Tags: Enzyme.
In enzymology a glucose-1-phosphate guanylyltransferase (EC 2.7.7.34) is an enzyme that catalyzes the chemical reactionGTP + alpha-D-glucose 1-phosphate diphosphate + GDP-glucoseThus the two substrates of this enzyme are GTP and alpha-D-glucose 1-phosphate whereas its two products are diphosphate and GDP-glucose.This enzyme belongs to the family of transferases specifically those transferring phosphorus-containing nucleotide groups (nucleotidyltransferases).