Protein: Mitochondria-eating protein (Spermatid-expressing gene 1 protein) (Spetex-1) (Spermatogenesis-associated protein 18) (Q6AYL6)
Organism: Rattus norvegicus (Rat)
Function: Key regulator of mitochondrial quality that mediates the repairing or degradation of unhealthy mitochondria in response to mitochondrial damage. Mediator of mitochondrial protein catabolic process (also named MALM) by mediating the degradation of damaged proteins inside mitochondria by promoting the accumulation in the mitochondrial matrix of hydrolases that are characteristic of the lysosomal lumen. Also involved in mitochondrion degradation of damaged mitochondria by promoting the formation of vacuole-like structures (named MIV), which engulf and degrade unhealthy mitochondria by accumulating lysosomes (By similarity). The physical interaction of SPATA18/MIEAP, BNIP3 and BNIP3L/NIX at the mitochondrial outer membrane regulates the opening of a pore in the mitochondrial double membrane in order to mediate the translocation of lysosomal proteins from the cytoplasm to the mitochondrial matrix (By similarity). May have a role in spermatogenesis, especially in cell differentiation from late elongate spermatids to mature spermatozoa.
Subcellular location: Cytoplasm, cytosol {ECO:0000250|UniProtKB:Q8TC71}. Mitochondrion outer membrane {ECO:0000250|UniProtKB:Q8TC71}. Mitochondrion matrix {ECO:0000250|UniProtKB:Q8TC71}. Note=Localizes to the cytosol under normal conditions. Relocalizes to mitochondrion outer membrane following cellular stress. May form molecular condensates in the mitochondrial matrix. Colocalizes with BNIP3 and BNIP3L at the mitochondrion outer membrane. {ECO:0000250|UniProtKB:Q8TC71}.
Sequence: MAENLKKLAQSESFLSLQDKVCFWANDYQTNSCDQNLNCCIELIEQVAKVQAQLFAILTATAQEGGHNEGVETIKSRLLPLLQTSFSSLGVGKIIQTEIRPIQDFQLRSKNRQSSLDQEQQQSDGDSFIESQPTQVQDDLTESGKNLEGTKNGSAISLLAAEEEINQLKKQLKSLQAQEDARHKTSENRRAEISRTDRRPSGKRNSERPQDVVSNYEKHLKNLKDEIAVLSAEKSGLQASHRQTRSRSPSPGPRGPRGPRGRRRSRSHSRSHSRSHSRSHSHSNSHSNSRSNSPCTTVAKIRSPSPNRSKMSSVARKAALLSRFSDAYSQARLDAQCLLRRCIDRAETVQRIIYIATVEAFHIAKMAFRHFKIRVRKMLTPSHVGSNDFETAVSDYIVCHLDLYDSQSSVNDVIRAMNVNPKISFPPEVDFCLLTDFIQEICCIAFAMQSLEPPLDIAFGADGEVFNEAKYRRSYDSDFTAPLVFYHVWPALMENDCVIMKGEAVTKRGAFWTTVRPVMRCRSRSLSPICPRSRFGISTVSRSRSPSPIRCTFARY
InterPro domains: - IPR026169: Mitochondria-eating protein (family) [1-511]
- IPR031981: Mitochondria-eating protein, C-terminal domain (domain) [316-506]
Interaction partners: - Sperm microtubule inner protein 10
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0005488 (binding), GO:0005515 (protein binding)
Biological Process (BP): GO:0008150 (biological process), GO:0050896 (response to stimulus), GO:0009719 (response to endogenous stimulus), GO:0042221 (response to chemical), GO:0010033 (response to organic substance), GO:0009725 (response to hormone), GO:0048545 (response to steroid hormone), GO:0033993 (response to lipid), GO:0014070 (response to organic cyclic compound), GO:0031960 (response to corticosteroid), GO:0051384 (response to glucocorticoid)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0005737 (cytoplasm), GO:0043229 (intracellular organelle), GO:0005739 (mitochondrion), GO:0043227 (membrane-bounded organelle), GO:0043231 (intracellular membrane-bounded organelle)