Involved in the regulation of endoplasmic reticulum (ER)- mitochondria coupling. Negatively regulates the ER-mitochondria distance and Ca(2+) transfer from ER to mitochondria possibly implicating it in the regulation of apoptosis (PubMed:27402544). May collaborate with RNF183 to restrain BIK protein levels thus regulating apoptotic signaling (PubMed:26567849). {ECO:0000269|PubMed:27402544, ECO:0000305|PubMed:26567849}. This is the function of FATE1 (fetal and adult testis expressed 1, Ensembl gene identifier ENSG00000147378).