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{{Orphan|date=February 2009}}
{{cs1 config|name-list-style=vanc}}
{{PBB|geneid=1537}}
{{Infobox_gene}}
'''Cytochrome c1, heme protein, mitochondrial''' is a [[protein]] that in humans is encoded by the ''CYC1'' [[gene]].<ref name="entrez">{{cite web | title = Entrez Gene: CYC1 cytochrome c-1| url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=1537| accessdate = }}</ref>
'''Cytochrome c1, heme protein, mitochondrial (CYC1),''' also known as '''UQCR4, MC3DN6, Complex III subunit 4, Cytochrome b-c1 complex subunit 4,''' or '''Ubiquinol-cytochrome-c reductase complex cytochrome c1 subunit''' is a [[protein]] that in humans is encoded by the ''CYC1'' [[gene]]. CYC1 is a respiratory [[Protein subunit|subunit]] of [[ubiquinol-cytochrome-c reductase|Ubiquinol Cytochrome c Reductase]] ([[Coenzyme Q – cytochrome c reductase|complex III]]), which is located in the [[inner mitochondrial membrane]] and is part of the [[electron transport chain]]. Mutations in this gene may cause mitochondrial complex III deficiency, nuclear, type 6.<ref name="entrez">{{cite web | title = Entrez Gene: CYC1 cytochrome c-1| url = https://www.ncbi.nlm.nih.gov/gene?Db=gene&Cmd=ShowDetailView&TermToSearch=1537}}</ref><ref name=":0">{{Cite web|url=https://www.uniprot.org/uniprot/P08574|title=CYC1 - Cytochrome c1, heme protein, mitochondrial precursor - Homo sapiens (Human) - CYC1 gene & protein|website=www.uniprot.org|language=en|access-date=2018-07-31}}</ref><ref name=":3">{{cite journal | title = UniProt: the universal protein knowledgebase | journal = Nucleic Acids Research | volume = 45 | issue = D1 | pages = D158–D169 | date = January 2017 | pmid = 27899622 | pmc = 5210571 | doi = 10.1093/nar/gkw1099 }}</ref>


<!-- The PBB_Summary template is automatically maintained by Protein Box Bot. See Template:PBB_Controls to Stop updates. -->
== Structure ==
{{PBB_Summary
''CYC1'' is located on the [[Locus (genetics)|q arm]] of [[chromosome 8]] in position 24.3 and has 8 [[exon]]s.<ref name="entrez" /> The ''CYC1'' gene produces a 13.5 kDa protein composed of 130 [[amino acid]]s.<ref>{{Cite web|url=https://amino.heartproteome.org/web/protein/E0CYC1|title=Cardiac Organellar Protein Atlas Knowledgebase (COPaKB) —— Protein Information|last=Yao|first=Daniel|website=amino.heartproteome.org|access-date=2018-07-31|archive-url=https://web.archive.org/web/20180801034501/https://amino.heartproteome.org/web/protein/E0CYC1|archive-date=2018-08-01|url-status=dead}}</ref><ref>{{cite journal | vauthors = 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 | title = Integration of cardiac proteome biology and medicine by a specialized knowledgebase | journal = Circulation Research | volume = 113 | issue = 9 | pages = 1043–53 | date = October 2013 | pmid = 23965338 | pmc = 4076475 | doi = 10.1161/CIRCRESAHA.113.301151 }}</ref> ''CYC1'' belongs to the [[cytochrome c family]]. CYC1 is a [[phosphoprotein]] and subunit of [[ubiquinol-cytochrome-c reductase|Ubiquinol Cytochrome c Reductase]] that binds [[heme]] groups. It has [[Alpha helix|helix]], [[Signal peptide|transit peptide]], and [[Transmembrane domain|transmembrane]] domains and contains 9 [[alpha helix]]es, 5 [[Beta sheet|beta strands]], and 3 turns. The transmembrane protein passes through the [[inner mitochondrial membrane]] once and the majority of the protein is found on the [[Mitochondrial intermembrane space|intermembrane]] side. CYC1 contains [[Covalent bond|covalent]] heme bindings sites at positions 121 and 124 and heme axial [[ligand]] [[Iron-binding proteins|iron-metal binding sites]] at positions 125 and 244.<ref name=":0" /><ref name=":3" />
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==References==
== Function ==
''CYC1'' encodes a protein that is located in the [[inner mitochondrial membrane]] and is part of [[ubiquinol-cytochrome-c reductase|Ubiquinol Cytochrome c Reductase]] ([[Coenzyme Q – cytochrome c reductase|complex III]]). The encoded protein, CYC1, is a respiratory [[Protein subunit|subunit]] of the [[Coenzyme Q – cytochrome c reductase|cytochrome bc1 complex]], which plays an important role in the [[Electron transport chain|mitochondrial respiratory chain]] by transferring [[electron]]s from the [[Rieske protein|Rieske]] iron-sulfur protein to [[cytochrome c]].<ref name="entrez" /><ref name=":0" /><ref name=":3" />
 
== Species ==
''CYC1'' is a human gene that is [[Conserved sequence|conserved]] in [[Common chimpanzee|chimpanzee]], [[Rhesus monkey]], dog, cow, mouse, rat, [[zebrafish]], [[Drosophila melanogaster|fruit fly]], mosquito, [[Caenorhabditis elegans|''C. elegans'']], ''[[S. cerevisiae]],'' ''[[K.lactis|K. lactis]]'', ''[[E. gossypii]]'', ''[[S. pombe]]'', ''[[N. crassa]]'', ''[[A. thaliana]]'', rice, and frog.<ref>{{Cite web|url=https://www.ncbi.nlm.nih.gov/gene/1537|title=CYC1 cytochrome c1 [Homo sapiens (human)]|website=National Center for Biotechnology Information|publisher=U.S. National Library of Medicine|access-date=2016-07-29}}</ref> There are [[orthologs]] of CYC1 in 137 known organisms.<ref>{{Cite web|url=https://www.ncbi.nlm.nih.gov/gene/?Term=ortholog_gene_1537%5Bgroup%5D|title=ortholog_gene_1537[group]|website=National Center for Biotechnology Information|publisher=U.S. National Library of Medicine|access-date=2016-07-29}}</ref>
 
== Clinical Significance ==
Variants of ''CYC1'' have been associated with mitochondrial complex III deficiency, nuclear, type 6. Mitochondrial complex III deficiency, nuclear, type 6 is an [[Dominance (genetics)|autosomal recessive]] disorder of the mitochondrial respiratory chain resulting from a defect in [[ubiquinol-cytochrome-c reductase|Ubiquinol Cytochrome c Reductase]] (complex III) that leads to reduced complex III activity. Clinical features tend to emerge in early childhood and include episodic acute [[lactic acidosis]], [[ketoacidosis]], [[insulin]]-responsive [[hyperglycemia]], [[Liver disease|liver dysfunction]], [[encephalopathy]], and associated infection, although psychomotor development may remain normal. Pathogenic mutations have included c.288G>T, p.Trp96Cys and c.643C>T p.&nbsp;Leu215Phe.<ref name=":0" /><ref name=":3" /><ref>{{cite journal | vauthors = Gaignard P, Menezes M, Schiff M, Bayot A, Rak M, Ogier de Baulny H, Su CH, Gilleron M, Lombes A, Abida H, Tzagoloff A, Riley L, Cooper ST, Mina K, Sivadorai P, Davis MR, Allcock RJ, Kresoje N, Laing NG, Thorburn DR, Slama A, Christodoulou J, Rustin P | title = Mutations in CYC1, encoding cytochrome c1 subunit of respiratory chain complex III, cause insulin-responsive hyperglycemia | journal = American Journal of Human Genetics | volume = 93 | issue = 2 | pages = 384–9 | date = August 2013 | pmid = 23910460 | pmc = 3738829 | doi = 10.1016/j.ajhg.2013.06.015 }}</ref>
 
== Interactions ==
CYC1 has 78 protein-protein interactions with 72 of them being co-complex interactions.<ref name=":1">{{cite web | url = https://www.ebi.ac.uk/intact/interactions?conversationContext=3&query=CYC1 | title = 81 binary interactions found for search term CYC1 | work = IntAct Molecular Interaction Database | publisher = EMBL-EBI | access-date = 2018-08-25 }}</ref> CYC1 is one of 11 subunits of [[ubiquinol-cytochrome-c reductase|Ubiquinol Cytochrome c Reductase]] (b1-c complex) that includes the respiratory subunits [[cytochrome b]], [[Cytochrome C1|cytochrome c1]] (CYC1), [[UQCRFS1]], the core proteins [[UQCRC1]] and [[UQCRC2]], and the low-molecular weight proteins [[UQCRH]], [[UQCRB]], [[UQCRQ]], [[UQCR10 (gene)|UQCR10]], [[UQCR11]], as well as an additional cleavage product of UQCRFS1.<ref name=":0" /><ref name=":3" /> Additionally, CCP1, CDKA-1, and CDKB1-1 have also been found to interact with CYC1.<ref name=":1" />
 
== References ==
{{reflist}}
{{reflist}}
==Further reading==
 
== External links ==
* {{UCSC gene info|CYC1}}
 
== Further reading ==
{{refbegin | 2}}
{{refbegin | 2}}
{{PBB_Further_reading
* {{cite journal | vauthors = Moon HS, Yang JS | title = Role of HIV Vpr as a regulator of apoptosis and an effector on bystander cells | journal = Molecules and Cells | volume = 21 | issue = 1 | pages = 7–20 | date = February 2006 | doi = 10.1016/s1016-8478(23)12897-4 | pmid = 16511342 | doi-access = free }}
| citations =
* {{cite journal | vauthors = Suzuki H, Hosokawa Y, Nishikimi M, Ozawa T | title = Structural organization of the human mitochondrial cytochrome c1 gene | journal = The Journal of Biological Chemistry | volume = 264 | issue = 3 | pages = 1368–74 | date = January 1989 | doi = 10.1016/S0021-9258(18)94196-7 | pmid = 2536365 | doi-access = free }}
*{{cite journal | author=Moon HS, Yang JS |title=Role of HIV Vpr as a regulator of apoptosis and an effector on bystander cells. |journal=Mol. Cells |volume=21 |issue= 1 |pages= 7–20 |year= 2006 |pmid= 16511342 |doi= }}
* {{cite journal | vauthors = Nishikimi M, Ohta S, Suzuki H, Tanaka T, Kikkawa F, Tanaka M, Kagawa Y, Ozawa T | title = Nucleotide sequence of a cDNA encoding the precursor to human cytochrome c1 | journal = Nucleic Acids Research | volume = 16 | issue = 8 | pages = 3577 | date = April 1988 | pmid = 2836796 | pmc = 336517 | doi = 10.1093/nar/16.8.3577 }}
*{{cite journal | author=Suzuki H, Hosokawa Y, Nishikimi M, Ozawa T |title=Structural organization of the human mitochondrial cytochrome c1 gene. |journal=J. Biol. Chem. |volume=264 |issue= 3 |pages= 1368–74 |year= 1989 |pmid= 2536365 |doi= }}
* {{cite journal | vauthors = Tanaka Y, Ashikari T, Shibano Y, Amachi T, Yoshizumi H, Matsubara H | title = Construction of a human cytochrome c gene and its functional expression in Saccharomyces cerevisiae | journal = Journal of Biochemistry | volume = 103 | issue = 6 | pages = 954–61 | date = June 1988 | pmid = 2844747 | doi =  10.1093/oxfordjournals.jbchem.a122393| doi-access = free }}
*{{cite journal | author=Nishikimi M, Ohta S, Suzuki H, ''et al.'' |title=Nucleotide sequence of a cDNA encoding the precursor to human cytochrome c1 |journal=Nucleic Acids Res. |volume=16 |issue= 8 |pages= 3577 |year= 1988 |pmid= 2836796 |doi=10.1093/nar/16.8.3577 | pmc=336517  }}
* {{cite journal | vauthors = Shimomura Y, Nishikimi M, Ozawa T | title = Novel purification of cytochrome c1 from mitochondrial Complex III. Reconstitution of antimycin-insensitive electron transfer with the iron-sulfur protein and cytochrome c1 | journal = The Journal of Biological Chemistry | volume = 260 | issue = 28 | pages = 15075–80 | date = December 1985 | doi = 10.1016/S0021-9258(18)95704-2 | pmid = 2999105 | doi-access = free }}
*{{cite journal | author=Tanaka Y, Ashikari T, Shibano Y, ''et al.'' |title=Construction of a human cytochrome c gene and its functional expression in Saccharomyces cerevisiae |journal=J. Biochem. |volume=103 |issue= 6 |pages= 954–61 |year= 1988 |pmid= 2844747 |doi=  }}
* {{cite journal | vauthors = Nishikimi M, Suzuki H, Ohta S, Sakurai T, Shimomura Y, Tanaka M, Kagawa Y, Ozawa T | title = Isolation of a cDNA clone for human cytochrome c1 from a lambda gt11 expression library | journal = Biochemical and Biophysical Research Communications | volume = 145 | issue = 1 | pages = 34–9 | date = May 1987 | pmid = 3036122 | doi = 10.1016/0006-291X(87)91283-6 }}
*{{cite journal | author=Shimomura Y, Nishikimi M, Ozawa T |title=Novel purification of cytochrome c1 from mitochondrial Complex III. Reconstitution of antimycin-insensitive electron transfer with the iron-sulfur protein and cytochrome c1 |journal=J. Biol. Chem. |volume=260 |issue= 28 |pages= 15075–80 |year= 1986 |pmid= 2999105 |doi= }}
* {{cite journal | vauthors = Smith HT, Ahmed AJ, Millett F | title = Electrostatic interaction of cytochrome c with cytochrome c1 and cytochrome oxidase | journal = The Journal of Biological Chemistry | volume = 256 | issue = 10 | pages = 4984–90 | date = May 1981 | doi = 10.1016/S0021-9258(19)69355-5 | pmid = 6262312 | doi-access = free }}
*{{cite journal | author=Nishikimi M, Suzuki H, Ohta S, ''et al.'' |title=Isolation of a cDNA clone for human cytochrome c1 from a lambda gt11 expression library |journal=Biochem. Biophys. Res. Commun. |volume=145 |issue= 1 |pages= 34–9 |year= 1987 |pmid= 3036122 |doi=10.1016/0006-291X(87)91283-6 }}
* {{cite journal | vauthors = Maruyama K, Sugano S | title = Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides | journal = Gene | volume = 138 | issue = 1–2 | pages = 171–4 | date = January 1994 | pmid = 8125298 | doi = 10.1016/0378-1119(94)90802-8 }}
*{{cite journal | author=Smith HT, Ahmed AJ, Millett F |title=Electrostatic interaction of cytochrome c with cytochrome c1 and cytochrome oxidase |journal=J. Biol. Chem. |volume=256 |issue= 10 |pages= 4984–90 |year= 1981 |pmid= 6262312 |doi= }}
* {{cite journal | vauthors = Duncan AM, Ozawa T, Suzuki H, Rozen R | title = Assignment of the gene for the cytochrome c1 subunit of the mitochondrial cytochrome bc1 complex (CYC1) to human chromosome 8q24.3 | journal = Genomics | volume = 19 | issue = 2 | pages = 400–1 | date = January 1994 | pmid = 8188279 | doi = 10.1006/geno.1994.1084 }}
*{{cite journal | author=Maruyama K, Sugano S |title=Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides |journal=Gene |volume=138 |issue= 1–2 |pages= 171–4 |year= 1994 |pmid= 8125298 |doi=10.1016/0378-1119(94)90802-8 }}
* {{cite journal | vauthors = Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S | title = Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library | journal = Gene | volume = 200 | issue = 1–2 | pages = 149–56 | date = October 1997 | pmid = 9373149 | doi = 10.1016/S0378-1119(97)00411-3 }}
*{{cite journal | author=Duncan AM, Ozawa T, Suzuki H, Rozen R |title=Assignment of the gene for the cytochrome c1 subunit of the mitochondrial cytochrome bc1 complex (CYC1) to human chromosome 8q24.3 |journal=Genomics |volume=19 |issue= 2 |pages= 400–1 |year= 1994 |pmid= 8188279 |doi= 10.1006/geno.1994.1084 }}
* {{cite journal | vauthors = Valnot I, Kassis J, Chretien D, de Lonlay P, Parfait B, Munnich A, Kachaner J, Rustin P, Rötig A | title = A mitochondrial cytochrome b mutation but no mutations of nuclearly encoded subunits in ubiquinol cytochrome c reductase (complex III) deficiency | journal = Human Genetics | volume = 104 | issue = 6 | pages = 460–6 | date = June 1999 | pmid = 10453733 | doi = 10.1007/s004390050988 | s2cid = 30584267 }}
*{{cite journal | author=Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, ''et al.'' |title=Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library |journal=Gene |volume=200 |issue= 1–2 |pages= 149–56 |year= 1997 |pmid= 9373149 |doi=10.1016/S0378-1119(97)00411-3 }}
* {{cite journal | vauthors = Jacotot E, Ferri KF, El Hamel C, Brenner C, Druillennec S, Hoebeke J, Rustin P, Métivier D, Lenoir C, Geuskens M, Vieira HL, Loeffler M, Belzacq AS, Briand JP, Zamzami N, Edelman L, Xie ZH, Reed JC, Roques BP, Kroemer G | title = Control of mitochondrial membrane permeabilization by adenine nucleotide translocator interacting with HIV-1 viral protein rR and Bcl-2 | journal = The Journal of Experimental Medicine | volume = 193 | issue = 4 | pages = 509–19 | date = February 2001 | pmid = 11181702 | pmc = 2195906 | doi = 10.1084/jem.193.4.509 }}
*{{cite journal | author=Valnot I, Kassis J, Chretien D, ''et al.'' |title=A mitochondrial cytochrome b mutation but no mutations of nuclearly encoded subunits in ubiquinol cytochrome c reductase (complex III) deficiency |journal=Hum. Genet. |volume=104 |issue= 6 |pages= 460–6 |year= 1999 |pmid= 10453733 |doi=10.1007/s004390050988 }}
* {{cite journal | vauthors = Tafani M, Karpinich NO, Hurster KA, Pastorino JG, Schneider T, Russo MA, Farber JL | title = Cytochrome c release upon Fas receptor activation depends on translocation of full-length bid and the induction of the mitochondrial permeability transition | journal = The Journal of Biological Chemistry | volume = 277 | issue = 12 | pages = 10073–82 | date = March 2002 | pmid = 11790791 | doi = 10.1074/jbc.M111350200 | doi-access = free }}
*{{cite journal | author=Jacotot E, Ferri KF, El Hamel C, ''et al.'' |title=Control of Mitochondrial Membrane Permeabilization by Adenine Nucleotide Translocator Interacting with HIV-1 Viral Protein R and Bcl-2 |journal=J. Exp. Med. |volume=193 |issue= 4 |pages= 509–19 |year= 2001 |pmid= 11181702 |doi=10.1084/jem.193.4.509 | pmc=2195906  }}
* {{cite journal | vauthors = Muthumani K, Hwang DS, Desai BM, Zhang D, Dayes N, Green DR, Weiner DB | title = HIV-1 Vpr induces apoptosis through caspase 9 in T cells and peripheral blood mononuclear cells | journal = The Journal of Biological Chemistry | volume = 277 | issue = 40 | pages = 37820–31 | date = October 2002 | pmid = 12095993 | doi = 10.1074/jbc.M205313200 | doi-access = free }}
*{{cite journal | author=Tafani M, Karpinich NO, Hurster KA, ''et al.'' |title=Cytochrome c release upon Fas receptor activation depends on translocation of full-length bid and the induction of the mitochondrial permeability transition |journal=J. Biol. Chem. |volume=277 |issue= 12 |pages= 10073–82 |year= 2002 |pmid= 11790791 |doi= 10.1074/jbc.M111350200 }}
* {{cite journal | vauthors = Muthumani K, Zhang D, Hwang DS, Kudchodkar S, Dayes NS, Desai BM, Malik AS, Yang JS, Chattergoon MA, Maguire HC, Weiner DB | title = Adenovirus encoding HIV-1 Vpr activates caspase 9 and induces apoptotic cell death in both p53 positive and negative human tumor cell lines | journal = Oncogene | volume = 21 | issue = 30 | pages = 4613–25 | date = July 2002 | pmid = 12096338 | doi = 10.1038/sj.onc.1205549 | doi-access = free }}
*{{cite journal | author=Muthumani K, Hwang DS, Desai BM, ''et al.'' |title=HIV-1 Vpr induces apoptosis through caspase 9 in T cells and peripheral blood mononuclear cells |journal=J. Biol. Chem. |volume=277 |issue= 40 |pages= 37820–31 |year= 2002 |pmid= 12095993 |doi= 10.1074/jbc.M205313200 }}
* {{cite journal | vauthors = Brenner C, Kroemer G | title = The mitochondriotoxic domain of Vpr determines HIV-1 virulence | journal = The Journal of Clinical Investigation | volume = 111 | issue = 10 | pages = 1455–7 | date = May 2003 | pmid = 12750393 | pmc = 155055 | doi = 10.1172/JCI18609 }}
*{{cite journal | author=Muthumani K, Zhang D, Hwang DS, ''et al.'' |title=Adenovirus encoding HIV-1 Vpr activates caspase 9 and induces apoptotic cell death in both p53 positive and negative human tumor cell lines |journal=Oncogene |volume=21 |issue= 30 |pages= 4613–25 |year= 2002 |pmid= 12096338 |doi= 10.1038/sj.onc.1205549 }}
* {{cite journal | vauthors = Lum JJ, Cohen OJ, Nie Z, Weaver JG, Gomez TS, Yao XJ, Lynch D, Pilon AA, Hawley N, Kim JE, Chen Z, Montpetit M, Sanchez-Dardon J, Cohen EA, Badley AD | title = Vpr R77Q is associated with long-term nonprogressive HIV infection and impaired induction of apoptosis | journal = The Journal of Clinical Investigation | volume = 111 | issue = 10 | pages = 1547–54 | date = May 2003 | pmid = 12750404 | pmc = 155040 | doi = 10.1172/JCI16233 }}
*{{cite journal | author=Strausberg RL, Feingold EA, Grouse LH, ''et al.'' |title=Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=99 |issue= 26 |pages= 16899–903 |year= 2003 |pmid= 12477932 |doi= 10.1073/pnas.242603899  | pmc=139241 }}
* {{cite journal | vauthors = Yuan J, Murrell GA, Trickett A, Wang MX | title = Involvement of cytochrome c release and caspase-3 activation in the oxidative stress-induced apoptosis in human tendon fibroblasts | journal = Biochimica et Biophysica Acta (BBA) - Molecular Cell Research | volume = 1641 | issue = 1 | pages = 35–41 | date = June 2003 | pmid = 12788227 | doi = 10.1016/S0167-4889(03)00047-8 | doi-access = free }}
*{{cite journal | author=Brenner C, Kroemer G |title=The mitochondriotoxic domain of Vpr determines HIV-1 virulence |journal=J. Clin. Invest. |volume=111 |issue= 10 |pages= 1455–7 |year= 2003 |pmid= 12750393 |doi=10.1172/JCI18609  | pmc=155055  }}
* {{cite journal | vauthors = An J, Chen Y, Huang Z | title = Critical upstream signals of cytochrome C release induced by a novel Bcl-2 inhibitor | journal = The Journal of Biological Chemistry | volume = 279 | issue = 18 | pages = 19133–40 | date = April 2004 | pmid = 14966123 | doi = 10.1074/jbc.M400295200 | doi-access = free }}
*{{cite journal | author=Lum JJ, Cohen OJ, Nie Z, ''et al.'' |title=Vpr R77Q is associated with long-term nonprogressive HIV infection and impaired induction of apoptosis |journal=J. Clin. Invest. |volume=111 |issue= 10 |pages= 1547–54 |year= 2003 |pmid= 12750404 |doi=10.1172/JCI16233  | pmc=155040  }}
*{{cite journal | author=Yuan J, Murrell GA, Trickett A, Wang MX |title=Involvement of cytochrome c release and caspase-3 activation in the oxidative stress-induced apoptosis in human tendon fibroblasts |journal=Biochim. Biophys. Acta |volume=1641 |issue= 1 |pages= 35–41 |year= 2003 |pmid= 12788227 |doi=10.1016/S0167-4889(03)00047-8  }}
*{{cite journal  | author=An J, Chen Y, Huang Z |title=Critical upstream signals of cytochrome C release induced by a novel Bcl-2 inhibitor |journal=J. Biol. Chem. |volume=279 |issue= 18 |pages= 19133–40 |year= 2004 |pmid= 14966123 |doi= 10.1074/jbc.M400295200 }}
}}
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{{PDB Gallery|geneid=1537}}


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Latest revision as of 16:47, 1 October 2026

Template:Cs1 config Template:Infobox gene Cytochrome c1, heme protein, mitochondrial (CYC1), also known as UQCR4, MC3DN6, Complex III subunit 4, Cytochrome b-c1 complex subunit 4, or Ubiquinol-cytochrome-c reductase complex cytochrome c1 subunit is a protein that in humans is encoded by the CYC1 gene. CYC1 is a respiratory subunit of Ubiquinol Cytochrome c Reductase (complex III), which is located in the inner mitochondrial membrane and is part of the electron transport chain. Mutations in this gene may cause mitochondrial complex III deficiency, nuclear, type 6.[1][2][3]

Structure

CYC1 is located on the q arm of chromosome 8 in position 24.3 and has 8 exons.[1] The CYC1 gene produces a 13.5 kDa protein composed of 130 amino acids.[4][5] CYC1 belongs to the cytochrome c family. CYC1 is a phosphoprotein and subunit of Ubiquinol Cytochrome c Reductase that binds heme groups. It has helix, transit peptide, and transmembrane domains and contains 9 alpha helixes, 5 beta strands, and 3 turns. The transmembrane protein passes through the inner mitochondrial membrane once and the majority of the protein is found on the intermembrane side. CYC1 contains covalent heme bindings sites at positions 121 and 124 and heme axial ligand iron-metal binding sites at positions 125 and 244.[2][3]

Function

CYC1 encodes a protein that is located in the inner mitochondrial membrane and is part of Ubiquinol Cytochrome c Reductase (complex III). The encoded protein, CYC1, is a respiratory subunit of the cytochrome bc1 complex, which plays an important role in the mitochondrial respiratory chain by transferring electrons from the Rieske iron-sulfur protein to cytochrome c.[1][2][3]

Species

CYC1 is a human gene that is conserved in chimpanzee, Rhesus monkey, dog, cow, mouse, rat, zebrafish, fruit fly, mosquito, C. elegans, S. cerevisiae, K. lactis, E. gossypii, S. pombe, N. crassa, A. thaliana, rice, and frog.[6] There are orthologs of CYC1 in 137 known organisms.[7]

Clinical Significance

Variants of CYC1 have been associated with mitochondrial complex III deficiency, nuclear, type 6. Mitochondrial complex III deficiency, nuclear, type 6 is an autosomal recessive disorder of the mitochondrial respiratory chain resulting from a defect in Ubiquinol Cytochrome c Reductase (complex III) that leads to reduced complex III activity. Clinical features tend to emerge in early childhood and include episodic acute lactic acidosis, ketoacidosis, insulin-responsive hyperglycemia, liver dysfunction, encephalopathy, and associated infection, although psychomotor development may remain normal. Pathogenic mutations have included c.288G>T, p.Trp96Cys and c.643C>T p. Leu215Phe.[2][3][8]

Interactions

CYC1 has 78 protein-protein interactions with 72 of them being co-complex interactions.[9] CYC1 is one of 11 subunits of Ubiquinol Cytochrome c Reductase (b1-c complex) that includes the respiratory subunits cytochrome b, cytochrome c1 (CYC1), UQCRFS1, the core proteins UQCRC1 and UQCRC2, and the low-molecular weight proteins UQCRH, UQCRB, UQCRQ, UQCR10, UQCR11, as well as an additional cleavage product of UQCRFS1.[2][3] Additionally, CCP1, CDKA-1, and CDKB1-1 have also been found to interact with CYC1.[9]

References

  1. ↑ 1.0 1.1 1.2 "Entrez Gene: CYC1 cytochrome c-1". https://www.ncbi.nlm.nih.gov/gene?Db=gene&Cmd=ShowDetailView&TermToSearch=1537. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 "CYC1 - Cytochrome c1, heme protein, mitochondrial precursor - Homo sapiens (Human) - CYC1 gene & protein" (in en). https://www.uniprot.org/uniprot/P08574. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "UniProt: the universal protein knowledgebase". Nucleic Acids Research 45 (D1): D158–D169. January 2017. doi:10.1093/nar/gkw1099. PMID 27899622. 
  4. ↑ Yao, Daniel. "Cardiac Organellar Protein Atlas Knowledgebase (COPaKB) —— Protein Information". https://amino.heartproteome.org/web/protein/E0CYC1. 
  5. ↑ "Integration of cardiac proteome biology and medicine by a specialized knowledgebase". Circulation Research 113 (9): 1043–53. October 2013. doi:10.1161/CIRCRESAHA.113.301151. PMID 23965338. 
  6. ↑ "CYC1 cytochrome c1 [Homo sapiens (human)"]. U.S. National Library of Medicine. https://www.ncbi.nlm.nih.gov/gene/1537. 
  7. ↑ "ortholog_gene_1537[group"]. U.S. National Library of Medicine. https://www.ncbi.nlm.nih.gov/gene/?Term=ortholog_gene_1537%5Bgroup%5D. 
  8. ↑ "Mutations in CYC1, encoding cytochrome c1 subunit of respiratory chain complex III, cause insulin-responsive hyperglycemia". American Journal of Human Genetics 93 (2): 384–9. August 2013. doi:10.1016/j.ajhg.2013.06.015. PMID 23910460. 
  9. ↑ 9.0 9.1 "81 binary interactions found for search term CYC1". IntAct Molecular Interaction Database. EMBL-EBI. https://www.ebi.ac.uk/intact/interactions?conversationContext=3&query=CYC1. 

Further reading

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