3pxw

Crystal Structure of Ferrous NO Adduct of MauG in Complex with Pre-Methylamine Dehydrogenase

spinqualitylabelsall models 3pxw, resolution 2.11Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3pxw is a 6 chain structure with sequence from Pardp. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, CA, EDO, HEC, NA, NO, PG6, PGE NonStd Res: 0AF Related: 3l4m, 3l4o, 3orv, 3pxs, 3pxt Activity: Methylamine dehydrogenase (amicyanin), with EC number 1.4.9.1 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. [DHML_PARDE] Methylamine dehydrogenase carries out the oxidation of methylamine. Electrons are passed from methylamine dehydrogenase to amicyanin. Publication Abstract from PubMed MauG is a diheme enzyme responsible for the post-translational formation of the catalytic tryptophan tryptophylquinone (TTQ) cofactor in methylamine dehydrogenase (MADH). MauG can utilize hydrogen peroxide, or molecular oxygen and reducing equivalents, to complete this reaction via a catalytic bis-Fe(IV) intermediate. Crystal structures of diferrous, Fe(II)-CO, and Fe(II)-NO forms of MauG in complex with its preMADH substrate have been determined and compared to one another as well as to the structure of the resting diferric MauG-preMADH complex. CO and NO each bind exclusively to the 5-coordinate high-spin heme with no change in ligation of the 6-coordinate low-spin heme. These structures reveal likely roles for amino acid residues in the distal pocket of the high-spin heme in oxygen binding and activation. Glu113 is implicated in the protonation of heme-bound diatomic oxygen intermediates in promoting cleavage of the O-O bond. Pro107 is shown to change conformation on the binding of each ligand and may play a steric role in oxygen activation by positioning the distal oxygen near Glu113. Gln103 is in a position to provide a hydrogen bond to the Fe(IV) horizontal lineO moiety that may account for the unusual stability of this species in MauG. Crystal Structures of CO and NO Adducts of MauG in Complex with Pre-Methylamine Dehydrogenase: Implications for the Mechanism of Dioxygen Activation.,Yukl ET, Goblirsch BR, Davidson VL, Wilmot CM Biochemistry. 2011 Mar 16. PMID:21355604 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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