2.7.7.86 | ATP + GTP = 2 diphosphate + cyclic Gp(2'-5')Ap(3'-5') |
catalytic mechanism of cyclic GMP-AMP synthase (cGAS). AMP-2'-GTP is produced in significant abundance initially, while 2',3'-cGAMP is not suggesting a mechanism where the majority of substrate flows through AMP-2'-GTP, which is released to solution and then must rebind in competition with ATP and GTP to form 2',3'-cGAMP. AMP-2'-GTP is not subject to ATP or GTP competition |
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