Catalysis of the reaction: 2 S-adenosyl-L-methionine + adenine(2503) in 23S rRNA = S-adenosyl-L-homocysteine + 5'-deoxyadenosine + L-methionine + rRNA containing C2-methyladenine(2503) in 23S rRNA.
Source:http://purl.uniprot.org/go/0070040
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