(NADH Dehydrogenase (Ubiquinone) Complex I, Assembly Factor 7 (NDUFAF7))
Arginine methyltransferase involved in the assembly or stability of mitochondrial NADH:ubiquinone oxidoreductase complex (complex I). Acts by mediating symmetric dimethylation of 'Arg- 118' of NDUFS2 after it assembles into the complex I, stabilizing the early intermediate complex. {ECO:0000250|UniProtKB:Q7L592}.