, Smith JL, Structure. 1997 Dec 15;5(12):1613-25. PMID:9438861

Page seeded by OCA on Tue Jul 29 14:17:08 2008

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