Mitochondrial-processing peptidase subunit alpha is an enzyme that in humans is encoded by the PMPCAgene.[5][6][7] This gene PMPCA encoded a protein that is a member of the peptidase M16 family. This protein is located in the mitochondrial matrix and catalyzes the cleavage of the leader peptides of precursor proteins newly imported into the mitochondria, though it only functions as part of a heterodimeric complex.
The Mitochondrial-processing peptidase subunit alpha precursor protein is 58.2 KDa in size and composed of 525 amino acids. The precursor protein contains a 33 amino acid N-terminal fragment as mitochondrion targeting sequence. After cleavage, the matured PMPCA protein is 54.6 KDa in size and has a theoretical pI of 5.88.
Mitochondrial-processing peptidase (MPP) is a metalloendopeptidase, containing two structurally related subunits, Subunit alpha and mitochondrial-processing peptidase subunit beta, working in conjunction for its catalytic function.[8] Containing the catalytic site, the beta subunit PMPCB protein cleaves presequences (transit peptides) from mitochondrial protein precursors and releases of N-terminal transit peptides from precursor proteins imported into the mitochondrion, typically with Arg in position P2.
The majority of mitochondrial proteins is nuclear-coded, which necessitates proper translocations of mitochondrial targeting proteins. Many mitochondrial proteins are synthesized in a precursor form that contains mitochondria targeting sequence. These precursors are usually cleaved by peptidases and proteases before they arrive their sub-organellar locations. It is likely that altered activity of the mitochondrial processing peptidases is essential to ensure the correct maturation of mitochondrial proteins and that altered activity of these proteases will have dramatic effects in the activity, stability and assembly of mitochondrial proteins. Evidences showed that MPP was involved in the proteolytic maturation of Frataxin, a protein responsible for iron homeostasis.[9] Accordingly, MPP deficiency was shown to be involved in Friedreich ataxia, an autossomic recessive neurodegenerative disorder[10][11]
^"Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^"Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^Nagase T, Seki N, Tanaka A, Ishikawa K, Nomura N (Mar 1996). "Prediction of the coding sequences of unidentified human genes. IV. The coding sequences of 40 new genes (KIAA0121-KIAA0160) deduced by analysis of cDNA clones from human cell line KG-1". DNA Res. 2 (4): 167–74, 199–210. doi:10.1093/dnares/2.4.167. PMID8590280.
^Branda SS, Yang ZY, Chew A, Isaya G (Jun 1999). "Mitochondrial intermediate peptidase and the yeast frataxin homolog together maintain mitochondrial iron homeostasis in Saccharomyces cerevisiae". Human Molecular Genetics. 8 (6): 1099–110. doi:10.1093/hmg/8.6.1099. PMID10332043.
Luciano P, Geoffroy S, Brandt A, et al. (1997). "Functional cooperation of the mitochondrial processing peptidase subunits". J. Mol. Biol. 272 (2): 213–25. doi:10.1006/jmbi.1997.1231. PMID9299349.
Hassel S, Eichner A, Yakymovych M, et al. (2004). "Proteins associated with type II bone morphogenetic protein receptor (BMPR-II) and identified by two-dimensional gel electrophoresis and mass spectrometry". Proteomics. 4 (5): 1346–58. doi:10.1002/pmic.200300770. PMID15188402. S2CID6773754.
