Monitoring Replication Protein A (RPA) Dynamics in Homologous Recombination Through Site-specific Incorporation of Non-canonical Amino Acids

Authors

Nilisha Pokhrel, Marquette University
Sofia Origanti, Marquette UniversityFollow
Eric Parker Davenport, Marquette University
Disha M. Gandhi, Marquette UniversityFollow
Kyle Kaniecki, Columbia University
Ryan A. Mehl, Oregon State University
Eric C. Greene, Columbia University
Chris Dockendorff, Marquette UniversityFollow
Edwin Antony, Marquette UniversityFollow

Document Type

Article

Language

eng

Publication Date

9-19-2017

Publisher

Oxford University Press

Source Publication

Nucleic Acids Research

Source ISSN

0305-1048

Abstract

An essential coordinator of all DNA metabolic processes is Replication Protein A (RPA). RPA orchestrates these processes by binding to single-stranded DNA (ssDNA) and interacting with several other DNA binding proteins. Determining the real-time kinetics of single players such as RPA in the presence of multiple DNA processors to better understand the associated mechanistic events is technically challenging. To overcome this hurdle, we utilized non-canonical amino acids and bio-orthogonal chemistry to site-specifically incorporate a chemical fluorophore onto a single subunit of heterotrimeric RPA. Upon binding to ssDNA, this fluorescent RPA (RPAf) generates a quantifiable change in fluorescence, thus serving as a reporter of its dynamics on DNA in the presence of multiple other DNA binding proteins. Using RPAf, we describe the kinetics of facilitated self-exchange and exchange by Rad51 and mediator proteins during various stages in homologous recombination. RPAf is widely applicable to investigate its mechanism of action in processes such as DNA replication, repair and telomere maintenance.

Comments

Published version. Nucleic Acids Research, Vol. 45, No. 16 (September 19, 2017): 9413-9426. DOI.

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License

Recommended Citation

Pokhrel, Nilisha; Origanti, Sofia; Davenport, Eric Parker; Gandhi, Disha M.; Kaniecki, Kyle; Mehl, Ryan A.; Greene, Eric C.; Dockendorff, Chris; and Antony, Edwin, "Monitoring Replication Protein A (RPA) Dynamics in Homologous Recombination Through Site-specific Incorporation of Non-canonical Amino Acids" (2017). Biological Sciences Faculty Research and Publications. 603.
https://epublications.marquette.edu/bio_fac/603