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The vaccinia virus DNA polymerase structure provides insights into the mode of processivity factor binding

N. Tarbouriech, C. Ducournau, S. Hutin, PJ. Mas, P. Man, E. Forest, DJ. Hart, CN. Peyrefitte, WP. Burmeister, F. Iseni,

. 2017 ; 8 (1) : 1455. [pub] 20171113

Language English Country England, Great Britain

Document type Journal Article, Research Support, Non-U.S. Gov't

Persistent link   https://www.medvik.cz/link/bmc18033570

Vaccinia virus (VACV), the prototype member of the Poxviridae, replicates in the cytoplasm of an infected cell. The catalytic subunit of the DNA polymerase E9 binds the heterodimeric processivity factor A20/D4 to form the functional polymerase holoenzyme. Here we present the crystal structure of full-length E9 at 2.7 Å resolution that permits identification of important poxvirus-specific structural insertions. One insertion in the palm domain interacts with C-terminal residues of A20 and thus serves as the processivity factor-binding site. This is in strong contrast to all other family B polymerases that bind their co-factors at the C terminus of the thumb domain. The VACV E9 structure also permits rationalization of polymerase inhibitor resistance mutations when compared with the closely related eukaryotic polymerase delta-DNA complex.

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$a Vaccinia virus (VACV), the prototype member of the Poxviridae, replicates in the cytoplasm of an infected cell. The catalytic subunit of the DNA polymerase E9 binds the heterodimeric processivity factor A20/D4 to form the functional polymerase holoenzyme. Here we present the crystal structure of full-length E9 at 2.7 Å resolution that permits identification of important poxvirus-specific structural insertions. One insertion in the palm domain interacts with C-terminal residues of A20 and thus serves as the processivity factor-binding site. This is in strong contrast to all other family B polymerases that bind their co-factors at the C terminus of the thumb domain. The VACV E9 structure also permits rationalization of polymerase inhibitor resistance mutations when compared with the closely related eukaryotic polymerase delta-DNA complex.
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$a Ducournau, Corinne $u Unité de Virologie, Institut de Recherche Biomédicale des Armées, BP 73, 91223, Brétigny-sur-Orge Cedex, France.
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$a Hutin, Stephanie $u Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CNRS, CEA, 71 Avenue des Martyrs, 38042, Grenoble, France.
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$a Mas, Philippe J $u Integrated Structural Biology Grenoble (ISBG) CNRS, CEA, Université Grenoble Alpes, EMBL, 71 Avenue des Martyrs, 38042, Grenoble, France.
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$a Man, Petr $u BioCeV-Institute of Microbiology, Czech Academy of Sciences, Prumyslova 595, 252 50, Vestec, Czech Republic. Faculty of Science, Charles University, Hlavova 8, 128 43, Prague 2, Czech Republic.
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$a Forest, Eric $u Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CNRS, CEA, 71 Avenue des Martyrs, 38042, Grenoble, France.
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$a Hart, Darren J $u Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CNRS, CEA, 71 Avenue des Martyrs, 38042, Grenoble, France.
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$a Peyrefitte, Christophe N $u Unité de Virologie, Institut de Recherche Biomédicale des Armées, BP 73, 91223, Brétigny-sur-Orge Cedex, France. Emerging Pathogens Laboratory, Fondation Mérieux, 21 Avenue Tony Garnier, 69007, Lyon, France.
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$a Burmeister, Wim P $u Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CNRS, CEA, 71 Avenue des Martyrs, 38042, Grenoble, France.
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$a Iseni, Frédéric $u Unité de Virologie, Institut de Recherche Biomédicale des Armées, BP 73, 91223, Brétigny-sur-Orge Cedex, France. fredericiseni@gmail.com.
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