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Structural basis for the initiation of eukaryotic transcription-coupled DNA repair.

Authors
  • Xu, Jun1
  • Lahiri, Indrajit2
  • Wang, Wei1
  • Wier, Adam2
  • Cianfrocco, Michael A2
  • Chong, Jenny1
  • Hare, Alissa A3
  • Dervan, Peter B3
  • DiMaio, Frank4
  • Leschziner, Andres E2, 5
  • Wang, Dong1, 2
  • 1 Division of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, USA.
  • 2 Department of Cellular & Molecular Medicine, School of Medicine, University of California San Diego, La Jolla, California 92093, USA.
  • 3 Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
  • 4 Department of Biochemistry, University of Washington, Seattle, Washington 98195, USA.
  • 5 Section of Molecular Biology, Division of Biological Sciences, University of California San Diego, La Jolla, California 92093, USA.
Type
Published Article
Journal
Nature
Publisher
Springer Nature
Publication Date
Nov 30, 2017
Volume
551
Issue
7682
Pages
653–657
Identifiers
DOI: 10.1038/nature24658
PMID: 29168508
Source
Medline
Language
English
License
Unknown

Abstract

Eukaryotic transcription-coupled repair (TCR) is an important and well-conserved sub-pathway of nucleotide excision repair that preferentially removes DNA lesions from the template strand that block translocation of RNA polymerase II (Pol II). Cockayne syndrome group B (CSB, also known as ERCC6) protein in humans (or its yeast orthologues, Rad26 in Saccharomyces cerevisiae and Rhp26 in Schizosaccharomyces pombe) is among the first proteins to be recruited to the lesion-arrested Pol II during the initiation of eukaryotic TCR. Mutations in CSB are associated with the autosomal-recessive neurological disorder Cockayne syndrome, which is characterized by progeriod features, growth failure and photosensitivity. The molecular mechanism of eukaryotic TCR initiation remains unclear, with several long-standing unanswered questions. How cells distinguish DNA lesion-arrested Pol II from other forms of arrested Pol II, the role of CSB in TCR initiation, and how CSB interacts with the arrested Pol II complex are all unknown. The lack of structures of CSB or the Pol II-CSB complex has hindered our ability to address these questions. Here we report the structure of the S. cerevisiae Pol II-Rad26 complex solved by cryo-electron microscopy. The structure reveals that Rad26 binds to the DNA upstream of Pol II, where it markedly alters its path. Our structural and functional data suggest that the conserved Swi2/Snf2-family core ATPase domain promotes the forward movement of Pol II, and elucidate key roles for Rad26 in both TCR and transcription elongation.

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