Catalyzes the transfer of phosphatidylinositol and phosphatidylcholine between membranes (in vitro) (By similarity). Binds calcium ions. Interacts with PTK2B via its C-terminus. Detected in brain and spleen, and at low levels in ovary. The disease is caused by variants affecting the gene represented in this entry. May be due to an intron retention. Belongs to the PtdIns transfer protein family. PI transfer class IIA subfamily.