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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.
== 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.
== Clinical significance ==
Mutations in this gene result in trifunctional protein deficiency or [[long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency]]
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 |
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 |
==
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>
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== Further reading ==
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* {{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}}
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== 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)
{{NLM content}}
{{Multienzyme complexes}}
{{Lipid metabolism enzymes}}
{{Alcohol oxidoreductases}}
{{Enzymes}}
{{Portal bar|Biology|border=no}}
[[Category:EC 1.1.1]]
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