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Molecules. 2019 May 7;24(9). pii: E1774. doi: 10.3390/molecules24091774.

A Novel G-Quadruplex Binding Protein in Yeast-Slx9.

Author information

1
University of Groningen, University Medical Center Groningen, European Research Institute for the Biology of Ageing, 9713 AV Groningen, The Netherlands. goetzsilvia@yahoo.de.
2
University of Würzburg, Department of Biochemistry, Biocentre, 97074 Würzburg, Germany. goetzsilvia@yahoo.de.
3
Current address: Indian Institute of Technology, Department of Biosciences and Bioengineering, Powai, Mumbai 400076, India. goetzsilvia@yahoo.de.
4
University Hospital Bonn, Department of Oncology, Hematology and Rheumatology, 53127 Bonn, Germany. goetzsilvia@yahoo.de.
5
University of Groningen, University Medical Center Groningen, European Research Institute for the Biology of Ageing, 9713 AV Groningen, The Netherlands. katrin.paeschke@ukbonn.de.
6
University of Würzburg, Department of Biochemistry, Biocentre, 97074 Würzburg, Germany. katrin.paeschke@ukbonn.de.
7
University Hospital Bonn, Department of Oncology, Hematology and Rheumatology, 53127 Bonn, Germany. katrin.paeschke@ukbonn.de.

Abstract

G-quadruplex (G4) structures are highly stable four-stranded DNA and RNA secondary structures held together by non-canonical guanine base pairs. G4 sequence motifs are enriched at specific sites in eukaryotic genomes, suggesting regulatory functions of G4 structures during different biological processes. Considering the high thermodynamic stability of G4 structures, various proteins are necessary for G4 structure formation and unwinding. In a yeast one-hybrid screen, we identified Slx9 as a novel G4-binding protein. We confirmed that Slx9 binds to G4 DNA structures in vitro. Despite these findings, Slx9 binds only insignificantly to G-rich/G4 regions in Saccharomyces cerevisiae as demonstrated by genome-wide ChIP-seq analysis. However, Slx9 binding to G4s is significantly increased in the absence of Sgs1, a RecQ helicase that regulates G4 structures. Different genetic and molecular analyses allowed us to propose a model in which Slx9 recognizes and protects stabilized G4 structures in vivo.

KEYWORDS:

G-quadruplex formation; RecQ helicase; S. cerevisiae; genome stability; protein–DNA interaction

PMID:
31067825
PMCID:
PMC6539110
DOI:
10.3390/molecules24091774
[Indexed for MEDLINE]
Free PMC Article

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