Reaction: S-adenosyl-L-methionine + guanine2069 in 23S rRNA = S-adenosyl-L-homocysteine + N7-methylguanine2069 in 23S rRNA
Other name(s): rlmK (gene name); 23S rRNA m7G2069 methyltransferase
Systematic name: S-adenosyl-L-methionine:23S rRNA (guanine2069-N7)-methyltransferase
Comments: The enzyme specifically methylates guanine2069 at position N7 in 23S rRNA. In γ-proteobacteria the enzyme also catalyses EC 22.214.171.124, 23S rRNA (guanine2445-N2)-methyltransferase, while in β-proteobacteria the activities are carried out by separate proteins . The enzyme from the γ-proteobacterium Escherichia coli has RNA unwinding activity as well .
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
1. Kimura, S., Ikeuchi, Y., Kitahara, K., Sakaguchi, Y., Suzuki, T. and Suzuki, T. Base methylations in the double-stranded RNA by a fused methyltransferase bearing unwinding activity. Nucleic Acids Res. 40 (2012) 4071-4085. [PMID: 22210896]