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In Vitro Techniques for ADP-Ribosylated Substrate Identification.

Giovanna Grimaldi1, Giuliana Catara1, Carmen Valente1

  • 1Institute of Protein Biochemistry, National Research Council, Naples, Italy.

Methods in Molecular Biology (Clifton, N.J.)
|August 12, 2018
PubMed
Summary

Researchers developed a new method to identify ADP-ribosylated proteins using a specific protein domain. This technique aids in understanding the physiological roles and regulation of ADP-ribosylation.

Keywords:
ADP-riboseADP-ribosylated substratesADP-ribosylationARTAf1521 macro-domain purificationDMP cross-linkerMacro domainMacro-domain-based pulldownPARPARP

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Area of Science:

  • Biochemistry
  • Proteomics
  • Molecular Biology

Background:

  • ADP-ribosylation is a crucial post-translational protein modification.
  • Understanding its physiological roles requires identifying specific enzymes and substrates.
  • Existing methods for identifying ADP-ribosylated proteins are limited.

Purpose of the Study:

  • To develop a novel method for the efficient separation and identification of ADP-ribosylated proteins.
  • To enable a comprehensive analysis of ADP-ribosylation targets in biological systems.

Main Methods:

  • Utilized the ADP-ribose-binding macro domain of the thermophilic protein Af1521, coupled to affinity resin.
  • Employed an affinity-based pull-down assay.
  • Incorporated a specificity step using a mutated macro domain to remove non-specific binders.
  • Coupled the method with mass spectrometry for protein identification.

Main Results:

  • Successfully separated and identified both mono- and poly-ADP-ribosylated proteins.
  • Demonstrated the efficacy of the macro domain-based affinity purification.
  • Provided a robust approach for unbiased discovery of ADP-ribosylation substrates.

Conclusions:

  • The developed method offers a powerful tool for studying ADP-ribosylation.
  • Facilitates the elucidation of the physiological functions and regulatory mechanisms of ADP-ribosylation.
  • Opens new avenues for research in cellular signaling and disease.