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Functions of the conserved anionic amino acids and those interacting with the substrate phosphate group of phosphoglucose isomerase
Author(s) -
Meng Menghsiao,
Lin Hua-Yang,
Hsieh Chia-Jung,
Chen Yen-Ting
Publication year - 2001
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(01)02507-8
Subject(s) - glucose 6 phosphate isomerase , isomerase , biochemistry , aldolase a , phosphate , amino acid , isomerization , chemistry , sugar phosphates , function (biology) , mutagenesis , enzyme , biology , mutant , catalysis , microbiology and biotechnology , gene
Phosphoglucose isomerase catalyzes the isomerization between glucose 6‐phosphate and fructose 6‐phosphate in cytoplasm, and functions as autocrine motility factor and neuroleukin outside the cells. A phosphoglucose isomerase from Bacillus stearothermophilus (pgiA) was subjected to mutagenesis study to address the catalytic function of the conserved anionic residues and those probably interacting with the phosphate group of substrates. The results suggest that Glu290 works concertedly with His311 as a general acid–base pair to initiate the isomerization step, and Glu150 assists the base function of His311. The conserved loop structure consisting of Gly205–Gly206–Arg207 plays a critical role for the recognition of substrates.