Functions as an ATPase. May play a role in metal insertion (metal-chelatase) or as a chaperone. The complex formed with CadA represents a possible means of regulating RavA activity in response to acid stress conditions. This interaction results in an increase in RavA ATPase activity. RavA also has GTPase activity. Optimum pH is 7.5. Hexameric oligomer. Interactions of five RavA oligomers with two CadA decamers. Possible formation of a ternary complex RavA-ViaA-CadA. Expression is sigma S-dependent. Belongs to the RavA family.