Transfer RNAs acquire a large plethora of chemical modifications. Among those, modifications of the anticodon loop play important roles in translational fidelity and tRNA stability. Four human wobble U-containing tRNAs obtain 5-methoxycarbonylmethyluridine (mcmU) or 5-methoxycarbonylmethyl-2-thiouridine (mcmsU), which play a role in decoding.
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