Arginine hydroxylase involved in the assembly of mitochondrial NADH:ubiquinone oxidoreductase complex (complex I, MT-ND1) at early stages (, ). Acts by mediating hydroxylation of 'Arg-111' of NDUFS7 . May also have methyltransferase activity (Probable).
Subcellular locations: Mitochondrion inner membrane
Peripherally localized on the matrix face of the mitochondrial inner membrane.