5MEW image
Entry Detail
PDB ID:
5MEW
Keywords:
Title:
The study of the X-ray induced enzymatic reduction of molecular oxygen to water for laccase from Steccherinum murashkinskyi. Second structure of the series with total exposition time 33 min.
Biological Source:
PDB Version:
Deposition Date:
2016-11-16
Release Date:
2017-05-10
Method Details:
Experimental Method:
Resolution:
1.35 Å
R-Value Free:
0.15
R-Value Work:
0.13
R-Value Observed:
0.13
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Laccase 2
Chain IDs:A
Chain Length:499
Number of Molecules:1
Biological Source:Steccherinum murashkinskyi
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
NAG B NAG -D
Primary Citation
Structural study of the X-ray-induced enzymatic reduction of molecular oxygen to water by Steccherinum murashkinskyi laccase: insights into the reaction mechanism.
Acta Crystallogr D Struct Biol 73 388 401 (2017)
PMID: 28471364 DOI: 10.1107/S2059798317003667

Abstact

The laccase from Steccherinum murashkinskyi is a member of the large family of multicopper oxidases that catalyze the oxidation of a wide range of organic and inorganic substrates, accompanied by the reduction of dioxygen to water. The reducing properties of X-ray radiation and the high quality of the laccase crystals allow the study of the catalytic reduction of dioxygen to water directly in a crystal. A series of diffraction data sets with increasing absorbed radiation dose were collected from a single crystal of Steccherinum murashkinskyi laccase at 1.35 Å resolution. Changes in the active-site structure associated with the reduction of molecular oxygen to water on increasing the absorbed dose of ionizing radiation were detected. The structures in the series are mixtures of different states of the enzyme-substrate complex. Nevertheless, it was possible to interpret these structures as complexes of various oxygen ligands with copper ions in different oxidation states. The results allowed the mechanism of oxygen reduction catalyzed by laccases to be refined.

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