3m8m

1.05 A Structure of Manganese-free Manganese Peroxidase

spinqualitylabelsall models 3m8m, resolution 1.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3m8m is a 1 chain structure with sequence from Phanerodontia chrysosporium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.05Å Ligands: CA, GOL, HEM, MAN, NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PEM1_PHACH Catalyzes the oxidation of Mn(2+) to Mn(3+). The latter, acting as a diffusible redox mediator, is capable of oxidizing a variety of lignin compounds. 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 Manganese peroxidase (MnP) is an extracellular heme enzyme produced by the lignin-degrading white-rot fungus Phanerochaete chrysosporium. MnP catalyzes the peroxide-dependent oxidation of Mn(II) to Mn(III). The Mn(III) is released from the enzyme in complex with oxalate, enabling the oxalate-Mn(III) complex to serve as a diffusible redox mediator capable of oxidizing lignin, especially under the mediation of unsaturated fatty acids. One heme propionate and the side chains of Glu35, Glu39 and Asp179 have been identified as Mn(II) ligands in our previous crystal structures of native MnP. In our current work, new 0.93A and 1.05A crystal structures of MnP with and without bound Mn(II), respectively, have been solved. This represents only the sixth structure of a protein of this size at 0.93A resolution. In addition, this is the first structure of a heme peroxidase from a eukaryotic organism at sub-Angstrom resolution. These new structures reveal an ordering/disordering of the C-terminal loop, which is likely required for Mn binding and release. In addition, the catalytic Arg42 residue at the active site, normally thought to function only in the peroxide activation process, also undergoes ordering/disordering that is coupled to a transient H-bond with the Mn ligand, Glu39. Finally, these high-resolution structures also reveal the exact H atoms in several parts of the structure that are relevant to the catalytic mechanism. Ultrahigh (0.93A) resolution structure of manganese peroxidase from Phanerochaete chrysosporium: implications for the catalytic mechanism.,Sundaramoorthy M, Gold MH, Poulos TL J Inorg Biochem. 2010 Jun;104(6):683-90. Epub 2010 Mar 6. PMID:20356630 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Manganese peroxidase

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