6IQY

High resolution structure of bilirubin oxidase from Myrothecium verrucaria - M467Q mutant, anaerobically prepared

Replaces:  5ZD7

Summary for 6IQY

• Entry DOI: 10.2210/pdb6iqy/pdb
• Descriptor: Bilirubin oxidase, alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, COPPER (II) ION, ... (8 entities in total)
• Functional Keywords: multicopper oxydase, oxidoreductase
• Biological source: Myrothecium verrucaria (Myrothecium leaf spot and pod blight fungus)
• Total number of polymer chains: 2
• Total formula weight: 124057.22

Authors

Shibata, N.,Akter, M.,Higuchi, Y. (deposition date: 2018-11-09, release date: 2018-11-21, Last modification date: 2024-10-16)

Primary citation

Akter, M.,Tokiwa, T.,Shoji, M.,Nishikawa, K.,Shigeta, Y.,Sakurai, T.,Higuchi, Y.,Kataoka, K.,Shibata, N.
Redox Potential-Dependent Formation of an Unusual His-Trp Bond in Bilirubin Oxidase.
Chemistry, 24:18052-18058, 2018

PubMed Abstract: Bilirubin oxidase (BOD) belongs to the family of blue multicopper oxidases, and catalyzes the concomitant oxidation of bilirubin to biliverdin and the reduction of molecular oxygen to water via a four-electron reduction system. The active sites of BOD comprise four copper atoms; type I copper (T1Cu) forms a mononuclear site, and a cluster of three copper atoms forms a trinuclear center. In the present study, we determined the high-resolution crystal structures of BOD from the fungus Myrothecium verrucaria. We investigated wild-type (WT) BOD and a BOD mutant called Met467Gln, which is inactive against bilirubin. The structures revealed that a novel post-translational crosslink between Trp396 and His398 is formed in the vicinity of the T1Cu site in WT BOD, whereas it is absent in the Met467Gln mutant. Our structural and computational studies suggest that the His-Trp crosslink adjusts the redox potential of T1Cu to that of bilirubin to efficiently abstract electrons from the substrate.

PubMed: 30156345
DOI: 10.1002/chem.201803798

Experimental method

X-RAY DIFFRACTION (1.6 Å)