tRNA (guanine(27)-N2)-dimethyltransferase activity
trna (guanine(27)-n2)-dimethyltransferase activity
Catalysis of the reaction: guanosine(27) in tRNA + 2 S-adenosyl-L-methionine = 2 H+ + N(2)-dimethylguanosine(27) in tRNA + 2 S-adenosyl-L-homocysteine.