GTPase-activating protein for the ADP ribosylation factor family (Potential). GTPase which may be involved in the degradation of expanded polyglutamine proteins through the ubiquitin-proteasome pathway. GTPase activity is stimulated by oxidative stress. Interacts with PML. Interacts with expanded polyglutamine proteins (By similarity). Upon oxidative stress, translocates to PML nuclear bodies. Widely expressed, with highest levels in brain. Highly expressed in the developing brain. Belongs to the centaurin gamma-like family.