guanosine-triphosphate guanylyltransferase activity (Q22321416)
Catalysis of the reaction: 2 GTP = P(1),P(4)-bis(5'-guanosyl) tetraphosphate + diphosphate + H(+).
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aliases GTP guanylyltransferase activity
 GO:0047351
description Catalysis of the reaction: 2 GTP = P(1),P(4)-bis(5'-guanosyl) tetraphosphate + diphosphate + H(+).

External Links
(P665) R00012
(P686) GO:0047351