Predicted to enable COPII receptor activity. Predicted to be involved in endoplasmic reticulum to Golgi vesicle-mediated transport. Predicted to act upstream of or within positive regulation of apoptotic process. 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. Orthologous to human TEX261 (testis expressed 261). [provided by Alliance of Genome Resources, Apr 2022]