Centaurins are a family of proteins that contain an Arf-GAP domain, ankyrin repeats and PH (pleckstrin homology). The human centaurin gamma subfamily is represented by three isoforms, centaurin gamma-1, centaurin gamma-2 and centaurin gamma-3, which are highly similar in primary structure. Centaurin gamma 1 is an enzyme that in humans is encoded by the AGAP2 gene and it is found mainly in the nucleus. It interacts with phosphoinositide 3-kinase regulatory subunit alpha (PIK3R1), Homer protein homolog 1 (Homer 1) and Band 4.1-like protein 1 (EPB41L1). Centaurin gamma 1 has been shown to be involved in small GTPase mediated signal transduction, regulation of ARF GTPase activity and negative regulation of neuron apoptosis.