FUNCTION Catalyzes the reversible isomerization of alpha-D-glucose 1-phosphate to alpha-D-glucose 6-phosphate (PubMed:15378030, PubMed:25288802). The mechanism proceeds via the intermediate compound alpha-D-glucose 1,6-bisphosphate (Probable) (PubMed:25288802). This enzyme participates in both the breakdown and synthesis of glucose (PubMed:17924679, PubMed:25288802).CATALYTIC ACTIVITY alpha-D-glucose 1-phosphate = alpha-D-glucose 6-phosphateCATALYTIC ACTIVITY O-phospho-L-seryl-[protein] + alpha-D-glucose 1-phosphate = alpha-D-glucose 1,6-bisphosphate + L-seryl-[protein]CATALYTIC ACTIVITY alpha-D-glucose 1,6-bisphosphate + L-seryl-[protein] = O-phospho-L-seryl-[protein] + alpha-D-glucose 6-phosphateCOFACTOR Binds 1 Mg(2+) ion per subunit.ACTIVITY REGULATION Glucose-1,6-bisphosphate enhances phosphorylation of the active site Ser-117, and thereby increases enzyme activity.BIOPHYSICOCHEMICAL PROPERTIES Monomer.INTERACTION Phosphorylation at Thr-467 by PAK1 significantly enhances enzymatic activity.POLYMORPHISM Many polymorphic variants of PGM1 exist. 8 different alleles are known: PGM1*1+, PGM1*1-, PGM1*2+, PGM1*2-, PGM1*3+, PGM1*3-, PGM1*7+ and PGM1*7-. The sequence of PGM1*1+ is shown here.DISEASE The disease is caused by variants affecting the gene represented in this entry.SIMILARITY Belongs to the phosphohexose mutase family.SEQUENCE CAUTION Truncated N-terminus.
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