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-Structure paper
タイトル | Cryo-EM structure of human Pol κ bound to DNA and mono-ubiquitylated PCNA. |
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ジャーナル・号・ページ | Nat Commun, Vol. 12, Issue 1, Page 6095, Year 2021 |
掲載日 | 2021年10月19日 |
著者 | Claudia Lancey / Muhammad Tehseen / Souvika Bakshi / Matthew Percival / Masateru Takahashi / Mohamed A Sobhy / Vlad S Raducanu / Kerry Blair / Frederick W Muskett / Timothy J Ragan / Ramon Crehuet / Samir M Hamdan / Alfredo De Biasio / |
PubMed 要旨 | Y-family DNA polymerase κ (Pol κ) can replicate damaged DNA templates to rescue stalled replication forks. Access of Pol κ to DNA damage sites is facilitated by its interaction with the ...Y-family DNA polymerase κ (Pol κ) can replicate damaged DNA templates to rescue stalled replication forks. Access of Pol κ to DNA damage sites is facilitated by its interaction with the processivity clamp PCNA and is regulated by PCNA mono-ubiquitylation. Here, we present cryo-EM reconstructions of human Pol κ bound to DNA, an incoming nucleotide, and wild type or mono-ubiquitylated PCNA (Ub-PCNA). In both reconstructions, the internal PIP-box adjacent to the Pol κ Polymerase-Associated Domain (PAD) docks the catalytic core to one PCNA protomer in an angled orientation, bending the DNA exiting the Pol κ active site through PCNA, while Pol κ C-terminal domain containing two Ubiquitin Binding Zinc Fingers (UBZs) is invisible, in agreement with disorder predictions. The ubiquitin moieties are partly flexible and extend radially away from PCNA, with the ubiquitin at the Pol κ-bound protomer appearing more rigid. Activity assays suggest that, when the internal PIP-box interaction is lost, Pol κ is retained on DNA by a secondary interaction between the UBZs and the ubiquitins flexibly conjugated to PCNA. Our data provide a structural basis for the recruitment of a Y-family TLS polymerase to sites of DNA damage. |
リンク | Nat Commun / PubMed:34667155 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.4 - 6.4 Å |
構造データ | EMDB-12601, PDB-7nv0: EMDB-12602, PDB-7nv1: |
化合物 | ChemComp-TTP: |
由来 |
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キーワード | REPLICATION / Translesion synthesis / TLS |