1d4c
CRYSTAL STRUCTURE OF THE UNCOMPLEXED FORM OF THE FLAVOCYTOCHROME C FUMARATE REDUCTASE OF SHEWANELLA PUTREFACIENS STRAIN MR-1
Structural highlights
FunctionFCCA_SHEON Flavocytochrome that catalyzes the reduction of fumarate to succinate (PubMed:12196158, PubMed:12899636, PubMed:22458729). Is essential for fumarate respiration during anaerobic growth, acting as the terminal reductase (By similarity). Receives electrons from the membrane-bound tetraheme c-type cytochrome CymA (PubMed:12196158, PubMed:12899636, PubMed:19837833, PubMed:22458729). Under ferric iron-reducing conditions, can be part of an electron transport chain to ferric iron, by accepting electrons from CymA and transfering them to the c-type cytochrome MtrA (PubMed:19837833). Also plays an important role in the reduction of selenite to elemental selenium (PubMed:24435070). May act as a transient electron storage protein (PubMed:19837833).[UniProtKB:Q07WU7][1] [2] [3] [4] [5] 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 PubMedFumarate respiration is one of the most widespread types of anaerobic respiration. The soluble fumarate reductase of Shewanella putrefaciens MR-1 is a periplasmic tetraheme flavocytochrome c. The crystal structures of the enzyme were solved to 2.9 A for the uncomplexed form and to 2.8 A and 2.5 A for the fumarate and the succinate-bound protein, respectively. The structures reveal a flexible capping domain linked to the FAD-binding domain. A catalytic mechanism for fumarate reduction based on the structure of the complexed protein is proposed. The mechanism for the reverse reaction is a model for the homologous succinate dehydrogenase (complex II) of the respiratory chain. In flavocytochrome c fumarate reductase, all redox centers are in van der Waals contact with one another, thus providing an efficient conduit of electrons from the hemes via the FAD to fumarate. Structure and mechanism of the flavocytochrome c fumarate reductase of Shewanella putrefaciens MR-1.,Leys D, Tsapin AS, Nealson KH, Meyer TE, Cusanovich MA, Van Beeumen JJ Nat Struct Biol. 1999 Dec;6(12):1113-7. PMID:10581551[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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