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• W1999472367 endingPage "128" @default.
• W1999472367 startingPage "119" @default.
• W1999472367 abstract "Pif1 proteins are helicases that in yeast are implicated in the maintenance of genome stability. One activity of Saccharomyces cerevisiae Pif1 is to stabilize DNA sequences that could otherwise form deleterious G4 (G-quadruplex) structures by acting as a G4 resolvase. The present study shows that human Pif1 (hPif1, nuclear form) is a G4 DNA-binding and resolvase protein and that these activities are properties of the conserved helicase domain (amino acids 206–620 of 641, hPifHD). hPif1 preferentially bound synthetic G4 DNA relative to ssDNA (single-stranded DNA), dsDNA (double-stranded DNA) and a partially single-stranded duplex DNA helicase substrate. G4 DNA unwinding, but not binding, required an extended (&gt;10 nucleotide) 5′ ssDNA tail, and in competition assays, G4 DNA was an ineffective suppressor of helicase activity compared with ssDNA. These results suggest a distinction between the determinants of G4 DNA binding and the ssDNA interactions required for helicase action and that hPif1 may act on G4 substrates by binding alone or as a resolvase. Human Pif1 could therefore have a role in processing G4 structures that arise in the single-stranded nucleic acid intermediates formed during DNA replication and gene expression." @default.
• W1999472367 created "2016-06-24" @default.
• W1999472367 creator A5003945838 @default.
• W1999472367 date "2010-07-28" @default.
• W1999472367 modified "2023-09-27" @default.
• W1999472367 title "Human Pif1 helicase is a G-quadruplex DNA-binding protein with G-quadruplex DNA-unwinding activity" @default.
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• W1999472367 doi "https://doi.org/10.1042/bj20100612" @default.
• W1999472367 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20524933" @default.
• W1999472367 hasPublicationYear "2010" @default.
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