Specifically methylates guanosine-37 in various tRNAs (By similarity). tRNA [GM37] methyltransferase MRFDIITLFPEFFASPLSSGLMAKALARGIAEVVLTNPRHFSTDKHQRVDDEPYGGGVGMVMKPEPLFAAVESLPALPRREVIYVTPQGQPLTQQHLWHWSRERDQLVILCGHYEGVDERVVEHLVTQEISIGDFVLTCGEIPALVILNGVLRLLPGTVGKAASLHQDSFEDGLLDYPHYTRPAEFRGWTVPPVLLSGHHGEIAAWRRAQQIERTRQRRPDLYARWLARTQGQAKTH tlr1611 tRNA (guanine-N(1)-)-methyltransferase M1G-methyltransferase 237 trmD TRMD_THEEB