Succinate dehydrogenase complex subunit C

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Succinate dehydrogenase complex subunit C, also known as succinate dehydrogenase cytochrome b560 subunit, mitochondrial, is a protein that in humans is encoded by the SDHC gene.[1] This gene encodes one of four nuclear-encoded subunits that comprise succinate dehydrogenase, also known as mitochondrial complex II, a key enzyme complex of the tricarboxylic acid cycle and aerobic respiratory chains of mitochondria. The encoded protein is one of two integral membrane proteins that anchor other subunits of the complex, which form the catalytic core, to the inner mitochondrial membrane. There are several related pseudogenes for this gene on different chromosomes. Mutations in this gene have been associated with paragangliomas. Alternatively spliced transcript variants have been described.[2]

## Contents

* 1 Structure
* 2 Function
* 3 Clinical significance
* 4 Interactive pathway map
* 5 References
* 6 Further reading
* 7 External links

## Structure

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The gene that codes for the SDHC protein is nuclear, even though the protein is located in the inner membrane of the mitochondria. The location of the gene in humans is on the first chromosome at q21. The gene is partitioned in 6 exons. The SDHC gene produces an 18.6 kDa protein composed of 169 amino acids.[3][4]

The SDHC protein is one of the two transmembrane subunits of the four-subunit succinate dehydrogenase (Complex II) protein complex that resides in the inner mitochondrial membrane. The other transmembrane subunit is SDHD. The SDHC/SDHD dimer is connected to the SDHB electron transport subunit which, in turn, is connected to the SDHA subunit.[5]

## Function

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File:SuccDeh.svg

The SDHC protein is one of four nuclear-encoded subunits that comprise succinate dehydrogenase, also known as Complex II of the electron transport chain, a key enzyme complex of the citric acid cycle and aerobic respiratory chains of mitochondria. The encoded protein is one of two integral membrane proteins that anchor other subunits of the complex, which form the catalytic core, to the inner mitochondrial membrane.[2]

SDHC forms part of the transmembrane protein dimer with SDHD that anchors Complex II to the inner mitochondrial membrane. The SDHC/SDHD dimer provides binding sites for ubiquinone and water during electron transport at Complex II. Initially, SDHA oxidizes succinate via deprotonation at the FAD binding site, forming FADH2 and leaving fumarate, loosely bound to the active site, free to exit the protein. The electrons derived from succinate tunnel along the [Fe-S] relay in the SDHB subunit until they reach the [3Fe-4S] iron sulfur cluster. The electrons are then transferred to an awaiting ubiquinone molecule at the Q pool active site in the SDHC/SDHD dimer. The O1 carbonyl oxygen of ubiquinone is oriented at the active site (image 4) by hydrogen bond interactions with Tyr83 of SDHD. The presence of electrons in the [3Fe-4S] iron sulphur cluster induces the movement of ubiquinone into a second orientation. This facilitates a second hydrogen bond interaction between the O4 carbonyl group of ubiquinone and Ser27 of SDHC. Following the first single electron reduction step, a semiquinone radical species is formed. The second electron arrives from the [3Fe-4S] cluster to provide full reduction of the ubiquinone to ubiquinol.[6]

## Clinical significance

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Mutations in this gene have been associated with paragangliomas.[2][7] More than 30 mutations in the SDHC gene have been found to increase the risk of hereditary paraganglioma-pheochromocytoma type 3. People with this condition have paragangliomas, pheochromocytomas, or both. An inherited SDHC gene mutation predisposes an individual to the condition, and a somatic mutation that deletes the normal copy of the SDHC gene is needed to cause hereditary paraganglioma-pheochromocytoma type 3. Most of the inherited SDHC gene mutations change single amino acids in the SDHC protein sequence or result in a shortened protein. As a result, there is little or no SDH enzyme activity. Because the mutated SDH enzyme cannot convert succinate to fumarate, succinate accumulates in the cell. The excess succinate abnormally stabilizes hypoxia-inducible factors (HIF), which also builds up in cells. Excess HIF stimulates cells to divide and triggers the production of blood vessels when they are not needed. Rapid and uncontrolled cell division, along with the formation of new blood vessels, can lead to the development of tumors in people with hereditary paraganglioma-pheochromocytoma.[8]

## Interactive pathway map

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Click on genes, proteins and metabolites below to link to respective articles. [§ 1]

[[File:

<imagemap> Image:TCACycle WP78.png

<imagemap> Image:TCACycle WP78.png

|{{{bSize}}}px|alt=TCA Cycle edit]]

TCA Cycle edit

1. ↑ The interactive pathway map can be edited at WikiPathways: "TCACycle_WP78".

## References

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1. ↑ Hirawake H, Taniwaki M, Tamura A, Kojima S, Kita K (1997). "Cytochrome b in human complex II (succinate-ubiquinone oxidoreductase): cDNA cloning of the components in liver mitochondria and chromosome assignment of the genes for the large (SDHC) and small (SDHD) subunits to 1q21 and 11q23". Cytogenetics and Cell Genetics. 79 (1–2): 132–8. doi:10.1159/000134700. PMID 9533030.
2. ↑ 2.0 2.1 2.2 "Entrez Gene: succinate dehydrogenase complex".
3. ↑ Zong NC, Li H, Li H, Lam MP, Jimenez RC, Kim CS, Deng N, Kim AK, Choi JH, Zelaya I, Liem D, Meyer D, Odeberg J, Fang C, Lu HJ, Xu T, Weiss J, Duan H, Uhlen M, Yates JR, Apweiler R, Ge J, Hermjakob H, Ping P (October 2013). "Integration of cardiac proteome biology and medicine by a specialized knowledgebase". Circulation Research. 113 (9): 1043–53. doi:10.1161/CIRCRESAHA.113.301151. PMC 4076475. PMID 23965338.
4. ↑ "SDHC - Succinate dehydrogenase cytochrome b560 subunit, mitochondrial". Cardiac Organellar Protein Atlas Knowledgebase (COPaKB).
5. ↑ Sun F, Huo X, Zhai Y, Wang A, Xu J, Su D, Bartlam M, Rao Z (July 2005). "Crystal structure of mitochondrial respiratory membrane protein complex II". Cell. 121 (7): 1043–57. doi:10.1016/j.cell.2005.05.025. PMID 15989954.
6. ↑ Horsefield R, Yankovskaya V, Sexton G, Whittingham W, Shiomi K, Omura S, Byrne B, Cecchini G, Iwata S (March 2006). "Structural and computational analysis of the quinone-binding site of complex II (succinate-ubiquinone oxidoreductase): a mechanism of electron transfer and proton conduction during ubiquinone reduction". The Journal of Biological Chemistry. 281 (11): 7309–16. doi:10.1074/jbc.m508173200. PMID 16407191.
7. ↑ Niemann S, Müller U, Engelhardt D, Lohse P (July 2003). "Autosomal dominant malignant and catecholamine-producing paraganglioma caused by a splice donor site mutation in SDHC". Human Genetics. 113 (1): 92–4. doi:10.1007/s00439-003-0938-0. PMID 12658451.
8. ↑ "SDHC". Genetics Home Reference. U.S. National Library of Medicine. Retrieved 26 March 2015.

## Further reading

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* Bayley JP, Weiss MM, Grimbergen A, van Brussel BT, Hes FJ, Jansen JC, Verhoef S, Devilee P, Corssmit EP, Vriends AH (September 2009). "Molecular characterization of novel germline deletions affecting SDHD and SDHC in pheochromocytoma and paraganglioma patients". Endocrine-Related Cancer. 16 (3): 929–37. doi:10.1677/ERC-09-0084. PMID 19546167.
* Pasini B, McWhinney SR, Bei T, Matyakhina L, Stergiopoulos S, Muchow M, Boikos SA, Ferrando B, Pacak K, Assie G, Baudin E, Chompret A, Ellison JW, Briere JJ, Rustin P, Gimenez-Roqueplo AP, Eng C, Carney JA, Stratakis CA (January 2008). "Clinical and molecular genetics of patients with the Carney-Stratakis syndrome and germline mutations of the genes coding for the succinate dehydrogenase subunits SDHB, SDHC, and SDHD". European Journal of Human Genetics. 16 (1): 79–88. doi:10.1038/sj.ejhg.5201904. PMID 17667967.
* Gaal J, Burnichon N, Korpershoek E, Roncelin I, Bertherat J, Plouin PF, de Krijger RR, Gimenez-Roqueplo AP, Dinjens WN (March 2010). "Isocitrate dehydrogenase mutations are rare in pheochromocytomas and paragangliomas". The Journal of Clinical Endocrinology and Metabolism. 95 (3): 1274–8. doi:10.1210/jc.2009-2170. PMID 19915015.
* Milosevic D, Lundquist P, Cradic K, Vidal-Folch N, Huynh T, Pacak K, Grebe SK (May 2010). "Development and validation of a comprehensive mutation and deletion detection assay for SDHB, SDHC, and SDHD". Clinical Biochemistry. 43 (7–8): 700–4. doi:10.1016/j.clinbiochem.2010.01.016. PMC 3419008. PMID 20153743.
* Bonache S, Martínez J, Fernández M, Bassas L, Larriba S (June 2007). "Single nucleotide polymorphisms in succinate dehydrogenase subunits and citrate synthase genes: association results for impaired spermatogenesis". International Journal of Andrology. 30 (3): 144–52. doi:10.1111/j.1365-2605.2006.00730.x. PMID 17298551.
* Cascón A, López-Jiménez E, Landa I, Leskelä S, Leandro-García LJ, Maliszewska A, Letón R, de la Vega L, García-Barcina MJ, Sanabria C, Alvarez-Escolá C, Rodríguez-Antona C, Robledo M (September 2009). "Rationalization of genetic testing in patients with apparently sporadic pheochromocytoma/paraganglioma". Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme. 41 (9): 672–5. doi:10.1055/s-0029-1202814. PMID 19343621.
* Goto Y, Ando T, Naito M, Goto H, Hamajima N (2006). "No association of an SDHC gene polymorphism with gastric cancer". Asian Pacific Journal of Cancer Prevention. 7 (4): 525–8. PMID 17250422.
* Cascón A, Pita G, Burnichon N, Landa I, López-Jiménez E, Montero-Conde C, Leskelä S, Leandro-García LJ, Letón R, Rodríguez-Antona C, Díaz JA, López-Vidriero E, González-Neira A, Velasco A, Matias-Guiu X, Gimenez-Roqueplo AP, Robledo M (May 2009). "Genetics of pheochromocytoma and paraganglioma in Spanish patients". The Journal of Clinical Endocrinology and Metabolism. 94 (5): 1701–5. doi:10.1210/jc.2008-2756. PMID 19258401.
* Boedeker CC, Neumann HP, Maier W, Bausch B, Schipper J, Ridder GJ (July 2007). "Malignant head and neck paragangliomas in SDHB mutation carriers". Otolaryngology–Head and Neck Surgery. 137 (1): 126–9. doi:10.1016/j.otohns.2007.01.015. PMID 17599579.
* Gill AJ, Benn DE, Chou A, Clarkson A, Muljono A, Meyer-Rochow GY, Richardson AL, Sidhu SB, Robinson BG, Clifton-Bligh RJ (June 2010). "Immunohistochemistry for SDHB triages genetic testing of SDHB, SDHC, and SDHD in paraganglioma-pheochromocytoma syndromes". Human Pathology. 41 (6): 805–14. doi:10.1016/j.humpath.2009.12.005. PMID 20236688.
* Ricketts C, Woodward ER, Killick P, Morris MR, Astuti D, Latif F, Maher ER (September 2008). "Germline SDHB mutations and familial renal cell carcinoma". Journal of the National Cancer Institute. 100 (17): 1260–2. doi:10.1093/jnci/djn254. PMID 18728283.
* McWhinney SR, Pasini B, Stratakis CA (September 2007). "Familial gastrointestinal stromal tumors and germ-line mutations". The New England Journal of Medicine. 357 (10): 1054–6. doi:10.1056/NEJMc071191. PMID 17804857.
* Eng C, Kiuru M, Fernandez MJ, Aaltonen LA (March 2003). "A role for mitochondrial enzymes in inherited neoplasia and beyond". Nature Reviews. Cancer. 3 (3): 193–202. doi:10.1038/nrc1013. PMID 12612654.
* Hermsen MA, Sevilla MA, Llorente JL, Weiss MM, Grimbergen A, Allonca E, Garcia-Inclán C, Balbín M, Suárez C (January 2010). "Relevance of germline mutation screening in both familial and sporadic head and neck paraganglioma for early diagnosis and clinical management". Cellular Oncology. 32 (4): 275–83. doi:10.3233/CLO-2009-0498. PMID 20208144.
* Brière JJ, Favier J, El Ghouzzi V, Djouadi F, Bénit P, Gimenez AP, Rustin P (October 2005). "Succinate dehydrogenase deficiency in human". Cellular and Molecular Life Sciences. 62 (19–20): 2317–24. doi:10.1007/s00018-005-5237-6. PMID 16143825.
* Mannelli M, Castellano M, Schiavi F, Filetti S, Giacchè M, Mori L, Pignataro V, Bernini G, Giachè V, Bacca A, Biondi B, Corona G, Di Trapani G, Grossrubatscher E, Reimondo G, Arnaldi G, Giacchetti G, Veglio F, Loli P, Colao A, Ambrosio MR, Terzolo M, Letizia C, Ercolino T, Opocher G (May 2009). "Clinically guided genetic screening in a large cohort of italian patients with pheochromocytomas and/or functional or nonfunctional paragangliomas". The Journal of Clinical Endocrinology and Metabolism. 94 (5): 1541–7. doi:10.1210/jc.2008-2419. PMID 19223516.
* Richalet JP, Gimenez-Roqueplo AP, Peyrard S, Vénisse A, Marelle L, Burnichon N, Bouzamondo A, Jeunemaitre X, Azizi M, Elghozi JL (December 2009). "A role for succinate dehydrogenase genes in low chemoresponsiveness to hypoxia?". Clinical Autonomic Research. 19 (6): 335–42. doi:10.1007/s10286-009-0028-z. PMID 19768395.
* Pigny P, Cardot-Bauters C, Do Cao C, Vantyghem MC, Carnaille B, Pattou F, Caron P, Wemeau JL, Porchet N (February 2009). "Should genetic testing be performed in each patient with sporadic pheochromocytoma at presentation?". European Journal of Endocrinology. 160 (2): 227–31. doi:10.1530/EJE-08-0574. PMID 19029228.
* Korpershoek E, Van Nederveen FH, Dannenberg H, Petri BJ, Komminoth P, Perren A, Lenders JW, Verhofstad AA, De Herder WW, De Krijger RR, Dinjens WN (August 2006). "Genetic analyses of apparently sporadic pheochromocytomas: the Rotterdam experience". Annals of the New York Academy of Sciences. 1073: 138–48. doi:10.1196/annals.1353.014. PMID 17102080.
* Wang L, McDonnell SK, Hebbring SJ, Cunningham JM, St Sauver J, Cerhan JR, Isaya G, Schaid DJ, Thibodeau SN (December 2008). "Polymorphisms in mitochondrial genes and prostate cancer risk". Cancer Epidemiology, Biomarkers & Prevention. 17 (12): 3558–66. doi:10.1158/1055-9965.EPI-08-0434. PMC 2750891. PMID 19064571.

## External links

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* GeneReviews/NCBI/NIH/UW entry on Hereditary Paraganglioma-Pheochromocytoma Syndromes

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

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PDB gallery

* 1zp0: Crystal Structure of Mitochondrial Respiratory Complex II bound with 3-nitropropionate and 2-thenoyltrifluoroacetone

1zp0: Crystal Structure of Mitochondrial Respiratory Complex II bound with 3-nitropropionate and 2-thenoyltrifluoroacetone

* 1zoy: Crystal Structure of Mitochondrial Respiratory Complex II from porcine heart at 2.4 Angstroms

1zoy: Crystal Structure of Mitochondrial Respiratory Complex II from porcine heart at 2.4 Angstroms

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Metabolism: Citric acid cycle enzymes

Cycle|

* Citrate synthase
* Aconitase
* Isocitrate dehydrogenase
* Oxoglutarate dehydrogenase
* Succinyl CoA synthetase

* Succinate dehydrogenase (SDHA)
* Fumarase
* Malate dehydrogenase and ETC

Anaplerotic|

| to acetyl-CoA|

* Pyruvate dehydrogenase complex (E1, E2, E3)

* (regulated by Pyruvate dehydrogenase kinase and Pyruvate dehydrogenase phosphatase)

|

to α-ketoglutaric acid|

* Glutamate dehydrogenase

to succinyl-CoA|

* Methylmalonyl-CoA mutase

to oxaloacetate|

* Pyruvate carboxylase
* Aspartate transaminase

Mitochondrial
electron transport chain/
oxidative phosphorylation|

| Primary|

* Complex I/NADH dehydrogenase
* Complex II/Succinate dehydrogenase
* Coenzyme Q
* Complex III/Coenzyme Q - cytochrome c reductase
* Cytochrome c
* Complex IV/Cytochrome c oxidase

* Coenzyme Q10 synthesis: COQ2
* COQ3
* COQ4
* COQ5
* COQ6
* COQ7
* COQ9
* COQ10A
* COQ10B
* PDSS1
* PDSS2

|

Other|

* Alternative oxidase
* Electron-transferring-flavoprotein dehydrogenase

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Oxidoreductases: CH–CH oxidoreductases (EC 1.3)

1.3.1: NAD/NADP acceptor|

* Enoyl-acyl carrier protein reductase/Enoyl ACP reductase
* 7-Dehydrocholesterol reductase
* Biliverdin reductase
* 2,4 Dienoyl-CoA reductase
* Dihydroxymethyloxo-tetrahydroquinoline dehydrogenase

1.3.3: Oxygen acceptor|

* Dihydroorotate dehydrogenase
* Coproporphyrinogen III oxidase
* Protoporphyrinogen oxidase
* Bilirubin oxidase
* Acyl-CoA oxidase
* Dihydrouracil oxidase
* Tetrahydroberberine oxidase
* Secologanin synthase
* Tryptophan alpha,beta-oxidase
* Pyrroloquinoline-quinone synthase
* L-galactonolactone oxidase

1.3.5: Quinone|

* Succinate dehydrogenase
* SDHA
* SDHB
* SDHC
* SDHD

1.3.99: Other acceptors|

* Fumarate reductase
* Butyryl-CoA dehydrogenase
* Acyl CoA dehydrogenase
* ACADSB
* ACADS
* 5α-reductase
* SRD5A1
* SRD5A2
* SRD5A3
* Glutaryl-CoA dehydrogenase
* Isovaleryl coenzyme A dehydrogenase
* 3-oxo-5beta-steroid 4-dehydrogenase

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Enzymes

Activity|

* Active site
* Binding site
* Catalytic triad
* Oxyanion hole
* Enzyme promiscuity
* Catalytically perfect enzyme
* Coenzyme
* Cofactor
* Enzyme catalysis

Regulation|

* Allosteric regulation
* Cooperativity
* Enzyme inhibitor
* Enzyme activator

Classification|

* EC number
* Enzyme superfamily
* Enzyme family
* List of enzymes

Kinetics|

* Enzyme kinetics
* Eadie–Hofstee diagram
* Hanes–Woolf plot
* Lineweaver–Burk plot
* Michaelis–Menten kinetics

Types|

* EC1 Oxidoreductases (list)
* EC2 Transferases (list)
* EC3 Hydrolases (list)
* EC4 Lyases (list)
* EC5 Isomerases (list)
* EC6 Ligases (list)

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