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Related Experiment Video

Updated: Apr 29, 2026

Detection of Protease Activity by Fluorescent Peptide Zymography
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Simple assay for proteases based on aggregation of stimulus-responsive polypeptides.

Ali Ghoorchian1, Ashutosh Chilkoti, Gabriel P López

  • 1NSF Research Triangle Materials Research Science and Engineering Center, Duke University , Durham, North Carolina 27708, United States.

Analytical Chemistry
|May 17, 2014
PubMed
Summary

A new assay detects protease activity using self-assembling polypeptides. This method allows simple, low-cost detection and quantification of proteases in biological samples for disease diagnosis and drug discovery.

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Area of Science:

  • Biochemistry
  • Biotechnology
  • Molecular Biology

Background:

  • Unregulated protease activity is implicated in various diseases, including cancer.
  • Development of rapid, accurate, and cost-effective assays is crucial for early disease diagnosis, monitoring, and drug discovery.
  • Current detection methods may lack simplicity, speed, or cost-effectiveness.

Purpose of the Study:

  • To develop a novel, simple assay for detecting and quantifying protease activity.
  • To demonstrate the assay's utility in buffer and human serum.
  • To establish a modular platform adaptable for detecting diverse proteases.

Main Methods:

  • Utilized recombinant diblock polypeptides that form micelles triggered by temperature or salt.
  • Incorporated a peptide substrate linking micelle coronae to water-insoluble cores.
  • Monitored protease-induced cleavage of the substrate, leading to core aggregation and a measurable change in optical density.

Main Results:

  • Successfully detected and quantified protease activity in buffer and human serum.
  • Demonstrated a linear relationship between peptide aggregation time and matrix metalloproteinase-1 (MMP-1) concentration.
  • Quantified MMP-1 over a range from endogenous levels (∼3 ng/mL) to 100 ng/mL in human serum and buffer.

Conclusions:

  • The developed assay offers a simple, rapid, and cost-effective method for protease detection.
  • The assay's modular design allows for adaptation to various protease targets.
  • This methodology holds promise for applications in disease diagnostics and drug discovery.