The Enzyme Database

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Accepted name: guanosine-triphosphate guanylyltransferase
Reaction: 2 GTP = diphosphate + P1,P4-bis(5′-guanosyl) tetraphosphate
Other name(s): diguanosine tetraphosphate synthetase; GTP-GTP guanylyltransferase; Gp4G synthetase; guanosine triphosphate-guanose triphosphate guanylyltransferase
Systematic name: GTP:GTP guanylyltransferase
Comments: Also acts, more slowly, on GDP to form P1,P3-bis(5′-guanosyl) triphosphate.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 54576-89-5
1.  Warner, A.H., Beers, P.C. and Huang, F.L. Biosynthesis of the diguanosine nucleotides. I. Purification and properties of an enzyme from yolk platelets of brine shrimp embryos. Can. J. Biochem. 52 (1974) 231–240. [PMID: 4208243]
[EC created 1976]

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