The Enzyme Database

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Accepted name: 23S rRNA (guanine2535-N1)-methyltransferase
Reaction: S-adenosyl-L-methionine + guanine2535 in 23S rRNA = S-adenosyl-L-homocysteine + N1-methylguanine2535 in 23S rRNA
Other name(s): AviRa
Systematic name: S-adenosyl-L-methionine:23S rRNA (guanine2535-N1)-methyltransferase
Comments: Streptomyces viridochromogenes produces the antibiotic avilamycin A which binds to the 50S ribosomal subunit to inhibit protein synthesis. To protect itself from the antibiotic, Streptomyces viridochromogenes utilizes two methyltransferases, 23S rRNA (guanine2535-N1)-methyltransferase and EC [23S rRNA (uridine2479-2-O)-methyltransferase], whose actions confer avilamycin resistance to the RNA.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Treede, I., Jakobsen, L., Kirpekar, F., Vester, B., Weitnauer, G., Bechthold, A. and Douthwaite, S. The avilamycin resistance determinants AviRa and AviRb methylate 23S rRNA at the guanosine 2535 base and the uridine 2479 ribose. Mol. Microbiol. 49 (2003) 309–318. [PMID: 12828631]
2.  Weitnauer, G., Gaisser, S., Trefzer, A., Stockert, S., Westrich, L., Quiros, L.M., Mendez, C., Salas, J.A. and Bechthold, A. An ATP-binding cassette transporter and two rRNA methyltransferases are involved in resistance to avilamycin in the producer organism Streptomyces viridochromogenes Tu57. Antimicrob. Agents Chemother. 45 (2001) 690–695. [PMID: 11181344]
3.  Mosbacher, T.G., Bechthold, A. and Schulz, G.E. Crystal structure of the avilamycin resistance-conferring methyltransferase AviRa from Streptomyces viridochromogenes. J. Mol. Biol. 329 (2003) 147–157. [PMID: 12742024]
[EC created 2011]

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