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Information on EC - 23S rRNA (adenine2503-C8)-methyltransferase

for references in articles please use BRENDA:EC2.1.1.224
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IUBMB Comments
This enzyme is a member of the 'AdoMet radical' (radical SAM) family. S-Adenosyl-L-methionine acts as both a radical generator and as the source of the appended methyl group. It contains an [4Fe-4S] cluster [3,6,7]. Cfr is an plasmid-acquired methyltransferase that protects cells from the action of antibiotics . The enzyme methylates adenosine at position 2503 of 23S rRNA by a radical mechanism, transferring a CH2 group from S-adenosyl-L-methionine while retaining the hydrogen at the C-8 position of the adenine. Cfr first transfers an CH2 group to a conserved cysteine (Cys338 in Staphylococcus aureus) , the generated radical from a second S-adenosyl-L-methionine then attacks the methyl group, exctracting a hydrogen. The formed radical forms a covalent intermediate with the adenine group of the tRNA . The enzyme will also methylate 2-methyladenine produced by the action of EC [23S rRNA (adenine2503-C2)-methyltransferase].
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The enzyme appears in viruses and cellular organisms
Cfr, Cfr methyltransferase, Cfr rRNA methyltransferase, Cfr-like protein, ClbA, ClbB, ClbC, radical AdoMet rRNA methyltransferase, radical-S-adenosyl-L-methionine enzyme, radical-SAM enzyme, more
2 S-adenosyl-L-methionine + adenine2503 in 23S rRNA + 2 reduced [2Fe-2S] ferredoxin = S-adenosyl-L-homocysteine + L-methionine + 5'-deoxyadenosine + 8-methyladenine2503 in 23S rRNA + 2 oxidized [2Fe-2S] ferredoxin
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