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Poly (ADP-ribose) polymerase 1
Protein PARP1 PDB 1uk0.png
PDB rendering based on 1uk0.
Available structures
PDB Ortholog search: PDBe, RCSB
External IDs OMIM173870 MGI1340806 HomoloGene1222 ChEMBL: 3105 GeneCards: PARP1 Gene
EC number
RNA expression pattern
PBB GE PARP1 208644 at tn.png
More reference expression data
Species Human Mouse
Entrez 142 11545
Ensembl ENSG00000143799 ENSMUSG00000026496
UniProt P09874 P11103
RefSeq (mRNA) NM_001618 NM_007415
RefSeq (protein) NP_001609 NP_031441
Location (UCSC) Chr 1:
226.55 – 226.6 Mb
Chr 1:
180.57 – 180.6 Mb
PubMed search [1] [2]

Poly [ADP-ribose] polymerase 1 (PARP-1) also known as NAD+ ADP-ribosyltransferase 1 or poly[ADP-ribose] synthase 1 is an enzyme that in humans is encoded by the PARP1 gene.[1]


PARP1 works:

  • By modifying nuclear proteins by poly ADP-ribosylation.
  • In conjunction with BRCA, which acts on double strands; members of the PARP family act on single strands; or, when BRCA fails, PARP takes over those jobs as well.

PARP1 is involved in:

PARP1 is activated by:

Role in DNA damage repair[edit]

PARP1 has a role in repair of single-stranded DNA (ssDNA) breaks. Knocking down intracellular PARP1 levels with siRNA or inhibiting PARP1 activity with small molecules reduces repair of ssDNA breaks. In the absence of PARP1, when these breaks are encountered during DNA replication, the replication fork stalls, and double-strand DNA (dsDNA) breaks accumulate. These dsDNA breaks are repaired via homologous recombination (HR) repair, a potentially error-free repair mechanism. For this reason, cells lacking PARP1 show a hyper-recombinagenic phenotype (e.g., an increased frequency of HR),[4][5][6] which has also been observed in vivo in mice using the pun assay.[7] Thus, if the HR pathway is functioning, PARP1 null mutants (cells without functioning PARP1) do not show an unhealthy phenotype, and in fact, PARP1 knockout mice show no negative phenotype and no increased incidence of tumor formation.[8]

Interaction with BRCA1 and BRCA2[edit]

However, both BRCA1 and BRCA2 are at least partially necessary for the HR pathway to function. Therefore, cells that are deficient in BRCA1 or BRCA2 have been shown to be highly sensitive to PARP1 inhibition or knock-down, resulting in cell death by apoptosis, in stark contrast to cells with at least one good copy of both BRCA1 and BRCA2. Many breast cancers have defects in the BRCA1/BRCA2 HR repair pathway due to mutations in either BRCA1 or BRCA2, or other essential genes in the pathway (the latter termed cancers with "BRCAness"). Tumors with BRCAness are hypothesized to be highly sensitive to PARP1 inhibitors, and it has been demonstrated in mice that these inhibitors can both prevent BRCA1/2-deficient xenografts from becoming tumors and eradicate tumors having previously formed from BRCA1/2-deficient xenografts.

Application to cancer therapy[edit]

It is hypothesized that PARP1 inhibitors may prove highly effective therapies for cancers with BRCAness, due to the high sensitivity of the tumors to the inhibitor and the lack of deleterious effects on the remaining healthy cells with functioning BRCA HR pathway. This is in contrast to conventional chemotherapies, which are highly toxic to all cells and can induce DNA damage in healthy cells, leading to secondary cancer generation.[9][10]


PARP activity (which is mainly due to PARP1) measured in the permeabilized mononuclear leukocyte blood cells of thirteen mammalian species (rat, guinea pig, rabbit, marmoset, sheep, pig, cattle, pigmy chimpanzee, horse, donkey, gorilla elephant and man) correlates with maximum lifespan of the species.[11] Lymphoblastoid cell lines established from blood samples of humans who were centenarians (100 years old or older) have significantly higher PARP activity than cell lines from younger (20 to 70 years old) individuals.[12] The Wrn protein is deficient in persons with Werner syndrome, a human premature aging disorder. PARP1 and Wrn proteins are part of a complex involved in the processing of DNA breaks.[13] These findings indicate a linkage between longevity and PARP-mediated DNA repair capability. Furthermore these observations suggest that PARP repair activity contributes to mammalian longevity, consistent with the DNA damage theory of aging.[14]

PARP1 appears to be resveratrol's primary functional target through its interaction with the tyrosyl tRNA synthetase (TyrRS).[15]


PARP1 has been shown to interact with:

See also[edit]


  1. ^ Ha HC, Snyder SH (Aug 2000). "Poly(ADP-ribose) polymerase-1 in the nervous system". Neurobiology of Disease 7 (4): 225–39. doi:10.1006/nbdi.2000.0324. PMID 10964595. 
  2. ^ "Entrez Gene: PARP1 poly (ADP-ribose) polymerase family, member 1". 
  3. ^ Nossa CW, Jain P, Tamilselvam B, Gupta VR, Chen LF, Schreiber V et al. (Nov 2009). "Activation of the abundant nuclear factor poly(ADP-ribose) polymerase-1 by Helicobacter pylori". Proceedings of the National Academy of Sciences of the United States of America 106 (47): 19998–20003. doi:10.1073/pnas.0906753106. PMC 2785281. PMID 19897724. Lay 
  4. ^ Godon C, Cordelières FP, Biard D, Giocanti N, Mégnin-Chanet F, Hall J et al. (Aug 2008). "PARP inhibition versus PARP-1 silencing: different outcomes in terms of single-strand break repair and radiation susceptibility". Nucleic Acids Research 36 (13): 4454–64. doi:10.1093/nar/gkn403. PMC 2490739. PMID 18603595.  Vancouver style error (help)
  5. ^ Schultz N, Lopez E, Saleh-Gohari N, Helleday T (Sep 2003). "Poly(ADP-ribose) polymerase (PARP-1) has a controlling role in homologous recombination". Nucleic Acids Research 31 (17): 4959–64. doi:10.1093/nar/gkg703. PMC 212803. PMID 12930944. 
  6. ^ Waldman AS, Waldman BC (Nov 1991). "Stimulation of intrachromosomal homologous recombination in mammalian cells by an inhibitor of poly(ADP-ribosylation)". Nucleic Acids Research 19 (21): 5943–7. doi:10.1093/nar/19.21.5943. PMC 329051. PMID 1945881. 
  7. ^ Claybon A, Karia B, Bruce C, Bishop AJ (Nov 2010). "PARP1 suppresses homologous recombination events in mice in vivo". Nucleic Acids Research 38 (21): 7538–45. doi:10.1093/nar/gkq624. PMC 2995050. PMID 20660013. 
  8. ^ Wang ZQ, Auer B, Stingl L, Berghammer H, Haidacher D, Schweiger M et al. (Mar 1995). "Mice lacking ADPRT and poly(ADP-ribosyl)ation develop normally but are susceptible to skin disease". Genes & Development 9 (5): 509–20. doi:10.1101/gad.9.5.509. PMID 7698643. 
  9. ^ Bryant HE, Schultz N, Thomas HD, Parker KM, Flower D, Lopez E et al. (Apr 2005). "Specific killing of BRCA2-deficient tumours with inhibitors of poly(ADP-ribose) polymerase". Nature 434 (7035): 913–7. Bibcode:2005Natur.434..913B. doi:10.1038/nature03443. PMID 15829966. 
  10. ^ Farmer H, McCabe N, Lord CJ, Tutt AN, Johnson DA, Richardson TB et al. (Apr 2005). "Targeting the DNA repair defect in BRCA mutant cells as a therapeutic strategy". Nature 434 (7035): 917–21. Bibcode:2005Natur.434..917F. doi:10.1038/nature03445. PMID 15829967. 
  11. ^ Grube K, Bürkle A (Dec 1992). "Poly(ADP-ribose) polymerase activity in mononuclear leukocytes of 13 mammalian species correlates with species-specific life span". Proceedings of the National Academy of Sciences of the United States of America 89 (24): 11759–63. Bibcode:1992PNAS...8911759G. doi:10.1073/pnas.89.24.11759. PMC 50636. PMID 1465394.  Vancouver style error (help)
  12. ^ Muiras ML, Müller M, Schächter F, Bürkle A (Apr 1998). "Increased poly(ADP-ribose) polymerase activity in lymphoblastoid cell lines from centenarians". Journal of Molecular Medicine 76 (5): 346–54. doi:10.1007/s001090050226. PMID 9587069.  Vancouver style error (help)
  13. ^ Lebel M, Lavoie J, Gaudreault I, Bronsard M, Drouin R (May 2003). "Genetic cooperation between the Werner syndrome protein and poly(ADP-ribose) polymerase-1 in preventing chromatid breaks, complex chromosomal rearrangements, and cancer in mice". The American Journal of Pathology 162 (5): 1559–69. doi:10.1016/S0002-9440(10)64290-3. PMC 1851180. PMID 12707040. 
  14. ^ Bernstein H, Payne CM, Bernstein C, Garewal H, Dvorak K (2008). Kimura H, Suzuki A, ed. Cancer and aging as consequences of un-repaired DNA damage. New York: Nova Science Publishers, Inc. pp. 1–47. ISBN 978-1604565812. 
  15. ^ Sajish M, Schimmel P (Dec 2014). "A human tRNA synthetase is a potent PARP1-activating effector target for resveratrol". Nature. doi:10.1038/nature14028. PMID 25533949. 
  16. ^ a b c Gueven N, Becherel OJ, Kijas AW, Chen P, Howe O, Rudolph JH et al. (May 2004). "Aprataxin, a novel protein that protects against genotoxic stress". Human Molecular Genetics 13 (10): 1081–93. doi:10.1093/hmg/ddh122. PMID 15044383. 
  17. ^ Morgan HE, Jefferson LS, Wolpert EB, Rannels DE (Apr 1971). "Regulation of protein synthesis in heart muscle. II. Effect of amino acid levels and insulin on ribosomal aggregation". The Journal of Biological Chemistry 246 (7): 2163–70. PMID 5555565. 
  18. ^ Cervellera MN, Sala A (Apr 2000). "Poly(ADP-ribose) polymerase is a B-MYB coactivator". The Journal of Biological Chemistry 275 (14): 10692–6. doi:10.1074/jbc.275.14.10692. PMID 10744766. 
  19. ^ Hassa PO, Covic M, Hasan S, Imhof R, Hottiger MO (Dec 2001). "The enzymatic and DNA binding activity of PARP-1 are not required for NF-kappa B coactivator function". The Journal of Biological Chemistry 276 (49): 45588–97. doi:10.1074/jbc.M106528200. PMID 11590148. 
  20. ^ Malanga M, Pleschke JM, Kleczkowska HE, Althaus FR (May 1998). "Poly(ADP-ribose) binds to specific domains of p53 and alters its DNA binding functions". The Journal of Biological Chemistry 273 (19): 11839–43. doi:10.1074/jbc.273.19.11839. PMID 9565608. 
  21. ^ a b Dantzer F, Nasheuer HP, Vonesch JL, de Murcia G, Ménissier-de Murcia J (Apr 1998). "Functional association of poly(ADP-ribose) polymerase with DNA polymerase alpha-primase complex: a link between DNA strand break detection and DNA replication". Nucleic Acids Research 26 (8): 1891–8. doi:10.1093/nar/26.8.1891. PMC 147507. PMID 9518481.  Vancouver style error (help)
  22. ^ Masson M, Niedergang C, Schreiber V, Muller S, Menissier-de Murcia J, de Murcia G (Jun 1998). "XRCC1 is specifically associated with poly(ADP-ribose) polymerase and negatively regulates its activity following DNA damage". Molecular and Cellular Biology 18 (6): 3563–71. PMC 108937. PMID 9584196. 
  23. ^ Ku MC, Stewart S, Hata A (Nov 2003). "Poly(ADP-ribose) polymerase 1 interacts with OAZ and regulates BMP-target genes". Biochemical and Biophysical Research Communications 311 (3): 702–7. doi:10.1016/j.bbrc.2003.10.053. PMID 14623329.