The function of MOAP1 (modulator of apoptosis 1, Ensembl gene identifier ENSG00000165943) is as follows. Retrotransposon-derived protein that forms virion-like capsids (By similarity). Acts as an effector of BAX during apoptosis: enriched at outer mitochondria membrane and associates with BAX upon induction of apoptosis, facilitating BAX-dependent mitochondrial outer membrane permeabilization and apoptosis (PubMed:11060313, PubMed:16199525). Required for death receptor-dependent apoptosis (PubMed:11060313). When associated with RASSF1, promotes BAX conformational change and translocation to mitochondrial membranes in response to TNF and TNFSF10 stimulation (PubMed:15949439). Also promotes autophagy: promotes phagophore closure via association with ATG8 proteins (PubMed:33783314). Acts as an inhibitor of the NFE2L2/NRF2 pathway via interaction with SQSTM1: interaction promotes dissociation of SQSTM1 inclusion bodies that sequester KEAP1, relieving inactivation of the BCR(KEAP1) complex (PubMed:33393215). {ECO:0000250|UniProtKB:Q9ERH6, ECO:0000269|PubMed:11060313, ECO:0000269|PubMed:15949439, ECO:0000269|PubMed:16199525, ECO:0000269|PubMed:33393215, ECO:0000269|PubMed:33783314}.