ID 6.3.3.2 DE 5-formyltetrahydrofolate cyclo-ligase. AN 5,10-methenyltetrahydrofolate synthetase. AN 5-Formyltetrahydrofolate cyclodehydrase. AN Methenyl-THF synthetase. CA (6S)-5-formyl-5,6,7,8-tetrahydrofolate + ATP = (6R)-5,10- CA methenyltetrahydrofolate + ADP + phosphate. DR Q8L539, 5FCL_ARATH ; P0AC29, 5FCL_ECO57 ; P0AC28, 5FCL_ECOLI ; DR P44905, 5FCL_HAEIN ; A0R3H2, 5FCL_MYCS2 ; Q9P7W2, FTHC_SCHPO ; DR P40099, FTHC_YEAST ; Q6KZM5, GLFT_PICTO ; Q99XR4, GLFT_STRP1 ; DR Q9HI69, GLFT_THEAC ; Q9XWE6, MTHFS_CAEEL; P49914, MTHFS_HUMAN; DR Q9D110, MTHFS_MOUSE; P47487, MTHFS_MYCGE; P75430, MTHFS_MYCPN; DR P80405, MTHFS_RABIT; //