4w7o

CRYSTAL STRUCTURE OF A DECOLORIZING PEROXIDASE (DYP) FROM AURICULARIA AURICULA-JUDAE. G169L, Y147S AND W377S TRIPLE MUTANT

spinqualitylabelsall models 4w7o, resolution 1.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4w7o is a 1 chain structure with sequence from Auricularia auricula-judae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.2Å Ligands: HEM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DYP_AURAJ Manganese-independent peroxidase that is able to convert a large number of compounds, but its physiological substrate is not known. In addition to classic peroxidase substrates (e.g. 2,6-dimethoxyphenol), oxidizes dyes such as Reactive Blue 5 and Reactive Black 5. Publication Abstract from PubMed Dye-decolorizing peroxidase (DyP) of Auricularia auricula-judae has been expressed in Escherichia coli as a representative of a new DyP family, and subjected to mutagenic, spectroscopic, crystallographic and computational studies. The crystal structure of DyP shows a buried haem cofactor, and surface tryptophan and tyrosine residues potentially involved in long-range electron transfer from bulky dyes. Simulations using PELE (Protein Energy Landscape Exploration) software provided several binding-energy optima for the anthraquinone-type RB19 (Reactive Blue 19) near the above aromatic residues and the haem access-channel. Subsequent QM/MM (quantum mechanics/molecular mechanics) calculations showed a higher tendency of Trp-377 than other exposed haem-neighbouring residues to harbour a catalytic protein radical, and identified the electron-transfer pathway. The existence of such a radical in H2O2-activated DyP was shown by low-temperature EPR, being identified as a mixed tryptophanyl/tyrosyl radical in multifrequency experiments. The signal was dominated by the Trp-377 neutral radical contribution, which disappeared in the W377S variant, and included a tyrosyl contribution assigned to Tyr-337 after analysing the W377S spectra. Kinetics of substrate oxidation by DyP suggests the existence of high- and low-turnover sites. The high-turnover site for oxidation of RB19 (kcat> 200 s-1) and other DyP substrates was assigned to Trp-377 since it was absent from the W377S variant. The low-turnover site/s (RB19 kcat ~20 s-1) could correspond to the haem access-channel, since activity was decreased when the haem channel was occluded by the G169L mutation. If a tyrosine residue is also involved, it will be different from Tyr-337 since all activities are largely unaffected in the Y337S variant. Catalytic surface radical in dye-decolorizing peroxidase: a computational, spectroscopic and site-directed mutagenesis study.,Linde D, Pogni R, Canellas M, Lucas F, Guallar V, Baratto MC, Sinicropi A, Saez-Jimenez V, Coscolin C, Romero A, Medrano FJ, Ruiz-Duenas FJ, Martinez AT Biochem J. 2015 Mar 1;466(2):253-62. doi: 10.1042/BJ20141211. PMID:25495127 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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