1rm6
From Proteopedia
Structure of 4-hydroxybenzoyl-CoA reductase from Thauera aromatica
Structural highlights
FunctionHCRA_THAAR Component of a complex that catalyzes the reductive dehydroxylation of 4-hydroxybenzoyl-CoA to benzoyl-CoA. Reaction is not reversible. Is a key enzyme in the anaerobic degradation of phenolic compounds.[1] 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 PubMedThe Mo-flavo-Fe/S-dependent heterohexameric protein complex 4-hydroxybenzoyl-CoA reductase (4-HBCR, dehydroxylating) is a central enzyme of the anaerobic degradation of phenolic compounds and belongs to the xanthine oxidase (XO) family of molybdenum enzymes. Its X-ray structure was established at 1.6 A resolution. The most pronounced difference between 4-HBCR and other structurally characterized members of the XO family is the insertion of 40 amino acids within the beta subunit, which carries an additional [4Fe-4S] cluster at a distance of 16.5 A to the isoalloxazine ring of FAD. The architecture of 4-HBCR and concomitantly performed electron transfer rate calculations suggest an inverted electron transfer chain from the donor ferredoxin via the [4Fe-4S] cluster to the Mo over a distance of 55 A. The binding site of 4-hydroxybenzoyl-CoA is located in an 18 A long channel lined up by several aromatic side chains around the aromatic moiety, which are proposed to shield and stabilize the postulated radical intermediates during catalysis. Structure of a xanthine oxidase-related 4-hydroxybenzoyl-CoA reductase with an additional [4Fe-4S] cluster and an inverted electron flow.,Unciuleac M, Warkentin E, Page CC, Boll M, Ermler U Structure. 2004 Dec;12(12):2249-56. PMID:15576037[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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