RECQ1 interacts with FEN-1 and promotes binding of FEN-1 to telomeric chromatin

The Biochemical Journal
Furqan SamiSudha Sharma

Abstract

RecQ helicases are a family of highly conserved proteins that maintain genomic stability through their important roles in replication restart mechanisms. Cellular phenotypes of RECQ1 deficiency are indicative of aberrant repair of stalled replication forks, but the molecular functions of RECQ1, the most abundant of the five known human RecQ homologues, have remained poorly understood. We show that RECQ1 associates with FEN-1 (flap endonuclease-1) in nuclear extracts and exhibits direct protein interaction in vitro. Recombinant RECQ1 significantly stimulated FEN-1 endonucleolytic cleavage of 5'-flap DNA substrates containing non-telomeric or telomeric repeat sequence. RECQ1 and FEN-1 were constitutively present at telomeres and their binding to the telomeric chromatin was enhanced following DNA damage. Telomere residence of FEN-1 was dependent on RECQ1 since depletion of RECQ1 reduced FEN-1 binding to telomeres in unperturbed cycling cells. Our results confirm a conserved collaboration of human RecQ helicases with FEN-1 and suggest both overlapping and specialized roles of RECQ1 in the processing of DNA structure intermediates proposed to arise during replication, repair and recombination.

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Citations

Mar 23, 2017·Nature Reviews. Molecular Cell Biology·Pierre-Marie Dehé, Pierre-Henri L Gaillard
Apr 5, 2017·Cellular Microbiology·Miguel Sierra-MirandaRosaura Hernandez-Rivas
Mar 30, 2017·Genes·Mitsunori HigaKazumasa Yoshida
Aug 31, 2019·Nature Communications·Giulia BottoniG Paolo Dotto
Jun 11, 2020·Genes·Subrata Debnath, Sudha Sharma
Aug 25, 2019·The Journal of Biological Chemistry·Swetha Parvathaneni, Sudha Sharma
Nov 24, 2016·Biophysical Chemistry·Vaclav UrbanPavel Janscak

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