Atomic resolution crystal structure of VcLMWPTP-1 from Vibrio cholerae 0395: Insights into a novel mode of dimerization in the low molecular weight protein tyrosine phosphatase family

作者：Nath Seema; Banerjee Ramanuj; Sen Udayaditya^*

来源：Biochemical and Biophysical Research Communications, 2014, 450(1): 390-395.

DOI：10.1016/j.bbrc.2014.05.129

• Bacterial protein phosphatases
• Low molecular weight protein tyrosine
• phosphatases
• X-ray crystallography
• Active timer

Low molecular weight protein tyrosine phosphatase (LMWPTP) is a group of phosphotyrosine phosphatase ubiquitously found in a wide range of organisms ranging from bacteria to mammals. Dimerization in the LMWPTP family has been reported earlier which follows a common mechanism involving active site residues leading to an enzymatically inactive species. Here we report a novel form of dimerization in a LMWPTP from Vibrio cholera 0395 (VcLMWPTP-1). Studies in solution reveal the existence of the dimer in solution while kinetic study depicts the active form of the enzyme. This indicates that the mode of dimerization in VcLMWPTP-1 is different from others where active site residues are not involved in the process. A high resolution (1.45 angstrom) crystal structure of VcLMWPTP-1 confirms a different mode of dimerization where the active site is catalytically accessible as evident by a tightly bound substrate mimicking ligand, MOPS at the active site pocket. Although being a member of a prokaryotic protein family, VcLMWPTP-1 structure resembles very closely to LMWPTP from a eukaryote, Entamoeba histolytica. It also delineates the diverse surface properties around the active site of the enzyme.

• 出版日期2014-7-18