Abstract
The tRNA specific for methionine (tRNA M et ) of human mitochondria contains a formyl‐cytosine at the wobble position of the anticodon to facilitate its binding to AUG, AUA and (in one instance) to AUU. In this issue of The EMBO Journal , Haag et al identify a two‐step enzyme pathway facilitating the modification of the tRNA. Sequential reactions of the methyltransferase NSUN3 and the dioxygenase ALKBH1/ABH1 are important to render the tRNA as able to recognize the non‐canonical methionine codons AUA and AUUs, a property critical for efficient protein synthesis in human mitochondria.
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