IUBMB Enzyme Nomenclature


Accepted name: tRNA (adenine9-N1)-methyltransferase

Reaction: S-adenosyl-L-methionine + adenine9 in tRNA = S-adenosyl-L-homocysteine + N1-methyladenine9 in tRNA

Other name(s): Trm10p (ambiguous); tRNA(m1G9/m1A9)-methyltransferase; tRNA(m1G9/m1A9)MTase; TK0422p (gene name); tRNA m1A9-methyltransferase; tRNA m1A9 Mtase

Systematic name: S-adenosyl-L-methionine:tRNA (adenine9-N1)-methyltransferase

Comments: The enzyme from Sulfolobus acidocaldarius specifically methylates adenine9 in tRNA [1]. The bifunctional enzyme from Thermococcus kodakaraensis also catalyses the methylation of guanine9 in tRNA (cf. EC, tRNA (guanine9-N1)-methyltransferase).

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:


1. Kempenaers, M., Roovers, M., Oudjama, Y., Tkaczuk, K.L., Bujnicki, J.M. and Droogmans, L. New archaeal methyltransferases forming 1-methyladenosine or 1-methyladenosine and 1-methylguanosine at position 9 of tRNA. Nucleic Acids Res. 38 (2010) 6533-6543. [PMID: 20525789]

[EC created 2011 (EC created 1972, part transferred 2011 to EC]

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