Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 105, Issue 14, Pages 5361-5366Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0801310105
Keywords
translesion DNA synthesis; ubiquitin binding domain; holoenzyme stability
Categories
Funding
- NCI NIH HHS [CA107650, R01 CA107650] Funding Source: Medline
- NIGMS NIH HHS [GM13306, R01 GM013306] Funding Source: Medline
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To ensure efficient and timely replication of genomic DNA, organisms in all three kingdoms of life possess specialized translesion DNA synthesis (TLS) polymerases (Pots) that tolerate various types of DNA lesions. It has been proposed that an exchange between the replicative DNA Pol and the TLS Pol at the site of DNA damage enables lesion bypass to occur. However, to date the molecular mechanism underlying this process is not fully understood. In this study, we demonstrated in a reconstituted system that the exchange of Saccharomyces cerevisiae Pol delta with Pol eta requires both the stalling of the holoenzyme and the monoubiquitination of proliferating cell nuclear antigen (PCNA). A moving Pol delta holoenzyme is refractory to the incoming Pol eta. Furthermore, we showed that the Pol eta C-terminal PCNA-interacting protein motif is required for the exchange process. We also demonstrated that the second exchange step to bring back Pol delta is prohibited when Lys-164 of PCNA is monoubiquitinated. Thus the removal of the ubiquitin moiety from PCNA is likely required for the reverse exchange step after the lesion bypass synthesis by Pol eta.
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