3lsm

Pyranose 2-oxidase H167A mutant with flavin N(5) sulfite adduct

spinqualitylabelsall models 3lsm, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3lsm is a 2 chain structure with sequence from Coriolus zonatus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 12P, GLC, SFD, SO3 Related: 3lsh, 3lsi, 3lsk Gene: p2o (Coriolus zonatus) Activity: Pyranose oxidase, with EC number 1.1.3.10 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 Flavoenzymes perform a wide range of redox reactions in nature, and a subclass of flavoenzymes carry covalently bound cofactor. The enzyme-flavin bond helps to increase the flavin's redox potential to facilitate substrate oxidation in several oxidases. The formation of the enzyme-flavin covalent bond--the flavinylation reaction--has been studied for the past 40 years. For the most advocated mechanism of autocatalytic flavinylation, the quinone methide mechanism, appropriate stabilization of developing negative charges at the flavin N(1) and N(5) loci is crucial. Whereas the structural basis for stabilization at N(1) is relatively well studied, the structural requisites for charge stabilization at N(5) remain less clear. Here, we show that flavinylation of histidine 167 of pyranose 2-oxidase from Trametes multicolor requires hydrogen bonding at the flavin N(5)/O(4) locus, which is offered by the side chain of Thr169 when the enzyme is in its closed, but not open, state. Moreover, our data show that additional stabilization at N(5) by histidine 548 is required to ensure high occupancy of the histidyl-flavin bond. The combination of structural and spectral data on pyranose 2-oxidase mutants supports the quinone methide mechanism. Our results demonstrate an elaborate structural fine-tuning of the active site to complete its own formation that couples efficient holoenzyme synthesis to conformational substates of the substrate-recognition loop and concerted movements of side chains near the flavinylation ligand. H-bonding and positive charge at the N5/O4 locus are critical for covalent flavin attachment in trametes pyranose 2-oxidase.,Tan TC, Pitsawong W, Wongnate T, Spadiut O, Haltrich D, Chaiyen P, Divne C J Mol Biol. 2010 Sep 24;402(3):578-94. Epub 2010 Aug 12. PMID:20708626 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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