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HuttonetalNucleicAcidsResearch38_5PCNAandXPF.pdf4.83 MBAdobe PDFView/Open
Title: PCNA and XPF cooperate to distort DNA substrates
Authors: Hutton, Richard David
Craggs, Timothy David
White, Malcolm F
Penedo, Carlos
Keywords: Single-stranded-DNA
Heterotrimeric PCNA
Flap endonuclease-1
Structural basis
QH426 Genetics
Issue Date: Mar-2010
Citation: Hutton , R D , Craggs , T D , White , M F & Penedo , C 2010 , ' PCNA and XPF cooperate to distort DNA substrates ' Nucleic Acids Research , vol 38 , no. 5 , pp. 1664-1675 . , 10.1093/nar/gkp1104
Abstract: XPF is a structure-specific endonuclease that preferentially cleaves 3' DNA flaps during a variety of repair processes. The crystal structure of a crenarchaeal XPF protein bound to a DNA duplex yielded insights into how XPF might recognise branched DNA structures, and recent kinetic data have demonstrated that the sliding clamp PCNA acts as an essential cofactor, possibly by allowing XPF to distort the DNA structure into a proper conformation for efficient cleavage to occur. Here, we investigate the solution structure of the 3'-flap substrate bound to XPF in the presence and absence of PCNA using intramolecular Forster resonance energy transfer (FRET). We demonstrate that recognition of the flap substrate by XPF involves major conformational changes of the DNA, including a 90 degrees kink of the DNA duplex and organization of the single-stranded flap. In the presence of PCNA, there is a further substantial reorganization of the flap substrate bound to XPF, providing a structural basis for the observation that PCNA has an essential catalytic role in this system. The wider implications of these observations for the plethora of PCNA-dependent enzymes are discussed.
Version: Publisher PDF
Status: Peer reviewed
ISSN: 0305-1048
Type: Journal article
Rights: © The Author(s) 2009. Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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