Download MendeleyStructure of Fumarate Reductase from Wolinella Succinogenes at 2.2 Angstroms Resolution
Lancaster, C.R.D., Kroeger, A., Auer, M., Michel, H.(1999) Nature 402: 377
- PubMed: 10586875 Search on PubMed
- DOI: https://doi.org/10.1038/46483
- Primary Citation Related Structures:
1QLB - PubMed Abstract:
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.
- Max-Planck-Institut für Biophysik, Frankfurt am Main, Germany. lancaster@mpibp-frankfurt.mpg.de
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