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1qlb
From Proteopedia
RESPIRATORY COMPLEX II-LIKE FUMARATE REDUCTASE FROM WOLINELLA SUCCINOGENES
Fumarate reductase couples the reduction of fumarate to succinate to the oxidation of quinol to quinone, in a reaction opposite to that catalysed by the related complex II of the respiratory chain (succinate dehydrogenase). Here we describe the crystal structure at 2.2 A resolution of the three protein subunits containing fumarate reductase from the anaerobic bacterium Wolinella succinogenes. Subunit A contains the site of fumarate reduction and a covalently bound flavin adenine dinucleotide prosthetic group. Subunit B contains three iron-sulphur centres. The menaquinol-oxidizing subunit C consists of five membrane-spanning, primarily helical segments and binds two haem b molecules. On the basis of the structure, we propose a pathway of electron transfer from the dihaem cytochrome b to the site of fumarate reduction and a mechanism of fumarate reduction. The relative orientations of the soluble and membrane-embedded subunits of succinate:quinone oxidoreductases appear to be unique.
Structure of fumarate reductase from Wolinella succinogenes at 2.2 A resolution., Lancaster CR, Kroger A, Auer M, Michel H, Nature. 1999 Nov 25;402(6760):377-85. PMID:10586875
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
About this Structure
1QLB is a 6 chains structure of sequences from Wolinella succinogenes. Full crystallographic information is available from OCA.
Reference
- Lancaster CR, Kroger A, Auer M, Michel H. Structure of fumarate reductase from Wolinella succinogenes at 2.2 A resolution. Nature. 1999 Nov 25;402(6760):377-85. PMID:10586875
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