Membrane protein with three predicted transmembrane segments, two of which contain conserved Arg residues. AtpR genes are found in the N-ATPase (archaeal-type F1-Fo-ATPase) operons and are predicted to interact with the conserved Glu/Asp residues in the c subunits, regulating the assembly and/or function of the membrane-embedded ring of 'c' (proteolipid) subunits (PFAM:PF00137).

1: Characterization of the N-ATPase, a distinct, laterally transferred Na+-translocating form of the bacterial F-type membrane ATPase. Dibrova DV, Galperin MY, Mulkidjanian AY; Bioinformatics. 2010; [Epub ahead of print] PMID:20472544