Enables cholesterol binding activity; cholesterol transfer activity; and phospholipid binding activity. Involved in cellular response to cholesterol and cholesterol homeostasis. Located in endoplasmic reticulum membrane; endoplasmic reticulum-plasma membrane contact site; and plasma membrane. Is expressed in several structures, including adrenal medulla; retina; and testis. Orthologous to human GRAMD1B (GRAM domain containing 1B). [provided by Alliance of Genome Resources, Apr 2022]