Functions of the conserved anionic amino acids and those interacting with the substrate phosphate group of phosphoglucose isomerase.
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.
Meng
M
M
Graduate Institute of Agricultural Biotechnology, National Chung Hsing University, 250 Kuo-Kuang Road, 40227, Taichung, Taiwan. mhmeng@dragon.nchu.edu.tw
Lin
H Y
HY
Hsieh
C J
CJ
Chen
Y T
YT
D019943:Amino Acid Substitution / Q000235:genetics; D001665:Binding Sites; D002384:Catalysis; D017124:Conserved Sequence / Q000235:genetics*; D001411:Geobacillus stearothermophilus / Q000201:enzymology* / Q000235:genetics; D005956:Glucose-6-Phosphate Isomerase / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008958:Models, Molecular; D009154:Mutation / Q000235:genetics; D010710:Phosphates / Q000378:metabolism*; D011487:Protein Conformation; D055672:Static Electricity; D013379:Substrate Specificity; D013816:Thermodynamics
D010710:Phosphates; D005956:Glucose-6-Phosphate Isomerase