Sws_01653 K03639 moaA, CNX2 R09394GTP + S-Adenosyl-L-methionine + Reduced acceptor <=> (8S)-3',8-Cyclo-7,8-dihydroguanosine 5'-triphosphate + 5'-Deoxyadenosine + L-Methionine + Acceptor
GTP 3',8-cyclase [(8S)-3',8-cyclo-7,8-dihydroguanosine 5'-triphosphate-forming]