Structure of an archaeal PCNA1-PCNA2-FEN1 complex: elucidating PCNA subunit and client enzyme specificity

Roe, Mark, Bell, Stephen, Doré, Andrew, Sarah, Jones, Kilkenny, Mairi, Pearl, Laurence and Oliver, Antony (2006) Structure of an archaeal PCNA1-PCNA2-FEN1 complex: elucidating PCNA subunit and client enzyme specificity. Nucleic Acids Research, 34 (16). pp. 4515-4526. ISSN 0305-1048

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Abstract

The archaeal/eukaryotic proliferating cell nuclear antigen (PCNA) toroidal clamp interacts with a host of DNA modifying enzymes, providing a stable anchorage and enhancing their respective processivities. Given the broad range of enzymes with which PCNA has been shown to interact, relatively little is known about the mode of assembly of functionally meaningful combinations of enzymes on the PCNA clamp. We have determined the X-ray crystal structure of the Sulfolobus solfataricus PCNA1–PCNA2 heterodimer, bound to a single copy of the flap endonuclease FEN1 at 2.9 Å resolution. We demonstrate the specificity of interaction of the PCNA subunits to form the PCNA1–PCNA2–PCNA3 heterotrimer, as well as providing a rationale for the specific interaction of the C-terminal PIP-box motif of FEN1 for the PCNA1 subunit. The structure explains the specificity of the individual archaeal PCNA subunits for selected repair enzyme ‘clients’, and provides insights into the co-ordinated assembly of sequential enzymatic steps in PCNA-scaffolded DNA repair cascades.

Item Type: Article
Schools and Departments: School of Life Sciences > Biochemistry
Depositing User: Mark Roe
Date Deposited: 06 Feb 2012 18:39
Last Modified: 13 Mar 2017 23:40
URI: http://sro.sussex.ac.uk/id/eprint/17577

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