miaB Catalyzes the methylthiolation of N6- (dimethylallyl)adenosine (i(6)A), leading to the formation of 2- methylthio-N6-(dimethylallyl)adenosine (ms(2)i(6)A) at position 37 in tRNAs that read codons beginning with uridine (By similarity). MAKKLFIETHGCQMNEYDSSRMADLLGEHQALEVTENAAEADVILLNTCSIREKAQEKVFSKLGMWRELKQQNPDLVIGVGGCVASQEGAAIRERAPYVDVVFGPQTLHRLPEMIDAARSTRKPQVDVSFPEIEKFDRLPEPRVDGPTAFVSVMEGCSKYCSFCVVPYTRGEEVSRPFDDVIAEVIHLAENGVREVTLLGQNVNGFRGLTHDGRLADFAELLRVVAAVDGIERIRYTTSHPLEFSDALIQAHAEVPELVKFIHLPVQSGSDRVLAAMKRNHTVLEYKSRIRKLKAAVPDICISSDFIVGFPGETEKDFEQTMKLVEDVGFDFSFSFIYSARPGTPAADLADDLPEEVKKQRLQILQSRIHQQGYEISRRMVGSTQRILVTDFSKKDPGMLQGRTENNRIVNFRCDNPRLIGQFAQVHIDDALPHSLRGTLIDSTLH tRNA-i(6)A37 methylthiotransferase MIAB_PSEAB PA14_12350 446 (Dimethylallyl)adenosine tRNA methylthiotransferase MiaB