A probable mono(ADP-ribosyl)transferase, it may ADP-ribosylate Arg in target protein(s). L-arginyl-[protein] + NAD(+) = H(+) + N(omega)-(ADP-D-ribosyl)-L-arginyl-[protein] + nicotinamide May be secreted by the ESX (type VII) secretion system. Belongs to the Arg-specific ADP-ribosyltransferase family.