Catalytic subunit of an S-adenosyl-L-methionine-dependent tRNA methyltransferase complex that mediates the methylation of the guanosine nucleotide at position 10 (m2G10) in tRNAs. guanosine(10) in tRNA + S-adenosyl-L-methionine = H(+) + N(2)-methylguanosine(10) in tRNA + S-adenosyl-L-homocysteine Interacts with TRM112. Present with 2020 molecules/cell in log phase SD medium. Belongs to the class I-like SAM-binding methyltransferase superfamily. TRM11 methyltransferase family.