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Computational study of human phosphomannose isomerase: Insights from homology modeling and molecular dynamics simulation of enzyme bound substrate by Jingfa Xiao; Zongru Guo; Yanshen Guo; Fengming Chu; Piaoyang Sun is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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Phosphomannose isomerase is a zinc metalloenzyme that catalyzes the reversible isomerization of mannose-6-phosphate and fructose-6phosphate, and the three-dimensional (3D) structure of human phosphomannose isomerase has not been reported. In order to understand the catalytic mechanism, the 3D structure of the protein is built by using homology modeling based on the known crystal structure of mannose-6phosphate isomerase from (PDB code 1PMI). The model structure is further refined by energy minimization and molecular dynamics methods. The mannose-6-phosphate-enzyme complex is developed by molecular docking and the key residues involved in the ligand binding are determined, which will facilitate the understanding of the action mode of the ligands and guide further genetic studies. Our results suggest a hydride transfer mechanism of a-hydrogen between the C1 and C2 positions but do not support the cis-enediol mechanism. The detailed mechanism involves, on one side, Zn 2+ mediating the movement of a proton between O1 and O2, and, on the other side, the hydrophobic environment formed in part by Tyr 278 promoting transfer of a hydride ion.

Who reads Computational study of human phosphomannose isomerase: Insights from homology modeling and molecular dynamics simulation of enzyme bound substrate?

Author

Jingfa Xiao; Zongru Guo; Yanshen Guo; Fengming Chu; Piaoyang Sun

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1093-3263)

Published

2006

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Physical Sciences)