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Updated: May 9, 2026
10:12
Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications
Published on: April 21, 2023
DNA-dependent SUMO modification of PARP-1
Nicola Zilio1, Chris T Williamson, Sebastian Eustermann
1Cancer Research UK London Research Institute, Clare Hall Laboratories, Blanche Lane, South Mimms EN6 3LD, United Kingdom.
DNA Repair
|July 23, 2013
Summary
DNA binding enhances Poly(ADP-ribose) polymerase 1 (PARP-1) sumoylation, impacting its role in gene transcription. This modification, distinct from DNA damage response, suggests PARP-1 uses DNA recognition to regulate its functions.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Poly(ADP-ribose) polymerase 1 (PARP-1) is crucial for DNA repair and transcriptional regulation.
- SUMOylation of PARP-1 influences its co-activator function for hypoxia-responsive genes and heat shock promoters.
Purpose of the Study:
- To investigate the influence of DNA on PARP-1 sumoylation.
- To elucidate the mechanism by which DNA affects PARP-1 sumoylation and its functional implications.
Main Methods:
- In vitro sumoylation assays with intact and damaged DNA.
- Analysis of PARP-1 catalytic activity and DNA-binding properties.
- In vivo chromatin association studies of sumoylated PARP-1.
Main Results:
- PARP-1 sumoylation is enhanced by binding to intact DNA, independent of DNA damage.
- DNA binding increases PARP-1 affinity for Ubc9, the SUMO-conjugating enzyme.
- Sumoylation does not alter PARP-1's catalytic or DNA-binding capabilities.
- In vivo, sumoylated PARP-1 localizes to chromatin but is not regulated by DNA damage or PARP-1 activity.
Conclusions:
- PARP-1 sumoylation is regulated by DNA binding, suggesting a mechanism for differential functional regulation.
- Distinct DNA recognition modes allow PARP-1 to modulate different cellular processes, including transcription.
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