Calcineurin B homologous protein 2 (CHP2)

Functions as an integral cofactor in cell pH regulation by controlling plasma membrane-type Na(+)/H(+) exchange activity. Binds to and activates SLC9A1/NHE1 in a serum-independent fashion, thus increasing pH and protecting cells from serum deprivation- induced death.

Also plays a role in the regulation of cell proliferation and tumor growth by raising the phosphatase activity of PPP3CA at a calcium-dependent method. Activator of this calcineurin/NFAT signaling pathway.