Skip to main content
placeholder image

Single-molecule live-cell imaging visualizes parallel pathways of prokaryotic nucleotide excision repair

Journal Article


Download full-text (Open Access)

Abstract


  • In the model organism Escherichia coli, helix distorting lesions are recognized by the UvrAB damage surveillance complex in the global genomic nucleotide excision repair pathway (GGR). Alternately, during transcription-coupled repair (TCR), UvrA is recruited to Mfd at sites of RNA polymerases stalled by lesions. Ultimately, damage recognition is mediated by UvrA, followed by verification by UvrB. Here we characterize the differences in the kinetics of interactions of UvrA with Mfd and UvrB by following functional, fluorescently tagged UvrA molecules in live TCR-deficient or wild-type cells. The lifetimes of UvrA in Mfd-dependent or Mfd-independent interactions in the absence of exogenous DNA damage are comparable in live cells, and are governed by UvrB. Upon UV irradiation, the lifetimes of UvrA strongly depended on, and matched those of Mfd. Overall, we illustrate a non-perturbative, imaging-based approach to quantify the kinetic signatures of damage recognition enzymes participating in multiple pathways in cells.

Publication Date


  • 2020

Citation


  • Ghodke, H., Ho, H. & van Oijen, A. (2020). Single-molecule live-cell imaging visualizes parallel pathways of prokaryotic nucleotide excision repair. Nature Communications, 11 (1), 1477.

Scopus Eid


  • 2-s2.0-85082148153

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2290&context=smhpapers1

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers1/1272

Has Global Citation Frequency


Start Page


  • 1477

Volume


  • 11

Issue


  • 1

Place Of Publication


  • United Kingdom

Abstract


  • In the model organism Escherichia coli, helix distorting lesions are recognized by the UvrAB damage surveillance complex in the global genomic nucleotide excision repair pathway (GGR). Alternately, during transcription-coupled repair (TCR), UvrA is recruited to Mfd at sites of RNA polymerases stalled by lesions. Ultimately, damage recognition is mediated by UvrA, followed by verification by UvrB. Here we characterize the differences in the kinetics of interactions of UvrA with Mfd and UvrB by following functional, fluorescently tagged UvrA molecules in live TCR-deficient or wild-type cells. The lifetimes of UvrA in Mfd-dependent or Mfd-independent interactions in the absence of exogenous DNA damage are comparable in live cells, and are governed by UvrB. Upon UV irradiation, the lifetimes of UvrA strongly depended on, and matched those of Mfd. Overall, we illustrate a non-perturbative, imaging-based approach to quantify the kinetic signatures of damage recognition enzymes participating in multiple pathways in cells.

Publication Date


  • 2020

Citation


  • Ghodke, H., Ho, H. & van Oijen, A. (2020). Single-molecule live-cell imaging visualizes parallel pathways of prokaryotic nucleotide excision repair. Nature Communications, 11 (1), 1477.

Scopus Eid


  • 2-s2.0-85082148153

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2290&context=smhpapers1

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers1/1272

Has Global Citation Frequency


Start Page


  • 1477

Volume


  • 11

Issue


  • 1

Place Of Publication


  • United Kingdom