PMID- 30670696 OWN - NLM STAT- In-Process LR - 20190129 IS - 2041-1723 (Electronic) IS - 2041-1723 (Linking) VI - 10 IP - 1 DP - 2019 Jan 22 TI - Structural consequence of the most frequently recurring cancer-associated substitution in DNA polymerase epsilon. PG - 373 LID - 10.1038/s41467-018-08114-9 [doi] AB - 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. FAU - Parkash, Vimal AU - Parkash V AUID- ORCID: 0000-0003-4365-6213 AD - Department of Medical Biochemistry and Biophysics, Umea University, Umea, SE-90187, Sweden. FAU - Kulkarni, Yashraj AU - Kulkarni Y AUID- ORCID: 0000-0002-7643-9867 AD - Department of Chemistry - BMC, Uppsala University, Box 576, Uppsala, S-751 23, Sweden. FAU - Ter Beek, Josy AU - Ter Beek J AUID- ORCID: 0000-0003-4165-9277 AD - Department of Medical Biochemistry and Biophysics, Umea University, Umea, SE-90187, Sweden. FAU - Shcherbakova, Polina V AU - Shcherbakova PV AD - Eppley Institute for Research in Cancer and Allied Diseases, Fred & Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, 68198, USA. FAU - Kamerlin, Shina Caroline Lynn AU - Kamerlin SCL AUID- ORCID: 0000-0002-3190-1173 AD - Department of Chemistry - BMC, Uppsala University, Box 576, Uppsala, S-751 23, Sweden. lynn.kamerlin@kemi.uu.se. FAU - Johansson, Erik AU - Johansson E AUID- ORCID: 0000-0002-8526-6224 AD - Department of Medical Biochemistry and Biophysics, Umea University, Umea, SE-90187, Sweden. erik.tm.johansson@umu.se. LA - eng GR - R01 ES015869/ES/NIEHS NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, N.I.H., Extramural DEP - 20190122 PL - England TA - Nat Commun JT - Nature communications JID - 101528555 PMC - PMC6342957 EDAT- 2019/01/24 06:00 MHDA- 2019/01/24 06:00 CRDT- 2019/01/24 06:00 PHST- 2018/04/19 00:00 [received] PHST- 2018/12/12 00:00 [accepted] PHST- 2019/01/24 06:00 [entrez] PHST- 2019/01/24 06:00 [pubmed] PHST- 2019/01/24 06:00 [medline] AID - 10.1038/s41467-018-08114-9 [doi] AID - 10.1038/s41467-018-08114-9 [pii] PST - epublish SO - Nat Commun. 2019 Jan 22;10(1):373. doi: 10.1038/s41467-018-08114-9.