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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Inoue, Akira Fujii, Naoaki Hishiki, Asami Evison, Benjamin J. Kikuchi, Sotaro Shao, Youming Heath, Richard Actis, Marcelo Hashimoto, Hiroshi Canman, Christine E. |
| Description | Author Affiliation: Inoue A ( From the Department of Chemical Biology and Therapeutics.) |
| Abstract | Small molecule inhibitors of proliferating cell nuclear antigen (PCNA)/PCNA interacting protein box (PIP-Box) interactions, including T2 amino alcohol (T2AA), inhibit translesion DNA synthesis. The crystal structure of PCNA in complex with T2AA revealed that T2AA bound to the surface adjacent to the subunit interface of the homotrimer of PCNA in addition to the PIP-box binding cavity. Because this site is close to Lys-164, which is monoubiquitinated by RAD18, we postulated that T2AA would affect monoubiquitinated PCNA interactions. Binding of monoubiquitinated PCNA and a purified pol η fragment containing the UBZ and PIP-box was inhibited by T2AA in vitro. T2AA decreased PCNA/pol η and PCNA/REV1 chromatin colocalization but did not inhibit PCNA monoubiquitination, suggesting that T2AA hinders interactions of pol η and REV1 with monoubiquitinated PCNA. Interstrand DNA cross-links (ICLs) are repaired by mechanisms using translesion DNA synthesis that is regulated by monoubiquitinated PCNA. T2AA significantly delayed reactivation of a reporter plasmid containing an ICL. Neutral comet analysis of cells receiving T2AA in addition to cisplatin revealed that T2AA significantly enhanced formation of DNA double strand breaks (DSBs) by cisplatin. T2AA promoted colocalized foci formation of phospho-ATM and 53BP1 and up-regulated phospho-BRCA1 in cisplatin-treated cells, suggesting that T2AA increases DSBs. When cells were treated by cisplatin and T2AA, their clonogenic survival was significantly less than that of those treated by cisplatin only. These findings show that the inhibitors of monoubiquitinated PCNA chemosensitize cells by inhibiting repair of ICLs and DSBs. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 10 |
| Volume Number | 289 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2014-03-07 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antineoplastic Agents Pharmacology Cisplatin DNA Breaks, Double-Stranded Drug Effects DNA Repair Drug Resistance, Neoplasm Neoplasms Metabolism Phenyl Ethers Proliferating Cell Nuclear Antigen Propanolamines Small Molecule Libraries Animals COS Cells Cercopithecus Aethiops Crystallography, X-Ray HeLa Cells Genetics Chemistry Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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