3sle

Crystal Structure of the P107C-MauG/pre-Methylamine Dehydrogenase Complex

spinqualitylabelsall models 3sle, resolution 2.52Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3sle is a 6 chain structure with sequence from Paracoccus denitrificans PD1222. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.52Å Ligands: 0AF, ACT, CA, CSD, EDO, HEC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MAUG_PARDP Involved in methylamine metabolism. Essential for the maturation of the beta subunit of MADH, presumably via a step in the biosynthesis of tryptophan tryptophylquinone (TTQ), the cofactor of MADH. Publication Abstract from PubMed The diheme enzyme MauG catalyzes a six-electron oxidation required for posttranslational modification of a precursor of methylamine dehydrogenase (preMADH) to complete the biosynthesis of its protein-derived tryptophan tryptophylquinone (TTQ) cofactor. Crystallographic studies had shown that Pro107, which resides in the distal pocket of the high-spin heme of MauG, changes conformation upon binding of CO or NO to the heme iron. In this study, Pro107 was converted to Cys, Val, and Ser by site-directed mutagenesis. The structures of each of these MauG mutant proteins in complex with preMADH were determined, as were their physical and catalytic properties. P107C MauG was inactive, and the crystal structure revealed that Cys107 had been oxidatively modified to a sulfinic acid. Mass spectrometry revealed that this modification was present prior to crystallization. P107V MauG exhibited spectroscopic and catalytic properties that were similar to those of wild-type MauG, but P107V MauG was more susceptible to oxidative damage. The P107S mutation caused a structural change that resulted in the five-coordinate high-spin heme being converted to a six-coordinate heme with a distal axial ligand provided by Glu113. EPR and resonance Raman spectroscopy revealed this heme remained high-spin but with greatly increased rhombicity as compared to that of the axial signal of wild-type MauG. P107S MauG was resistant to reduction by dithionite and reaction with H(2)O(2) and unable to catalyze TTQ biosynthesis. These results show that the presence of Pro107 is critical in maintaining the proper structure of the distal heme pocket of the high-spin heme of MauG, allowing exogenous ligands to bind and directing the reactivity of the heme-activated oxygen during catalysis, thus minimizing the oxidation of other residues of MauG. Proline 107 is a major determinant in maintaining the structure of the distal pocket and reactivity of the high-spin heme of MauG.,Feng M, Jensen LM, Yukl ET, Wei X, Liu A, Wilmot CM, Davidson VL Biochemistry. 2012 Feb 28;51(8):1598-606. Epub 2012 Feb 10. PMID:22299652 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Methylamine dehydrogenase Methylamine utilisation protein Methylation utilization protein MauG

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