Predicted to enable COPII receptor activity. Acts upstream of or within positive regulation of apoptotic process. Predicted to be located in membrane. Predicted to be integral component of membrane. Predicted to be active in COPII-coated ER to Golgi transport vesicle. Predicted to be integral component of Golgi membrane and integral component of endoplasmic reticulum membrane. Is expressed in testis. Orthologous to human TEX261 (testis expressed 261). [provided by Alliance of Genome Resources, Apr 2022]