Tags: Enzyme.
In enzymology a GTP diphosphokinase (EC 2.7.6.5) is an enzyme that catalyzes the chemical reactionATP + GTP AMP + guanosine 3′-diphosphate 5′-triphosphateThus the two substrates of this enzyme are ATP and GTP whereas its two products are AMP and guanosine 3′-diphosphate 5′-triphosphate.This enzyme belongs to the family of transferases specifically those transferring two phosphorus-containing groups (diphosphotransferases).