DNA polymerase beta
Ensembl | |||||||||
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| Location (UCSC) | n/a | Chr 8: 23.12 – 23.14 Mb | |||||||
| PubMed search | [2] | [3] | |||||||
| View/Edit Human | View/Edit Mouse |
| Stem loopII regulatory element in POLB | |
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Chr. 8 p11.2 | |
| PDB structures | PDBe |
DNA polymerase beta, also known as POLB, is an
Function
In eukaryotic cells, DNA polymerase beta (POLB) performs base excision repair (BER) required for DNA maintenance, replication, recombination, and drug resistance.[4]
The mitochondrial DNA of mammalian cells is constantly under attack from oxygen radicals released during ATP production. Mammalian cell mitochondria contain an efficient base excision repair system employing POLB that removes some frequent oxidative DNA damages.[5] POLB thus has a key role in maintaining the stability of the mitochondrial genome.[5]
An analysis of the fidelity of DNA replication by polymerase beta in the neurons from young and very aged mice indicated that aging has no significant effect on the fidelity of DNA synthesis by polymerase beta.[6] This finding was considered to provide evidence against the error catastrophe theory of aging.[6][7]
Base excision repair
Cabelof et al. measured the ability to repair DNA damage by the BER pathway in tissues of young (4-month-old) and old (24-month-old) mice.[8] In all tissues examined (brain, liver, spleen and testes) the ability to repair DNA damage declined significantly with age, and the reduction in repair capability correlated with decreased levels of DNA polymerase beta at both the protein and messenger RNA levels. Numerous investigators have reported an accumulation of DNA damage with age, especially in brain and liver.[9] Cabelof et al.[8] suggested that the inability of the BER pathway to repair damages over time may provide a mechanistic explanation for the frequent observations of DNA accumulation of damage with age.
Regulation of expression
DNA polymerase beta maintains genome integrity by participating in
alkylating agents, induced apoptosis, and chromosomal breaking. Therefore, it is essential that POLB expression is tightly regulated.[10][11][12][13]
POLB gene is upregulated by
pre-mRNA processing
. M2 has been shown to be evolutionary conserved, and, through mutagenesis, it was shown that this stem loop structure acts as a RNA destabilizing element.
In addition to these cis-regulatory elements present within the 3'UTR a trans-acting protein, HAX1 is thought to contribute to the regulation of gene expression. Yeast three-hybrid assays have shown that this protein binds to the stem loops within the 3'UTR of the POLB mRNA, however the exact mechanism in how this protein regulates gene expression is still to be determined.
Interactions
DNA polymerase beta has been shown to
See also
- POLA1
- POLA2
References
- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000031536 – Ensembl, May 2017
- ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ a b "NCBI Gene: DNA polymerase beta".
- ^ PMID 29100041.
- ^ S2CID 84448241.
- S2CID 4153800.
- ^ PMID 11890943.
- ISBN 0-12-092860-4.
- PMID 9770529.
- PMID 12067997.
- S2CID 30039904.
- PMID 10357787.
- S2CID 33798724.
- PMID 8702497.
- PMID 17704138.
- S2CID 1487128.
- S2CID 35569215.
- PMID 15107487.
- PMID 8978692.
- PMID 11467963.
Further reading
- Date T, Tanihara K, Yamamoto S, Nomura N, Matsukage A (September 1992). "Two regions in human DNA polymerase beta mRNA suppress translation in Escherichia coli". Nucleic Acids Research. 20 (18): 4859–64. PMID 1408801.
- Wang L, Patel U, Ghosh L, Banerjee S (September 1992). "DNA polymerase beta mutations in human colorectal cancer". Cancer Research. 52 (17): 4824–7. PMID 1511447.
- Tokui T, Inagaki M, Nishizawa K, Yatani R, Kusagawa M, Ajiro K, et al. (June 1991). "Inactivation of DNA polymerase beta by in vitro phosphorylation with protein kinase C". The Journal of Biological Chemistry. 266 (17): 10820–4. PMID 2040602.
- SenGupta DN, Zmudzka BZ, Kumar P, Cobianchi F, Skowronski J, Wilson SH (April 1986). "Sequence of human DNA polymerase beta mRNA obtained through cDNA cloning". Biochemical and Biophysical Research Communications. 136 (1): 341–7. PMID 2423078.
- Zmudzka BZ, Fornace A, Collins J, Wilson SH (October 1988). "Characterization of DNA polymerase beta mRNA: cell-cycle and growth response in cultured human cells". Nucleic Acids Research. 16 (20): 9587–96. PMID 2460824.
- Widen SG, Kedar P, Wilson SH (November 1988). "Human beta-polymerase gene. Structure of the 5'-flanking region and active promoter". The Journal of Biological Chemistry. 263 (32): 16992–8. PMID 3182828.
- Abbotts J, SenGupta DN, Zmudzka B, Widen SG, Notario V, Wilson SH (February 1988). "Expression of human DNA polymerase beta in Escherichia coli and characterization of the recombinant enzyme". Biochemistry. 27 (3): 901–9. PMID 3284575.
- Dobashi Y, Kubota Y, Shuin T, Torigoe S, Yao M, Hosaka M (April 1995). "Polymorphisms in the human DNA polymerase beta gene". Human Genetics. 95 (4): 389–90. S2CID 22658070.
- Chyan YJ, Ackerman S, Shepherd NS, McBride OW, Widen SG, Wilson SH, Wood TG (July 1994). "The human DNA polymerase beta gene structure. Evidence of alternative splicing in gene expression". Nucleic Acids Research. 22 (14): 2719–25. PMID 7914364.
- Maruyama K, Sugano S (January 1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. PMID 8125298.
- Chang M, Burmer GC, Sweasy J, Loeb LA, Edelhoff S, Disteche CM, et al. (May 1994). "Evidence against DNA polymerase beta as a candidate gene for Werner syndrome". Human Genetics. 93 (5): 507–12. S2CID 34824853.
- Chyan YJ, Strauss PR, Wood TG, Wilson SH (August 1996). "Identification of novel mRNA isoforms for human DNA polymerase beta". DNA and Cell Biology. 15 (8): 653–9. PMID 8769567.
- Pelletier H, Sawaya MR, Wolfle W, Wilson SH, Kraut J (October 1996). "Crystal structures of human DNA polymerase beta complexed with DNA: implications for catalytic mechanism, processivity, and fidelity". Biochemistry. 35 (39): 12742–61. PMID 8841118.
- Pelletier H, Sawaya MR, Wolfle W, Wilson SH, Kraut J (October 1996). "A structural basis for metal ion mutagenicity and nucleotide selectivity in human DNA polymerase beta". Biochemistry. 35 (39): 12762–77. PMID 8841119.
- Pelletier H, Sawaya MR (October 1996). "Characterization of the metal ion binding helix-hairpin-helix motifs in human DNA polymerase beta by X-ray structural analysis". Biochemistry. 35 (39): 12778–87. PMID 8841120.
- Kubota Y, Nash RA, Klungland A, Schär P, Barnes DE, Lindahl T (December 1996). "Reconstitution of DNA base excision-repair with purified human proteins: interaction between DNA polymerase beta and the XRCC1 protein". The EMBO Journal. 15 (23): 6662–70. PMID 8978692.
- Bennett RA, Wilson DM, Wong D, Demple B (July 1997). "Interaction of human apurinic endonuclease and DNA polymerase beta in the base excision repair pathway". Proceedings of the National Academy of Sciences of the United States of America. 94 (14): 7166–9. PMID 9207062.
- Sawaya MR, Prasad R, Wilson SH, Kraut J, Pelletier H (September 1997). "Crystal structures of human DNA polymerase beta complexed with gapped and nicked DNA: evidence for an induced fit mechanism". Biochemistry. 36 (37): 11205–15. PMID 9287163.
- Bhattacharyya N, Banerjee S (September 1997). "A variant of DNA polymerase beta acts as a dominant negative mutant". Proceedings of the National Academy of Sciences of the United States of America. 94 (19): 10324–9. PMID 9294209.
- Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (October 1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. PMID 9373149.
- Tan XH, Zhao M, Pan KF, Dong Y, Dong B, Feng GJ, et al. (March 2005). "Frequent mutation related with overexpression of DNA polymerase beta in primary tumors and precancerous lesions of human stomach". Cancer Letters. 220 (1): 101–14. PMID 15737693.
External links
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![2i9g: DNA Polymerase Beta with a Benzo[c]phenanthrene diol epoxide adducted guanine base](/File:PDB_2i9g_EBI.jpg)
