label: N6-isopentenyladenosine methylthiotransferase activity
label_lc: n6-isopentenyladenosine methylthiotransferase activity
description: "Catalysis of the methylthiolation (-SCH3 addition) at the C2 of the adenosine ring of N6-isopentenyladenosine (i6A) in tRNA, to form 2-methylthio-N6-isopentenyladenosine (ms2i6A)."