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Ewing Sarcoma Related protein 1 recognizes R-loops by binding DNA forks.

Michelle A Lay1,2,3, Valery F Thompson1,2, Ajibola D Adelakun1,2,4

  • 1Department of Pharmacology, University of Arizona, Tucson, AZ 85724, USA.

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Summary
This summary is machine-generated.

Ewing Sarcoma Related protein 1 (EWSR1) binds R-loops, structures linked to genomic stress. Its Zinc-finger and RNA recognition motifs enable specific DNA fork recognition, crucial for R-loop regulation.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • EWSR1 (Ewing Sarcoma Related protein 1) is a ubiquitous RNA-binding protein involved in RNA processing.
  • Dysregulation of EWSR1 is linked to increased R-loops, which cause genomic and transcription stress.
  • R-loops are nucleic acid structures comprising a DNA:RNA hybrid and a displaced single-stranded DNA.

Approach:

  • Investigated the specific mechanism by which EWSR1 recognizes R-loop structures.
  • Utilized electrophoretic mobility shift assays (EMSA) to assess EWSR1 binding affinity to R-loop components.
  • Focused on identifying the specific domains within EWSR1 responsible for R-loop recognition and specificity.

Key Points:

  • EWSR1 exhibits high-affinity binding to substrates mimicking R-loop structures.
  • Specificity of EWSR1 binding is localized to the DNA fork region of R-loops.
  • The Zinc-finger (ZnF) and RNA recognition motif (RRM) domains, along with flanking RGG domains, are critical for EWSR1's binding affinity and specificity.

Conclusions:

  • EWSR1's ZnF and RGG domains mediate high-affinity binding to R-loop DNA forks.
  • EWSR1's RRM and RGG domains enhance specificity for R-loop structures.
  • This domain-based recognition mechanism explains EWSR1's role in regulating R-loops across various cellular contexts.