Related Experiment Video
Updated: May 29, 2026
10:12
Quantitative Detection of DNA-Protein Crosslinks and Their Post-Translational Modifications
Published on: April 21, 2023
Assay for protein modification by poly-ADP-ribose in vitro
Opeyemi A Olabisi1, Chi-Wing Chow
1Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA.
Methods in Molecular Biology (Clifton, N.J.)
|August 27, 2011
Summary
Researchers identified a specific glutamate residue in NFAT protein modified by poly(ADP-ribose) polymerase (PARP). This finding advances understanding of DNA repair and gene transcription mechanisms.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Poly(ADP-ribose) polymerase (PARP) enzymes are crucial for DNA repair, gene transcription, and cell differentiation.
- PARP enzymes catalyze the synthesis of poly(ADP-ribose) (pADPr) chains, modifying target proteins.
Purpose of the Study:
- To identify specific amino acid residues that serve as acceptors for pADPr modification in nuclear proteins.
- To develop a model approach for identifying pADPr acceptors in other nuclear proteins.
Main Methods:
- Utilized recombinant proteins for in vitro studies.
- Employed an in vitro pADP ribosylation assay.
- Applied mass spectrometry for precise identification of modified residues.
Main Results:
- Identified a conserved glutamate (Glu) residue in the transcription factor NFAT.
- Demonstrated that this Glu residue is enzymatically modified by PARP-1 with pADPr in vitro.
- Overcame challenges posed by the heterogeneity of pADPr chains and unpredictable protein masses.
Conclusions:
- The study successfully identified a specific pADPr acceptor site in NFAT.
- The developed protocol serves as a model for identifying pADPr acceptors in other nuclear proteins.
- This research contributes to understanding PARP-mediated protein modification in cellular processes.
