This gene encodes a subunit of mitochondrial ATP synthase. Mitochondrial ATP synthase catalyzes ATP synthesis, using an electrochemical gradient of protons across the inner membrane during oxidative phosphorylation. ATP synthase is composed of two linked multi-subunit complexes: the soluble catalytic core, F1, and the membrane-spanning component, Fo, comprising the proton channel. The catalytic portion of mitochondrial ATP synthase consists of 5 different subunits (alpha, beta, gamma, delta, and epsilon) assembled with a stoichiometry of 3 alpha, 3 beta, and a single representative of the other 3. The proton channel consists of three main subunits (a, b, c). This gene encodes the alpha subunit of the catalytic core. Alternatively spliced transcript variants encoding the same protein have been identified. Pseudogenes of this gene are located on chromosomes 9, 2, and 16.
The ATP5A1 gene, located on the q arm of chromosome 18 in position 21, is made up of 13 exons and is 20,090 base pairs in length. The ATP5A1 protein weighs 59.7 kDa and is composed of 553 amino acids. The protein is a subunit of the catalytic portion of the F1Fo ATPase, also known as Complex V, which consists of 14 nuclear and 2 mitochondrial -encoded subunits. As an alpha subunit, ATP5A1 is contained within the catalytic F1 portion of the complex. The nomenclature of the enzyme has a long history. The F1 fraction derives its name from the term "Fraction 1" and Fo (written as a subscript letter "o", not "zero") derives its name from being the binding fraction for oligomycin, a type of naturally-derived antibiotic that is able to inhibit the Fo unit of ATP synthase. The F1 particle is large and can be seen in the transmission electron microscope by negative staining. These are particles of 9 nm diameter that pepper the inner mitochondrial membrane. They were originally called elementary particles and were thought to contain the entire respiratory apparatus of the mitochondrion, but, through a long series of experiments, Efraim Racker and his colleagues (who first isolated the F1 particle in 1961) were able to show that this particle is correlated with ATPase activity in uncoupled mitochondria and with the ATPase activity in submitochondrial particles created by exposing mitochondria to ultrasound. This ATPase activity was further associated with the creation of ATP by a long series of experiments in many laboratories.
Mitochondrial membrane ATP synthase (F1Fo ATP synthase or Complex V) produces ATP from ADP in the presence of a proton gradient across the membrane which is generated by electron transport complexes of the respiratory chain. F-type ATPases consist of two structural domains, F1 - containing the extramembraneous catalytic core, and Fo - containing the membrane proton channel, linked together by a central stalk and a peripheral stalk. During catalysis, ATP synthesis in the catalytic domain of F1 is coupled via a rotary mechanism of the central stalk subunits to proton translocation. Subunits alpha and beta form the catalytic core in F1. Rotation of the central stalk against the surrounding alpha(3)beta(3) subunits leads to hydrolysis of ATP in three separate catalytic sites on the beta subunits. Subunit alpha does not bear the catalytic high-affinity ATP-binding sites.
Mutations affecting the ATP5A1 gene cause combined oxidative phosphorylation deficiency 22 (COXPD22), a mitochondrial disorder characterized by intrauterine growth retardation, microcephaly, hypotonia, pulmonary hypertension, failure to thrive, encephalopathy, and heart failure. Mutations on the ATP5A1 gene also cause mitochondrial complex V deficiency, nuclear 4 (MC5DN4), a mitochondrial disorder with heterogeneous clinical manifestations including dysmorphic features, psychomotor retardation, hypotonia, growth retardation, cardiomyopathy, enlarged liver, hypoplastic kidneys and elevated lactate levels in urine, plasma and cerebrospinal fluid.
Male and female animals underwent a standardized phenotypic screen to determine the effects of deletion. Twenty two tests were carried out on mutant mice and five significant abnormalities were observed. No homozygousmutant embryos were identified during gestation, and therefore none survived until weaning. The remaining tests were carried out on heterozygous mutant adult mice and decreased body weight, lean body mass and hypoproteinemia was observed in female animals.
^Kataoka H, Biswas C (July 1991). "Nucleotide sequence of a cDNA for the alpha subunit of human mitochondrial ATP synthase". Biochimica et Biophysica Acta. 1089 (3): 393–5. PMID1830491. doi:10.1016/0167-4781(91)90183-m.
^Kagawa Y, Racker E (May 1966). "Partial resolution of the enzymes catalyzing oxidative phosphorylation. 8. Properties of a factor conferring oligomycin sensitivity on mitochondrial adenosine triphosphatase". The Journal of Biological Chemistry. 241 (10): 2461–6. PMID4223640.
Kovalyov LI, Shishkin SS, Efimochkin AS, Kovalyova MA, Ershova ES, Egorov TA, Musalyamov AK (July 1995). "The major protein expression profile and two-dimensional protein database of human heart". Electrophoresis. 16 (7): 1160–9. PMID7498159. doi:10.1002/elps.11501601192.
Abrahams JP, Leslie AG, Lutter R, Walker JE (August 1994). "Structure at 2.8 A resolution of F1-ATPase from bovine heart mitochondria". Nature. 370 (6491): 621–8. PMID8065448. doi:10.1038/370621a0.
Akiyama S, Endo H, Inohara N, Ohta S, Kagawa Y (September 1994). "Gene structure and cell type-specific expression of the human ATP synthase alpha subunit". Biochimica et Biophysica Acta. 1219 (1): 129–40. PMID8086450. doi:10.1016/0167-4781(94)90255-0.
Jabs EW, Thomas PJ, Bernstein M, Coss C, Ferreira GC, Pedersen PL (May 1994). "Chromosomal localization of genes required for the terminal steps of oxidative metabolism: alpha and gamma subunits of ATP synthase and the phosphate carrier". Human Genetics. 93 (5): 600–2. PMID8168843. doi:10.1007/bf00202832.
Godbout R, Bisgrove DA, Honoré LH, Day RS (January 1993). "Amplification of the gene encoding the alpha-subunit of the mitochondrial ATP synthase complex in a human retinoblastoma cell line". Gene. 123 (2): 195–201. PMID8428659. doi:10.1016/0378-1119(93)90124-L.
Godbout R, Pandita A, Beatty B, Bie W, Squire JA (1997). "Comparative genomic hybridization analysis of Y79 and FISH mapping indicate the amplified human mitochondrial ATP synthase alpha-subunit gene (ATP5A) maps to chromosome 18q12-->q21". Cytogenetics and Cell Genetics. 77 (3-4): 253–6. PMID9284928. doi:10.1159/000134588.
Elston T, Wang H, Oster G (January 1998). "Energy transduction in ATP synthase". Nature. 391 (6666): 510–3. PMID9461222. doi:10.1038/35185.
Wang H, Oster G (November 1998). "Energy transduction in the F1 motor of ATP synthase". Nature. 396 (6708): 279–82. PMID9834036. doi:10.1038/24409.
Wang ZG, White PS, Ackerman SH (August 2001). "Atp11p and Atp12p are assembly factors for the F(1)-ATPase in human mitochondria". The Journal of Biological Chemistry. 276 (33): 30773–8. PMID11410595. doi:10.1074/jbc.M104133200.
Chang SY, Park SG, Kim S, Kang CY (March 2002). "Interaction of the C-terminal domain of p43 and the alpha subunit of ATP synthase. Its functional implication in endothelial cell proliferation". The Journal of Biological Chemistry. 277 (10): 8388–94. PMID11741979. doi:10.1074/jbc.M108792200.
Sergeant N, Wattez A, Galván-valencia M, Ghestem A, David JP, Lemoine J, Sautiére PE, Dachary J, Mazat JP, Michalski JC, Velours J, Mena-López R, Delacourte A (2003). "Association of ATP synthase alpha-chain with neurofibrillary degeneration in Alzheimer's disease". Neuroscience. 117 (2): 293–303. PMID12614671. doi:10.1016/S0306-4522(02)00747-9.
Bouwmeester T, Bauch A, Ruffner H, Angrand PO, Bergamini G, Croughton K, Cruciat C, Eberhard D, Gagneur J, Ghidelli S, Hopf C, Huhse B, Mangano R, Michon AM, Schirle M, Schlegl J, Schwab M, Stein MA, Bauer A, Casari G, Drewes G, Gavin AC, Jackson DB, Joberty G, Neubauer G, Rick J, Kuster B, Superti-Furga G (February 2004). "A physical and functional map of the human TNF-alpha/NF-kappa B signal transduction pathway". Nature Cell Biology. 6 (2): 97–105. PMID14743216. doi:10.1038/ncb1086.
Jin J, Smith FD, Stark C, Wells CD, Fawcett JP, Kulkarni S, Metalnikov P, O'Donnell P, Taylor P, Taylor L, Zougman A, Woodgett JR, Langeberg LK, Scott JD, Pawson T (August 2004). "Proteomic, functional, and domain-based analysis of in vivo 14-3-3 binding proteins involved in cytoskeletal regulation and cellular organization". Current Biology. 14 (16): 1436–50. PMID15324660. doi:10.1016/j.cub.2004.07.051.