Catalyzes the transfer of phosphatidylinositol and phosphatidylcholine between membranes (in vitro). Binds calcium ions (By similarity). Interacts with CPNE4 (via VWFA domain) (PubMed:12522145). Interacts with PTK2B via its C-terminus (By similarity). May associate with the cytoskeleton. Detected in retina and in the dentate gyrus of the cerebellum. Belongs to the PtdIns transfer protein family. PI transfer class IIA subfamily.