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Strand-specific analysis shows protein binding at replication forks and PCNA unloading from lagging strands when forks stall
Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, USA.
Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, USA.
Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, USA.
Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, USA.
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2014 (English)In: Molecular Cell, ISSN 1097-2765, E-ISSN 1097-4164, Vol. 56, no 4, 551-563 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 56, no 4, 551-563 p.
National Category
Other Medical Sciences
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URN: urn:nbn:se:umu:diva-96791DOI: 10.1016/j.molcel.2014.09.017ISI: 000345502200011PubMedID: 25449133Scopus ID: 2-s2.0-84912091104OAI: oai:DiVA.org:umu-96791DiVA: diva2:768279
Funder
NIH (National Institute of Health), GM72719NIH (National Institute of Health), GM81838
Available from: 2014-12-03 Created: 2014-12-03 Last updated: 2017-12-05Bibliographically approved

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CiteExportLink to record
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