3bg6 | pdb_00003bg6

Pyranose 2-oxidase from Trametes multicolor, E542K mutant

spinqualitylabelsall models 3bg6, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3bg6 is a 8 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: FAD Related: 1tt0, 2igo, 2ign, 2igm, 2igk, 3bg7, 3bly 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 The fungal homotetrameric flavoprotein pyranose 2-oxidase (P2Ox; EC 1.1.3.10) catalyses the oxidation of various sugars at position C2, while, concomitantly, electrons are transferred to oxygen as well as to alternative electron acceptors (e.g. oxidized ferrocenes). These properties make P2Ox an interesting enzyme for various biotechnological applications. Random mutagenesis has previously been used to identify variant E542K, which shows increased thermostability. In the present study, we selected position Leu537 for saturation mutagenesis, and identified variants L537G and L537W, which are characterized by a higher stability and improved catalytic properties. We report detailed studies on both thermodynamic and kinetic stability, as well as the kinetic properties of the mutational variants E542K, E542R, L537G and L537W, and the respective double mutants (L537G/E542K, L537G/E542R, L537W/E542K and L537W/E542R). The selected substitutions at positions Leu537 and Glu542 increase the melting temperature by approximately 10 and 14 degrees C, respectively, relative to the wild-type enzyme. Although both wild-type and single mutants showed first-order inactivation kinetics, thermal unfolding and inactivation was more complex for the double mutants, showing two distinct phases, as revealed by microcalorimetry and CD spectroscopy. Structural information on the variants does not provide a definitive answer with respect to the stabilizing effects or the alteration of the unfolding process. Distinct differences, however, are observed for the P2Ox Leu537 variants at the interfaces between the subunits, which results in tighter association. Improving thermostability and catalytic activity of pyranose 2-oxidase from Trametes multicolor by rational and semi-rational design.,Spadiut O, Leitner C, Salaheddin C, Varga B, Vertessy BG, Tan TC, Divne C, Haltrich D FEBS J. 2009 Feb;276(3):776-92. PMID:19143837 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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