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Activity assays for poly-ADP ribose polymerase
Eva Kirsten1, Ernest Kun, Jerome Mendeleyev
1Department of Anatomy, Cardiovascular Research Institute, School of Medicine, University of California, San Francisco, USA.
Methods in Molecular Biology (Clifton, N.J.)
|July 27, 2004
Summary
Poly(ADP-ribose) polymerase-1 (PARP-1) uses double-stranded DNA (dsDNA) more efficiently than damaged DNA (dcDNA) as a coenzyme. New methods allow studying PARP-1
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Poly(ADP-ribose) polymerase-1 (PARP-1) is a nuclear enzyme.
- Traditionally, PARP-1 was thought to require discontinuous DNA (dcDNA) as a coenzyme, limiting research to DNA repair and apoptosis.
- Recent findings indicate PARP-1's involvement in normal cellular functions like chromatin modeling and gene regulation, even without DNA breaks.
Purpose of the Study:
- To present detailed methods for analyzing PARP-1 enzymatic activity.
- To compare the use of double-stranded DNA (dsDNA) versus damaged DNA (dcDNA) as coenzymes for PARP-1.
- To facilitate investigation into the physiological roles of PARP-1 in normal cells.
Main Methods:
- Development of assays to analyze PARP-1 enzymatic activity.
- Utilizing dsDNA as a coenzyme, contrasting with dcDNA.
- Specific procedures for analyzing auto-ADP-ribosylation and trans-ADP-ribosylation.
Main Results:
- Demonstrated that dsDNA is a more efficient coenzyme for PARP-1 than dcDNA.
- Established a mechanistic basis for PARP-1 function in normal cell physiology.
- Provided validated methods for studying PARP-1 activity.
Conclusions:
- PARP-1 functions efficiently with dsDNA, extending its known roles beyond DNA repair.
- The developed assays enable the study of PARP-1 in normal cellular processes.
- This research opens new avenues for understanding PARP-1's physiological significance.