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Single-Molecule Analysis of Replication Protein A-DNA Interactions.

Fletcher E Bain1, Laura A Fischer1, Ran Chen2

  • 1University of Iowa Carver College of Medicine, Iowa City, IA, United States.

Methods in Enzymology
|February 21, 2018
PubMed
Summary

Replication protein A (RPA), crucial for genome stability, binds single-stranded DNA (ssDNA) and partners. Single-molecule experiments using TIRFM reveal RPA-DNA interactions and dynamics.

Keywords:
Biotin labelingFluorescent protein labelingRPAReplication protein ASingle-stranded DNA bindingTIRFM

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • Replication protein A (RPA) is a vital eukaryotic protein complex that binds single-stranded DNA (ssDNA).
  • RPA plays a critical role in maintaining genome stability through its involvement in DNA replication, repair, and recombination.
  • Understanding RPA's molecular interactions and dynamics is key to deciphering its cellular functions.

Purpose of the Study:

  • To detail methods for expressing, purifying, and labeling human RPA for biophysical studies.
  • To describe the setup and execution of single-molecule experiments investigating RPA-DNA interactions.
  • To provide guidance on analyzing data obtained from total internal reflection fluorescence microscopy (TIRFM) of RPA-DNA interactions.

Main Methods:

  • Protein expression, purification, and labeling of human RPA.
  • Preparation of materials for single-molecule assays.
  • Total internal reflection fluorescence microscopy (TIRFM) for observing RPA-DNA interactions in real-time.
  • Data analysis techniques specific to TIRFM experiments.

Main Results:

  • Establishment of protocols for producing functional, labeled human RPA.
  • Demonstration of a robust single-molecule TIRFM approach to study RPA binding dynamics.
  • Methods for quantitative analysis of RPA-DNA interactions at the single-molecule level.

Conclusions:

  • The described methods enable detailed investigation of human RPA-DNA interactions.
  • Single-molecule TIRFM provides insights into the dynamics underlying RPA's role in genome stability.
  • These techniques are adaptable for studying RPA homologs in other species.