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Activity-based protein profiling: the serine hydrolases.

Y Liu1, M P Patricelli, B F Cravatt

  • 1The Skaggs Institute for Chemical Biology, Department of Cell Biology, the Scripps Research Institute, La Jolla, CA 92037, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 28, 1999
PubMed
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Researchers developed FP-biotin, a novel probe to visualize serine hydrolase enzyme activity and expression dynamics. This tool aids in assigning protein function and identifying drug targets in the post-genomic era.

Area of Science:

  • Biochemistry
  • Proteomics
  • Chemical Biology

Background:

  • The post-genomic era necessitates advanced methods for protein functional analysis.
  • Current proteomics primarily focuses on protein levels, not activity.
  • Profiling enzyme activity is crucial for function assignment and drug discovery.

Purpose of the Study:

  • To develop and validate a chemical probe for analyzing serine hydrolase enzyme family dynamics.
  • To enable visualization of both expression and activity of serine hydrolases.

Main Methods:

  • Chemical synthesis of a biotinylated fluorophosphonate probe (FP-biotin).
  • Application of FP-biotin to crude tissue extracts for high-sensitivity detection.
  • Kinetic analysis of FP-biotin labeling for activity-dependent monitoring.

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Main Results:

  • FP-biotin successfully detected numerous serine hydrolases in crude tissue extracts.
  • Many detected serine hydrolases exhibited tissue-restricted expression patterns.
  • Labeling was activity-dependent and kinetically trackable, revealing protein function and expression dynamics.

Conclusions:

  • FP-biotin is a versatile tool for profiling serine hydrolase activity and expression.
  • This probe accelerates the understanding of enzyme function and the identification of pharmaceutical targets.
  • The method allows simultaneous monitoring of protein function and expression dynamics.