Required for Ca(2+) flux in immune cells and plays a role in T-cell proliferation and in T-cell and neutrophil migration (By similarity). Involved in endoplasmic reticulum-associated degradation (ERAD) of soluble glycosylated proteins (By similarity). Required for cell surface expression of CD36 and involved in macrophage uptake of low-density lipoprotein and in foam cell formation (By similarity). Required for palmitoylation (By similarity). Probably mainly localized in the ER. Belongs to the selenoprotein K family. Truncated C-terminus.