4f10 Citations

Induced-fit motion of a lid loop involved in catalysis in alginate lyase A1-III.

Acta Crystallogr D Biol Crystallogr 68 1207-16 (2012)
Related entries: 4e1y, 4f13

Cited: 30 times
EuropePMC logo PMID: 22948922

Abstract

The structures of two mutants (H192A and Y246F) of a mannuronate-specific alginate lyase, A1-III, from Sphingomonas species A1 complexed with a tetrasaccharide substrate [4-deoxy-L-erythro-hex-4-ene-pyranosyluronate-(mannuronate)(2)-mannuronic acid] were determined by X-ray crystallography at around 2.2 Å resolution together with the apo form of the H192A mutant. The final models of the complex forms, which comprised two monomers (of 353 amino-acid residues each), 268-287 water molecules and two tetrasaccharide substrates, had R factors of around 0.17. A large conformational change occurred in the position of the lid loop (residues 64-85) in holo H192A and Y246F compared with that in apo H192A. The lid loop migrated about 14 Å from an open form to a closed form to interact with the bound tetrasaccharide and a catalytic residue. The tetrasaccharide was bound in the active cleft at subsites -3 to +1 as a substrate form in which the glycosidic linkage to be cleaved existed between subsites -1 and +1. In particular, the O(η) atom of Tyr68 in the closed lid loop forms a hydrogen bond to the side chain of a presumed catalytic residue, O(η) of Tyr246, which acts both as an acid and a base catalyst in a syn mechanism.

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  4. Modeling and Re-Engineering of Azotobacter vinelandii Alginate Lyase to Enhance Its Catalytic Efficiency for Accelerating Biofilm Degradation. Jang CH, Piao YL, Huang X, Yoon EJ, Park SH, Lee K, Zhan CG, Cho H. PLoS One 11 e0156197 (2016)
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  8. Engineering broad-spectrum digestion of polyuronides from an exolytic polysaccharide lyase. MacDonald LC, Weiler EB, Berger BW. Biotechnol Biofuels 9 43 (2016)
  9. Insight into the role of substrate-binding residues in conferring substrate specificity for the multifunctional polysaccharide lyase Smlt1473. MacDonald LC, Berger BW. J Biol Chem 289 18022-18032 (2014)
  10. Microbial Regulation of Deterioration and Preservation of Salted Kelp under Different Temperature and Salinity Conditions. Wei W, Zhang X, Hou Z, Hu X, Wang Y, Wang C, Yang S, Cui H, Zhu L. Foods 10 1723 (2021)
  11. Distinct Modes of Hidden Structural Dynamics in the Functioning of an Allosteric Polysaccharide Lyase. Dash P, Acharya R. ACS Cent Sci 8 933-947 (2022)
  12. Site-Directed Mutagenesis-Based Functional Analysis and Characterization of Endolytic Lyase Activity of N- and C-Terminal Domains of a Novel Oligoalginate Lyase from Sphingomonas sp. MJ-3 Possessing Exolytic Lyase Activity in the Intact Enzyme. Kim HS, Chu YJ, Park CH, Lee EY, Kim HS. Mar Biotechnol (NY) 17 782-792 (2015)
  13. A Surface Loop in the N-Terminal Domain of Pedobacter heparinus Heparin Lyase II is Important for Activity. Mori M, Ichikawa M, Kiguchi Y, Miyazaki T, Hattori M, Nishikawa A, Tonozuka T. J Appl Glycosci (1999) 63 7-11 (2016)