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Palmitoylated proteins: purification and identification.

Junmei Wan1, Amy F Roth, Aaron O Bailey

  • 1Department of Pharmacology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.

Nature Protocols
|June 23, 2007
PubMed
Summary
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This study presents a proteomic method to identify palmitoylated proteins using acyl-biotinyl exchange chemistry. The technique enables semi-quantitative analysis of global palmitoylation changes, aiding drug and mutation studies.

Area of Science:

  • Biochemistry
  • Proteomics
  • Molecular Biology

Background:

  • Palmitoylation, a type of S-acylation, is a reversible post-translational modification crucial for protein function.
  • Identifying palmitoylated proteins in complex biological samples is challenging due to the dynamic nature of the modification.

Purpose of the Study:

  • To develop and validate a robust proteomic protocol for the purification and identification of palmitoylated proteins.
  • To enable semi-quantitative analysis of global palmitoylation profiles to assess the impact of mutations or drugs.

Main Methods:

  • The protocol utilizes acyl-biotinyl exchange chemistry involving three in vitro steps: thiol blockade, thioester cleavage, and biotin labeling.
  • Biotinylated proteins are affinity-purified using streptavidin-agarose.

Related Experiment Videos

  • Protein identification and semi-quantification are performed using multi-dimensional protein identification technology (MuDPIT) coupled with tandem mass spectrometry (MS/MS).

    • Main Results:

    • The method successfully purifies and identifies palmitoylated proteins from complex extracts.
    • MuDPIT analysis provides semi-quantitative data on global palmitoylation patterns.
    • The entire analysis typically takes 2-3 weeks.

    Conclusions:

    • This acyl-biotinyl exchange-based proteomic protocol is effective for identifying and semi-quantifying palmitoylated proteins.
    • The method offers a valuable tool for studying the biological roles of palmitoylation and its alterations in disease or response to therapeutics.