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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Minko, Irina G. Lloyd, R. Stephen Kumari, Anuradha Goodman, Myron F. Finkel, Steven E. Harbut, Michael B. |
| Description | Author Affiliation: Kumari A ( Center for Research on Occupational and Environmental Toxicology and the Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, Oregon 97239-3098, USA.) |
| Abstract | Repair of interstrand DNA cross-links (ICLs) in Escherichia coli can occur through a combination of nucleotide excision repair (NER) and homologous recombination. However, an alternative mechanism has been proposed in which repair is initiated by NER followed by translesion DNA synthesis (TLS) and completed through another round of NER. Using site-specifically modified oligodeoxynucleotides that serve as a model for potential repair intermediates following incision by E. coli NER proteins, the ability of E. coli DNA polymerases (pol) II and IV to catalyze TLS past N(2)-N(2)-guanine ICLs was determined. No biochemical evidence was found suggesting that pol II could bypass these lesions. In contrast, pol IV could catalyze TLS when the nucleotides that are 5' to the cross-link were removed. The efficiency of TLS was further increased when the nucleotides 3' to the cross-linked site were also removed. The correct nucleotide, C, was preferentially incorporated opposite the lesion. When E. coli cells were transformed with a vector carrying a site-specific N(2)-N(2)-guanine ICL, the transformation efficiency of a pol II-deficient strain was indistinguishable from that of the wild type. However, the ability to replicate the modified vector DNA was nearly abolished in a pol IV-deficient strain. These data strongly suggest that pol IV is responsible for TLS past N(2)-N(2)-guanine ICLs. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 41 |
| Volume Number | 283 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2008-10-10 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | DNA Repair Physiology DNA Replication DNA, Bacterial Biosynthesis DNA-Directed DNA Polymerase Metabolism Escherichia Coli Proteins Escherichia Coli Enzymology Recombination, Genetic Catalysis DNA Polymerase II Genetics DNA Polymerase Beta Research Support, N.I.H., Extramural Research Support, U.S. Gov't, Non-P.H.S. Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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