2mad

THE ACTIVE SITE STRUCTURE OF METHYLAMINE DEHYDROGENASE: HYDRAZINES IDENTIFY C6 AS THE REACTIVE SITE OF THE TRYPTOPHAN DERIVED QUINONE COFACTOR

spinqualitylabelsall models 2mad, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2mad is a 2 chain structure with sequence from Atcc 25364. This structure supersedes the now removed PDB entry 1mad. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: TRQ Activity: Methylamine dehydrogenase (amicyanin), with EC number 1.4.9.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [DHML_PARVE] Methylamine dehydrogenase carries out the oxidation of methylamine. Electrons are passed from methylamine dehydrogenase to amicyanin. [DHMH_PARVE] Methylamine dehydrogenase carries out the oxidation of methylamine. Electrons are passed from methylamine dehydrogenase to amicyanin. 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 PubMed To identify the reactive part of the orthoquinone function of the tryptophan-derived cofactor found in methylamine dehydrogenase (MADH), we have determined the crystal structures of MADH from Thiobacillus versutus inhibited by methylhydrazine and (2,2,2-trifluoroethyl)hydrazine. Extra electron density attached to C6 of the tryptophyl tryptophanquinone cofactor shows that this atom and not C7 is the reactive part of the ortho-quinone moiety. The density retained after hydrazine inhibition is much less extensive than expected, however, suggesting that partial breakdown of the inhibitors after reaction with the cofactor may take place. A detailed description is presented of the cofactor environment in an improved model of MADH which now includes information from the recently determined gene sequence of the cofactor-containing subunit [Ubbink, M., van Kleef, M.A.G., Kleinjan, D., Hoitink, C.W.G., Huitema, F., Beintema, J.J., Duine, J.A., & Canters, G.W. (1991) Eur. J. Biochem. 202, 1003-1012]. We hypothesize that Asp76 is responsible for proton abstraction from the alpha-carbon of the substrate during catalysis. Active site structure of methylamine dehydrogenase: hydrazines identify C6 as the reactive site of the tryptophan-derived quinone cofactor.,Huizinga EG, van Zanten BA, Duine JA, Jongejan JA, Huitema F, Wilson KS, Hol WG Biochemistry. 1992 Oct 13;31(40):9789-95. PMID:1390754 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Methylamine dehydrogenase

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