6f73

Crystal structure of VAO-type flavoprotein MtVAO615 at pH 5.0 from Myceliophthora thermophila C1

spinqualitylabelsall models 6f73, resolution 2.22Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6f73 is a 2 chain structure with sequence from Thermothelomyces thermophilus ATCC 42464. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.22Å Ligands: FAD, NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function VAO15_THET4 Probably oxidoreductase that, when reduced, rapidly reacts with molecular oxygen, a hallmark of flavoprotein oxidases. A large panel of alcohols, including carbohydrates, steroids and secondary alcohols were tested as potential substrates, but none has been identified so far. Publication Abstract from PubMed The VAO flavoprotein family consists mostly of oxidoreductases harboring a covalently linked flavin cofactor. The linkage can be either monocovalent at position 8 with a histidine or tyrosine or bicovalent at position 8 with a histidine and at position 6 with a cysteine. Bicovalently bound flavoproteins show a preference for bulkier substrates such as oligosaccharides or secondary metabolites. The genome of the thermophilic fungus Myceliophthora thermophila C1 was found to be rich in genes encoding putative covalent VAO-type flavoproteins. Enzymes from this fungus have the advantage of being rather thermostable and homologous overexpression in M. thermophila C1 is feasible. Recently we discovered a new and VAO-type carbohydrate oxidase from this fungus: xylooligosaccharide oxidase. In this study, two other putative VAO-type oxidases, protein sequence XP_003663615 (MtVAO615) and XP_003665713 (MtVAO713), were expressed in M. thermophila C1, purified and characterized. Enzyme MtVAO615 was found to contain a bicovalently bound FAD, while enzyme MtVAO713 contained a monocovalent histidyl-bound FAD. The crystal structures of both proteins were obtained which revealed atypical active site architectures. It could be experimentally verified that both proteins, when reduced, rapidly react with molecular oxygen, a hallmark of flavoprotein oxidases. A large panel of alcohols, including carbohydrates, steroids and secondary alcohols were tested as potential substrates. For enzyme MtVAO713 low oxidase activity was discovered towards ricinoleic acid. Characterization of Two VAO-Type Flavoprotein Oxidases from Myceliophthora thermophila.,Ferrari AR, Rozeboom HJ, Vugts ASC, Koetsier MJ, Floor R, Fraaije MW Molecules. 2018 Jan 5;23(1). pii: molecules23010111. doi:, 10.3390/molecules23010111. PMID:29303991 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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