Component of the SWR1 complex which mediates the ATP-dependent exchange of histone H2A for the H2A variant H2A.F/Z leading to transcriptional regulation of selected genes (e.g. FLC) by chromatin remodeling. Component of the SWR1 chromatin-remodeling complex composed of at least ARP6/ESD1/SUF3, PIE1, SWC6, SWC2 and H2AZs (HTA8, HTA9, HTA11). Interacts directly with SWC6 and H2AZs, but not with ARP6. Belongs to the VPS72/YL1 family.