Predicted to enable oxysterol binding activity. Acts upstream of or within several processes, including ear morphogenesis; negative regulation of fat cell differentiation; and negative regulation of lipid biosynthetic process. Predicted to be located in membrane. Predicted to be integral component of membrane. Predicted to be part of SREBP-SCAP-Insig complex. Predicted to be active in endoplasmic reticulum. Is expressed in several structures, including alimentary system; ganglia; neural retina; telencephalon ventricular layer; and vibrissa. Orthologous to human INSIG1 (insulin induced gene 1). [provided by Alliance of Genome Resources, Apr 2022]