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Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications

Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications

Published on: April 21, 2023

Visualization of a DNA-PK/PARP1 complex.

Laura Spagnolo¹, Jody Barbeau, Nicola J Curtin

¹Cancer Research UK DNA Repair Enzymes Group, The Institute of Cancer Research, London SW3 6JB, UK. laura.spagnolo@ed.ac.uk

Nucleic Acids Research

|January 7, 2012

Summary

This summary is machine-generated.

DNA-dependent protein kinase (DNA-PK) and Poly(ADP-ribose) polymerase-1 (PARP1) are essential for rapid DNA repair. Their interaction and conformational changes in DNA-PK dimers are crucial for double-strand break repair.

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Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications

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Visualizing Single-Stranded DNA Foci in the G1 Phase of the Cell Cycle

Visualizing Single-Stranded DNA Foci in the G1 Phase of the Cell Cycle

Published on: December 22, 2023

Area of Science:

Molecular Biology
Biochemistry
Genetics

Background:

DNA-dependent protein kinase (DNA-PK) and Poly(ADP-ribose) polymerase-1 (PARP1) are key enzymes involved in DNA damage repair.
Both enzymes are activated by DNA strand breaks and have known interactions.

Purpose of the Study:

To provide in vivo evidence for the necessity of DNA-PK and PARP1 in rapid DNA repair.
To elucidate the structural and functional relationship between DNA-PK and PARP1 during DNA repair.

Main Methods:

Purification of a DNA-PK/PARP1 complex loaded on DNA.
Electron microscopy and single particle analysis of the complex.
Comparison with DNA-PK holoenzyme and fitting of crystallographic structures.

Main Results:

DNA-PK and PARP1 were found to be equally necessary for rapid DNA repair.
PARP1 density was observed in close contact with the Ku subunit of DNA-PK.
PARP1 binding induced significant conformational changes in the DNA-PK synaptic dimer assembly.

Conclusions:

The study supports a functional, in-pathway role for DNA-PK and PARP1 in double-strand break (DSB) repair.
A Non-Homologous End Joining (NHEJ) model is proposed where protein-protein interactions alter DNA-PK dimer architecture at DSBs.