Methionyl-tRNA formyltransferase (Met-tRNA-FMT), N-terminal formyltransferase domain. Met-tRNA-FMT transfers a formyl group from N-10 formyltetrahydrofolate to the amino terminal end of a methionyl-aminoacyl-tRNA acyl moiety, yielding formyl-Met-tRNA. Formyl-Met-tRNA plays essential role in protein translation initiation by forming complex with IF2. The formyl group plays a dual role in the initiator identity of N-formylmethionyl-tRNA by promoting its recognition by IF2 and by impairing its binding to EFTU-GTP. The N-terminal domain contains a Rossmann fold and it is the catalytic domain of the enzyme.
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