Term Name: | GTP guanylyltransferase activity |
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Synonyms: | GTP:GTP guanylyltransferase activity, guanosine-triphosphate guanylyltransferase activity |
Definition: | Catalysis of the reaction: 2 GTP + H+ = P(1),P(4)-bis(5'-guanosyl) tetraphosphate + diphosphate + H+. |
Ontology: | GO: Molecular Function [GO:0047351] QuickGO AmiGO |