Queuosine biosynthesis protein QueA 360 Transfers and isomerizes the ribose moiety from AdoMet to the 7-aminomethyl group of 7-deazaguanine (preQ1-tRNA) to give epoxyqueuosine (oQ-tRNA) (By similarity). S-adenosylmethionine:tRNA ribosyltransferase-isomerase Smed_1267 queA MRVDLFDFDLPEDSVALRPASPRDSARMLVVRPGGEPVLEDRGVLDLPSFLRQGDALVFNDTKVIPAQLEGVRYRGEHISTPVSLTLHMRVAPDRWKAFARPARRLKPGDRVSFGHGGNACLLGSLDAMVEEKGDAGEVTLRFDLSGPSLDEAIMSVGHIPLPPYIASKRADDARDRTDYQTVYAREEGAVAAPTAGLHFTDRLFAMLDEAGIERHFVTLHVGAGTFLPVKADDTDDHVMHEEIGHVDAVTAAKLNAVRERGGRVVCVGTTSLRLVESAAAEDGTIHAWSGATGIFITPGYRFRAAHMLMTNFHLPKSTLFMLVSAFAGLETMRDAYAHAIATGYRFYSYGDSSLLFRKD QUEA_SINMW