Involved in tRNA methylation. Facilitates the recognition and targeting of tRNA(Arg)(CCU) and tRNA(Arg)(UCU) substrates for N(3)-methylcytidine modification by METTL2A and METTL2B. Part of a complex containing tRNA(Arg), METTL2A or METTL2B (PubMed:32427860). Interacts with tRNA(Arg)(CCU) and tRNA(Arg)(UCU) (PubMed:32427860). Interacts with METTL2A and METTL2B (PubMed:32427860). The disease may be caused by variants affecting the gene represented in this entry.