ENZYME entry: EC 2.1.1.207

Accepted Name

tRNA (cytidine(34)-2'-O)-methyltransferase

Alternative Name(s)

tRNA (cytidine(34)/5-carboxymethylaminomethyluridine(34)-2'-O)- methyltransferase

tRNA methyltransferase L

Reaction catalysed

cytidine(34) in tRNA + S-adenosyl-L-methionine = 2'-O-methylcytidine(34) in tRNA + S-adenosyl-L-homocysteine + H(+)
5-carboxymethylaminomethyluridine(34) in tRNA(Leu) + S-adenosyl-L-methionine = 5-carboxymethylaminomethyl-2'-O-methyluridine(34) in tRNA(Leu) + S-adenosyl-L-homocysteine + H(+)

Comment(s)

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.
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.

Cross-references

BRENDA

EC2PDB

ExplorEnz

KEGG Ligand Database for Enzyme Nomenclature

IUBMB Enzyme Nomenclature

MEDLINE

MetaCyc

Rhea expert-curated reactions

UniProtKB/Swiss-Prot

All UniProtKB/Swiss-Prot entries referenced in this entry, with possibility to download in different formats, align etc.

All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.1.1.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.1.-.-
All ENZYME / UniProtKB/Swiss-Prot entries corresponding to 2.-.-.-