The enzyme from Escherichia coli catalyzes the 2'-O-methylation of cytidine or 5-carboxymethylaminomethyluridine at the wobble position at nucleotide 34 in tRNA(Leu)CmAA and tRNA(Leu)cmnm(5)UmAA.
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Specifically, YibK requires a pyrimidine nucleoside at position 34, it has a clear preference for an adenosine at position 35, and it fails to methylate without prior addition of the N(6)-(isopentenyl)-2-methylthioadenosine modification at position 37.,
The enzyme from Escherichia coli catalyzes the 2'-O-methylation of cytidine or 5-carboxymethylaminomethyluridine at the wobble position at nucleotide 34 in tRNA(Leu)CmAA and tRNA(Leu)cmnm(5)UmAA.,
The enzyme is selective for the two tRNA(Leu) isoacceptors and only methylates these when they present the correct anticodon loop sequence and modification pattern.
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| uniprot:name |
tRNA (cytidine(34)-2'-O)-methyltransferase,
tRNA (cytidine(34)/5-carboxymethylaminomethyluridine(34)-2'-O)-methyltransferase,
tRNA methyltransferase L
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| uniprot:activity |
(1) S-adenosyl-L-methionine + cytidine(34) in tRNA = S-adenosyl-L-homocysteine + 2'-O-methylcytidine(34) in tRNA.,
(2) S-adenosyl-L-methionine + 5-carboxymethylaminomethyluridine(34) in tRNA(Leu) = S-adenosyl-L-homocysteine + 5-carboxymethylaminomethyl-2'-O-methyluridine(34) in tRNA(Leu).
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