3.1.3.9 D-glucose 6-phosphate + H2O = D-glucose + phosphate kinetic mechanism applicable generally to both hydrolytic and synthetic activities is a specific adaption of the generally applicable kinetic mechanism for enzymes with modified ping pong bi bi kinetics 134929 3.1.3.9 D-glucose 6-phosphate + H2O = D-glucose + phosphate reaction mechanism, His176 is the amino acid in enzyme that acts as the nucleophile forming the phosphohistidine-enzyme intermediate during catalysis 652292 3.1.3.9 D-glucose 6-phosphate + H2O = D-glucose + phosphate reaction mechanism: substrate-transport model 649729 3.1.3.9 D-glucose 6-phosphate + H2O = D-glucose + phosphate The enzyme family comprises two active isozyme: the D-glucose 6-phosphatase-alpha, in which is His176 the amino acid in enzyme that acts as the nucleophile forming the phosphohistidine-enzyme intermediate during catalysis and the D-glucose 6-phosphatase-alpha, in which is His167 the amino acid in enzyme that acts as the nucleophile forming the phosphohistidine-enzyme intermediate during catalysis. Both enzyme-alpha and enzyme-beta couple with the D-glucose 6-phosphate transporter to form an active enzyme complex 652517 3.1.3.9 D-glucose 6-phosphate + H2O = D-glucose + phosphate two proposed concepts of structure-function relationships for enzyme, According to the substrate transport-catalytic unit concept, enzyme is a multicomponent system consisting of a fairly non-specific catalytic unit with its active site located on the lumental side of endoplasmic reticulum, and at least three transmembrane-spanning translocases that confer specificity to this system by allowing selective substrates/products access to, or egress from, the sequestered catalytic unit. According to the combined conformational flexibility-substrate transport concept, enzyme is a multifunctional enzyme embedded within the endoplasic reticulum membrane that possess both catalytic and substrate/product transport activities. 651203