ATGT_METTH MTLWEDFMFEIKSKDGLGRTGILKTEHGTVRTPALMPVIHPGKQTIDVKGPGAEIVITNAYIIYRNPELRERALSDGVHRLIDFDGPIMTDSGSFQLSEYGDIEVENPEIIRFQDEIGTDIGTSLDIPTPPGVSHRRAIEEVEVTLERARESIEYRERMMLNAVVQGSTHPDLRRYCASRLAELPVELHPIGAVVPLMESYRYRELVDAVLSSVSELPPSRPRHLMGAGHPMLFALAVSMGCDLFDSAAYILYAEDDRLLSTEGTYKLENLQEMPCSCSVCTDYTPSELMGMDREERRNLIAEHNLHVSFAEIRKVRQAIHDGNLMELVEERCRAHPRLLEGYRRMSEYLDLIEKFEPRSKRSAFFYTGPESLGRVEVHRHLKRVKEHLGERLALVAPSRRPYSSSLPARIGGFSSLRPQSGGPWRVVVVDLPFGIIPLELDQVYPLAQSDAPGIMDLDGEEFLRGLVRDLMDGDAIVDDALCSELGIELPYKYMGEVETTVDDLDRVRMVADYQFGMGAGELLFTDDVRIERSRNTGKIRHIYAGDELICTMRASDGLLVLGAEGAVRLHKGTDYPAWRVAVNEESEPFARKGKSVFAKFIIDCDNNIRANDEVLIVNADDELLATGKALLCAEEMMDLNHGQAVKTRKGGF Archaeal tRNA-guanine transglycosylase tgtA MTH_176 653 Exchanges the guanine residue with 7-cyano-7- deazaguanine (preQ0) at position 15 in the dihydrouridine loop (D- loop) of archaeal tRNAs (By similarity). 7-cyano-7-deazaguanine tRNA-ribosyltransferase