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Pathway Description
Nucleotide Excision Repair
Homo sapiens
Metabolic Pathway
Created: 2013-08-22
Last Updated: 2019-08-13
In order to pass genetic information from one generation to the next, all organisms must accurately replicate their genomes during each cell division. This includes the nuclear genome and mitochondrial and chloroplast genomes. These are normally replicated with high fidelity that is achieved through the action of accurate DNA repair. Nucleotide Excision Repair is one os several mechanisms of DNA repair. Nucleotide excision repair (NER) operates on base damage caused by exogenous agents (such as mutagenic and carcinogenic chemicals and photoproducts generated by sunlight exposure) that cause alterations in the chemistry and structure of the DNA duplex . Such damage is recognized by a protein called XPC, which is stably bound to another protein called HHRAD23B (R23). The binding of the XPC–HHRAD23 heterodimeric subcomplex is followed by the binding of several other proteins (XPA, RPA, TFIIH and XPG). Of these, XPA and RPA are believed to facilitate specific recognition of base damage. TFIIH is a subcomplex of the RNA polymerase II transcription initiation machinery which also operates during NER. It consists of six subunits and contains two DNA helicase activities (XPB and XPD) that unwind the DNA duplex in the immediate vicinity of the base damage. This local denaturation generates a bubble in the DNA, the ends of which comprise junctions between duplex and single-stranded DNA. The subsequent binding of the ERCC1–XPF heterodimeric subcomplex generates a completely assembled NER multiprotein complex. XPG is a duplex/single-stranded DNA endonuclease that cuts the damaged strand at such junctions 3’ to the site of base damage. Conversely, the ERCC1–XPF heterodimeric protein is a duplex/single-stranded DNA endonuclease that cuts the damaged strand at such junctions 5’ to the site of base damage. This bimodal incision generates an oligonucleotide fragment 27–30 nucleotides in length which includes the damaged base. This fragment is excised from the genome, concomitant with restoring the potential 27–30 nucleotide gap by repair synthesis. Repair synthesis requires DNA polymerases or , as well as the accessory replication proteins PCNA, RPA and RFC. The covalent integrity of the damaged strand is then restored by DNA ligase. Collectively, these biochemical events return the damaged DNA to its native chemistry and configuration. ERCC1, excision repair cross-complementing 1; PCNA, proliferating cell nuclear antigen; POL, polymerase; RFC, replication factor C; RPA, replication protein A; TFIIH, transcription factor IIH; XP, xeroderma pigmentosum.
References
Nucleotide Excision Repair References
McCulloch SD, Kunkel TA: The fidelity of DNA synthesis by eukaryotic replicative and translesion synthesis polymerases. Cell Res. 2008 Jan;18(1):148-61. doi: 10.1038/cr.2008.4.
Pubmed: 18166979
Friedberg EC: How nucleotide excision repair protects against cancer. Nat Rev Cancer. 2001 Oct;1(1):22-33. doi: 10.1038/35094000.
Pubmed: 11900249
Weber CA, Salazar EP, Stewart SA, Thompson LH: ERCC2: cDNA cloning and molecular characterization of a human nucleotide excision repair gene with high homology to yeast RAD3. EMBO J. 1990 May;9(5):1437-47.
Pubmed: 2184031
Lamerdin JE, Stilwagen SA, Ramirez MH, Stubbs L, Carrano AV: Sequence analysis of the ERCC2 gene regions in human, mouse, and hamster reveals three linked genes. Genomics. 1996 Jun 15;34(3):399-409. doi: 10.1006/geno.1996.0303.
Pubmed: 8786141
Flejter WL, McDaniel LD, Johns D, Friedberg EC, Schultz RA: Correction of xeroderma pigmentosum complementation group D mutant cell phenotypes by chromosome and gene transfer: involvement of the human ERCC2 DNA repair gene. Proc Natl Acad Sci U S A. 1992 Jan 1;89(1):261-5. doi: 10.1073/pnas.89.1.261.
Pubmed: 1729695
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Pubmed: 14702039
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Pubmed: 15489334
Bechtel S, Rosenfelder H, Duda A, Schmidt CP, Ernst U, Wellenreuther R, Mehrle A, Schuster C, Bahr A, Blocker H, Heubner D, Hoerlein A, Michel G, Wedler H, Kohrer K, Ottenwalder B, Poustka A, Wiemann S, Schupp I: The full-ORF clone resource of the German cDNA Consortium. BMC Genomics. 2007 Oct 31;8:399. doi: 10.1186/1471-2164-8-399.
Pubmed: 17974005
Brookman KW, Lamerdin JE, Thelen MP, Hwang M, Reardon JT, Sancar A, Zhou ZQ, Walter CA, Parris CN, Thompson LH: ERCC4 (XPF) encodes a human nucleotide excision repair protein with eukaryotic recombination homologs. Mol Cell Biol. 1996 Nov;16(11):6553-62. doi: 10.1128/mcb.16.11.6553.
Pubmed: 8887684
Martin J, Han C, Gordon LA, Terry A, Prabhakar S, She X, Xie G, Hellsten U, Chan YM, Altherr M, Couronne O, Aerts A, Bajorek E, Black S, Blumer H, Branscomb E, Brown NC, Bruno WJ, Buckingham JM, Callen DF, Campbell CS, Campbell ML, Campbell EW, Caoile C, Challacombe JF, Chasteen LA, Chertkov O, Chi HC, Christensen M, Clark LM, Cohn JD, Denys M, Detter JC, Dickson M, Dimitrijevic-Bussod M, Escobar J, Fawcett JJ, Flowers D, Fotopulos D, Glavina T, Gomez M, Gonzales E, Goodstein D, Goodwin LA, Grady DL, Grigoriev I, Groza M, Hammon N, Hawkins T, Haydu L, Hildebrand CE, Huang W, Israni S, Jett J, Jewett PB, Kadner K, Kimball H, Kobayashi A, Krawczyk MC, Leyba T, Longmire JL, Lopez F, Lou Y, Lowry S, Ludeman T, Manohar CF, Mark GA, McMurray KL, Meincke LJ, Morgan J, Moyzis RK, Mundt MO, Munk AC, Nandkeshwar RD, Pitluck S, Pollard M, Predki P, Parson-Quintana B, Ramirez L, Rash S, Retterer J, Ricke DO, Robinson DL, Rodriguez A, Salamov A, Saunders EH, Scott D, Shough T, Stallings RL, Stalvey M, Sutherland RD, Tapia R, Tesmer JG, Thayer N, Thompson LS, Tice H, Torney DC, Tran-Gyamfi M, Tsai M, Ulanovsky LE, Ustaszewska A, Vo N, White PS, Williams AL, Wills PL, Wu JR, Wu K, Yang J, Dejong P, Bruce D, Doggett NA, Deaven L, Schmutz J, Grimwood J, Richardson P, Rokhsar DS, Eichler EE, Gilna P, Lucas SM, Myers RM, Rubin EM, Pennacchio LA: The sequence and analysis of duplication-rich human chromosome 16. Nature. 2004 Dec 23;432(7020):988-94. doi: 10.1038/nature03187.
Pubmed: 15616553
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