4YVN

Crystal structure of CotA laccase complexed with ABTS at a novel binding site

Summary for 4YVN

• Entry DOI: 10.2210/pdb4yvn/pdb
• Related: 4YVU
• Descriptor: Spore coat protein A, COPPER (II) ION, 3-ETHYL-2-[(2Z)-2-(3-ETHYL-6-SULFO-1,3-BENZOTHIAZOL-2(3H)-YLIDENE)HYDRAZINO]-6-SULFO-3H-1,3-BENZOTHIAZOL-1-IUM, ... (6 entities in total)
• Functional Keywords: spore coat protein a, oxidoreductase, laccase, abts
• Biological source: Bacillus subtilis (strain 168)
• Total number of polymer chains: 1
• Total formula weight: 59682.48

Authors

Liu, Z.C.,Xie, T.,Wang, G.G. (deposition date: 2015-03-20, release date: 2016-03-30, Last modification date: 2024-11-20)

Primary citation

Liu, Z.,Xie, T.,Zhong, Q.,Wang, G.
Crystal structure of CotA laccase complexed with 2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonate) at a novel binding site
Acta Crystallogr.,Sect.F, 72:328-335, 2016

PubMed Abstract: The CotA laccase from Bacillus subtilis is an abundant component of the spore outer coat and has been characterized as a typical laccase. The crystal structure of CotA complexed with 2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonate) (ABTS) in a hole motif has been solved. The novel binding site was about 26 Å away from the T1 binding pocket. Comparison with known structures of other laccases revealed that the hole is a specific feature of CotA. The key residues Arg476 and Ser360 were directly bound to ABTS. Site-directed mutagenesis studies revealed that the residues Arg146, Arg429 and Arg476, which are located at the bottom of the novel binding site, are essential for the oxidation of ABTS and syringaldazine. Specially, a Thr480Phe variant was identified to be almost 3.5 times more specific for ABTS than for syringaldazine compared with the wild type. These results suggest this novel binding site for ABTS could be a potential target for protein engineering of CotA laccases.

PubMed: 27050268
DOI: 10.1107/S2053230X1600426X

Experimental method

X-RAY DIFFRACTION (2.3 Å)