Predicted to enable calcium channel activity and endoribonuclease inhibitor activity. Involved in several processes, including cellular response to unfolded protein; endoplasmic reticulum calcium ion homeostasis; and negative regulation of metabolic process. Predicted to be active in endoplasmic reticulum membrane. Is expressed in several structures, including adult head; anterior endoderm anlage; embryonic/larval garland cell; embryonic/larval midgut primordium; and gut section. Orthologous to human TMBIM6 (transmembrane BAX inhibitor motif containing 6).