Regulator of autophagy that contributes to antagonize BECN1-mediated cellular autophagy at the endoplasmic reticulum. Participates in the interaction of BCL2 with BECN1 and is required for BCL2-mediated depression of endoplasmic reticulum Ca(2+) stores during autophagy. Contributes to BIK-initiated autophagy, while it is not involved in BIK-dependent activation of caspases. Involved in life span control, probably via its function as regulator of autophagy (By similarity). Binds 1 [2Fe-2S] cluster. Homodimer. Interacts with BCL2; the interaction is direct and disrupted by BIK interaction with BCL2. Interacts with BCL2L1. Interacts with ITPR1 (By similarity). Belongs to the CISD protein family. CISD2 subfamily.