Catalytic activity:S-adenosyl-L-methionine + rRNA = S-adenosyl-L-homocysteine + rRNA containing 2'-O-methyluridine.,Function:Specifically methylates guanosine-4 in various tRNAs with a Gly(CCG), His or Pro signature.,similarity:Belongs to the TRM13 family.,similarity:Contains 1 CHHC-type zinc finger.,