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Mol Cell. 2014 Nov 20;56(4):551-63. doi: 10.1016/j.molcel.2014.09.017. Epub 2014 Oct 23.

Strand-specific analysis shows protein binding at replication forks and PCNA unloading from lagging strands when forks stall.

Author information

1
Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
2
Department of Medical Biochemistry and Biophysics, Umeå University, 901 87 Umeå, Sweden.
3
Division of Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA; Center for Individualized Medicine, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
4
Center for Individualized Medicine, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
5
Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA; Center for Individualized Medicine, Mayo Clinic College of Medicine, Rochester, MN 55905, USA. Electronic address: zhang.zhiguo@mayo.edu.

Erratum in

  • Mol Cell. 2014 Nov 20;56(4):609.

Abstract

In eukaryotic cells, DNA replication proceeds with continuous synthesis of leading-strand DNA and discontinuous synthesis of lagging-strand DNA. Here we describe a method, eSPAN (enrichment and sequencing of protein-associated nascent DNA), which reveals the genome-wide association of proteins with leading and lagging strands of DNA replication forks. Using this approach in budding yeast, we confirm the strand specificities of DNA polymerases delta and epsilon and show that the PCNA clamp is enriched at lagging strands compared with leading-strand replication. Surprisingly, at stalled forks, PCNA is unloaded specifically from lagging strands. PCNA unloading depends on the Elg1-containing alternative RFC complex, ubiquitination of PCNA, and the checkpoint kinases Mec1 and Rad53. Cells deficient in PCNA unloading exhibit increased chromosome breaks. Our studies provide a tool for studying replication-related processes and reveal a mechanism whereby checkpoint kinases regulate strand-specific unloading of PCNA from stalled replication forks to maintain genome stability.

PMID:
25449133
PMCID:
PMC4362665
DOI:
10.1016/j.molcel.2014.09.017
[Indexed for MEDLINE]
Free PMC Article

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