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{{Short description|Protein-coding gene in the species Homo sapiens}}
{{Infobox_gene}}
'''Trifunctional enzyme subunit alpha, mitochondrial''' also known as '''hydroxyacyl-CoA dehydrogenase/3-ketoacyl-CoA thiolase/enoyl-CoA hydratase (trifunctional protein), alpha subunit''' is a [[protein]] that in humans is encoded by the ''HADHA'' [[gene]]. Mutations in ''HADHA'' have been associated with [[Mitochondrial trifunctional protein deficiency|trifunctional protein deficiency]] or [[long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency]].<ref name="entrez">{{cite web
==Structure==
HADHA is
The [[mitochondrial]] membrane-bound heterocomplex is composed of four alpha and four beta subunits, with the alpha subunit catalyzing the [[3-hydroxyacyl-CoA dehydrogenase]] and [[enoyl-CoA hydratase]] activities. The genes of the alpha and beta subunits of the mitochondrial trifunctional protein are located adjacent to each other in the human genome in a head-to-head orientation.<ref name="entrez"/>
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== Function ==
This gene encodes the alpha subunit of the mitochondrial trifunctional protein, which catalyzes the last three steps of mitochondrial [[Beta oxidation|beta-oxidation]] of long chain fatty acids.<ref name="entrez"/> The enzyme converts medium- and long-chain 2-enoyl-CoA compounds into the following 3-ketoacyl-CoA when NAD is solely present, and [[acetyl-CoA]] when NAD and [[CoASH]] are present.<ref>{{cite journal | vauthors = Carpenter K, Pollitt RJ, Middleton B | title = Human liver long-chain 3-hydroxyacyl-coenzyme A dehydrogenase is a multifunctional membrane-bound beta-oxidation enzyme of mitochondria | journal = Biochemical and Biophysical Research Communications | volume = 183 | issue = 2 | pages = 443–8 | date = Mar 1992 | pmid = 1550553 | doi=10.1016/0006-291x(92)90501-b}}</ref> The alpha subunit catalyzes this reaction, and is attached to [[HADHB]], which catalyzes the last step of the reaction.<ref name="BioChem">{{cite book | title = Principles of Biochemistry | chapter = Chapter 18, Mitochondrial ATP synthesis | first1 = Donald J. | last1 = Voet | first2 = Judith G. | last2 = Voet | first3 = Charlotte W. | last3 = Pratt | publisher = Wiley | year = 2010 | isbn = 978-0-470-23396-2 | page = 669 | edition = 4th | name-list-
== Clinical significance ==
Mutations in this gene result in trifunctional protein deficiency or [[long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency]].<ref name="entrez"/>
The most common form of the mutation is G1528C, in which the [[guanine]] at the 1528th position is changed to a [[cytosine]]. The gene mutation creates a protein deficiency that is associated with impaired oxidation of [[Fatty acid|long-chain fatty acids]] that can lead to sudden infant death.<ref>{{cite journal | vauthors = IJlst L, Ruiter JP, Hoovers JM, Jakobs ME, Wanders RJ | title = Common missense mutation G1528C in long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency. Characterization and expression of the mutant protein, mutation analysis on genomic DNA and chromosomal localization of the mitochondrial trifunctional protein alpha subunit gene | journal = The Journal of Clinical Investigation | volume = 98 | issue = 4 | pages = 1028–33 | date =
From a clinical perspective, HADHA might also be a useful marker to predict resistance to certain types of [[chemotherapy]] in patients with [[lung cancer]].<ref>{{cite journal | vauthors = Kageyama T, Nagashio R, Ryuge S, Matsumoto T, Iyoda A, Satoh Y, Masuda N, Jiang SX, Saegusa M, Sato Y | title = HADHA is a potential predictor of response to platinum-based chemotherapy for lung cancer | journal = Asian Pacific Journal of Cancer Prevention | volume = 12 | issue = 12 | pages = 3457–63 | date = 2011 | pmid = 22471497 }}</ref>
== Interactions ==
HADHA has been shown to have 142 binary [[Protein–protein interaction|protein-protein interactions]] including 117 co-complex interactions. HADHA appears to interact with [[GABARAP]], [[MAP1LC3B]], [[TRAF6]], [[GABARAPL2]], GABARAPL1, GAST, [[BCAR3]], [[EPB41]], [[TNFRSF1A]], [[HLA-B]], [[NFKB2]], [[MAP3K1]], [[IKBKE]], [[PRKAB1]], [[RIPK3]], [[CD74]], [[NR4A1]], cdsA, mtaD, [[ATXN2L]], [[ABCF2]], and [[MAPK3]].<ref>{{Cite web | url = https://www.ebi.ac.uk/intact/interactions?conversationContext=3&query=HADHA | title = 142 binary interactions found for search term HADHA | work = IntAct Molecular Interaction Database | publisher = EMBL-EBI | access-date = 2018-08-25 }}</ref>
== References ==
{{reflist|
== Further reading ==
{{refbegin|
* {{cite journal | vauthors = Rakheja D, Bennett MJ, Rogers BB | title = Long-chain L-3-hydroxyacyl-coenzyme a dehydrogenase deficiency: a molecular and biochemical review | journal = Laboratory Investigation | volume = 82 | issue = 7 | date = Jul 2002 | pmid = 12118083 | doi=10.1097/01.lab.0000021175.50201.46 | pages=815–24| doi-access = free }}
* {{cite journal | vauthors = Isaacs JD, Sims HF, Powell CK, Bennett MJ, Hale DE, Treem WR, Strauss AW | title = Maternal acute fatty liver of pregnancy associated with fetal trifunctional protein deficiency: molecular characterization of a novel maternal mutant allele | journal = Pediatric Research | volume = 40 | issue = 3 | date = Sep 1996 | pmid = 8865274 | doi = 10.1203/00006450-199609000-00005 | pages=393–8| doi-access = free }}
* {{cite journal | vauthors = Gillingham MB, Matern D, Harding CO | title = Effect of feeding, exercise and genotype on plasma 3-hydroxyacylcarnitines in children with lchad deficiency | journal = Topics in Clinical Nutrition | volume = 24 | issue = 4 | date = Oct 2009 | pmid = 20589231 | doi = 10.1097/TIN.0b013e3181c62182 | pages=359–365 | pmc=2892921}}
* {{cite journal | vauthors = Milewska M, McRedmond J, Byrne PC | title = Identification of novel spartin-interactors shows spartin is a multifunctional protein | journal = Journal of Neurochemistry | volume = 111 | issue = 4 | date = Nov 2009 | pmid = 19765186 | doi = 10.1111/j.1471-4159.2009.06382.x | pages=1022–30| s2cid = 205621232 }}
* {{cite journal | vauthors = Weekes J, Morrison K, Mullen A, Wait R, Barton P, Dunn MJ | title = Hyperubiquitination of proteins in dilated cardiomyopathy | journal = Proteomics | volume = 3 | issue = 2 | date = Feb 2003 | pmid = 12601813 | doi = 10.1002/pmic.200390029 | pages=208–16| s2cid = 19874662 }}
* {{cite journal | vauthors = Bogenhagen DF, Rousseau D, Burke S | title = The layered structure of human mitochondrial DNA nucleoids | journal = Journal of Biological Chemistry | volume = 283 | issue = 6 | date = Feb 2008 | pmid = 18063578 | doi = 10.1074/jbc.M708444200 | pages=3665–75| doi-access = free }}
* {{cite journal | vauthors = Zhang QX, Baldwin GS | title = Structures of the human cDNA and gene encoding the 78 kDa gastrin-binding protein and of a related pseudogene | journal = Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression | volume = 1219 | issue = 2 | date = Oct 1994 | pmid = 7918661 | pages=567–75 | doi=10.1016/0167-4781(94)90091-4}}
* {{cite journal | vauthors = IJlst L, Oostheim W, Ruiter JP, Wanders RJ | title = Molecular basis of long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency: identification of two new mutations | journal = Journal of Inherited Metabolic Disease | volume = 20 | issue = 3 | date = Jul 1997 | pmid = 9266371 | doi=10.1023/A:1005310903004 | pages=420–2| s2cid = 23046057 | url = http://dare.uva.nl/personal/pure/en/publications/molecular-basis-of-longchain-3hydroxyacylcoa-dehydrogenase-deficiency-identification-of-two-new-mutations(cf89b956-8a1f-4fbf-b408-b09b1dce499e).html }}
* {{cite journal | vauthors = Yagi M, Lee T, Awano H, Tsuji M, Tajima G, Kobayashi H, Hasegawa Y, Yamaguchi S, Takeshima Y, Matsuo M | title = A patient with mitochondrial trifunctional protein deficiency due to the mutations in the HADHB gene showed recurrent myalgia since early childhood and was diagnosed in adolescence | journal = Molecular Genetics and Metabolism | volume = 104 | issue = 4 | date = Dec 2011 | pmid = 22000755 | doi = 10.1016/j.ymgme.2011.09.025 | pages=556–9}}
{{refend}}
== External links ==
* [https://www.ebi.ac.uk/pdbe/pdbe-kb/proteins/P40939 PDBe-KB] provides an overview of all the structure information available in the PDB for Human Trifunctional enzyme subunit alpha, mitochondrial (HADHA)
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{{Multienzyme complexes}}
{{Lipid metabolism enzymes}}
{{Alcohol oxidoreductases}}
{{Enzymes}}
{{Portal bar|Biology|border=no}}
[[Category:EC 1.1.1]]
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