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DNA polymerase ? uses its lyase domain in a processive search for DNA damage.


ABSTRACT: DNA polymerase (Pol) ? maintains genome fidelity by catalyzing DNA synthesis and removal of a reactive DNA repair intermediate during base excision repair (BER). Situated within the middle of the BER pathway, Pol ? must efficiently locate its substrates before damage is exacerbated. The mechanisms of damage search and location by Pol ? are largely unknown, but are critical for understanding the fundamental features of the BER pathway. We developed a processive search assay to determine if Pol ? has evolved a mechanism for efficient DNA damage location. These assays revealed that Pol ? scans DNA using a processive hopping mechanism and has a mean search footprint of ?24 bp at predicted physiological ionic strength. Lysines within the lyase domain are required for processive searching, revealing a novel function for the lyase domain of Pol ?. Application of our processive search assay into nucleosome core particles revealed that Pol ? is not processive in the context of a nucleosome, and its single-turnover activity is reduced ?500-fold, as compared to free DNA. These data suggest that the repair footprint of Pol ? mainly resides within accessible regions of the genome and that these regions can be scanned for damage by Pol ?.

SUBMITTER: Howard MJ 

PROVIDER: S-EPMC5397181 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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DNA polymerase β uses its lyase domain in a processive search for DNA damage.

Howard Michael J MJ   Rodriguez Yesenia Y   Wilson Samuel H SH  

Nucleic acids research 20170401 7


DNA polymerase (Pol) β maintains genome fidelity by catalyzing DNA synthesis and removal of a reactive DNA repair intermediate during base excision repair (BER). Situated within the middle of the BER pathway, Pol β must efficiently locate its substrates before damage is exacerbated. The mechanisms of damage search and location by Pol β are largely unknown, but are critical for understanding the fundamental features of the BER pathway. We developed a processive search assay to determine if Pol β  ...[more]

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