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Structural consequence of the most frequently recurring cancer-associated substitution in DNA polymerase epsilon
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 373Article in journal (Refereed) Published
Abstract [en]

The most frequently recurring cancer-associated DNA polymerase epsilon (Pol epsilon) mutation is a P286R substitution in the exonuclease domain. While originally proposed to increase genome instability by disrupting exonucleolytic proofreading, the P286R variant was later found to be significantly more pathogenic than Pol epsilon proofreading deficiency per se. The mechanisms underlying its stronger impact remained unclear. Here we report the crystal structure of the yeast orthologue, Pol epsilon-P301R, complexed with DNA and an incoming dNTP. Structural changes in the protein are confined to the exonuclease domain, with R301 pointing towards the exonuclease site. Molecular dynamics simulations suggest that R301 interferes with DNA binding to the exonuclease site, an outcome not observed with the exonuclease-inactive Pol epsilon-D290A, E292A variant lacking the catalytic residues. These results reveal a distinct mechanism of exonuclease inactivation by the P301R substitution and a likely basis for its dramatically higher mutagenic and tumorigenic effects.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019. Vol. 10, article id 373
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Cell and Molecular Biology
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URN: urn:nbn:se:umu:diva-156315DOI: 10.1038/s41467-018-08114-9ISI: 000456286400001PubMedID: 30670696OAI: oai:DiVA.org:umu-156315DiVA, id: diva2:1290632
Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-02-21Bibliographically approved

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Parkash, Vimalter Beek, JosyJohansson, Erik

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