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Related Experiment Video

Updated: Jun 13, 2025

The Determination of Protease Specificity in Mouse Tissue Extracts by MALDI-TOF Mass Spectrometry: Manipulating PH to Cause Specificity Changes
09:47

The Determination of Protease Specificity in Mouse Tissue Extracts by MALDI-TOF Mass Spectrometry: Manipulating PH to Cause Specificity Changes

Published on: May 25, 2018

6.8K

High resolution analysis of proteolytic substrate processing.

Jasmin Schillinger1, Michelle Koci1, Kenny Bravo-Rodriguez2

  • 1Center of Medical Biotechnology, Faculty of Biology, University Duisburg-Essen, Essen, Germany.

The Journal of Biological Chemistry
|September 23, 2024
PubMed
Summary

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This summary is machine-generated.

The high-temperature requirement A serine protease (HtrA) degrades folded proteins. This study reveals detailed molecular insights into how human HTRA1 processes folded ANXA1, uncovering specific cleavage sites and degradation patterns.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • The high-temperature requirement A (HtrA) serine proteases are crucial for protein quality control, primarily degrading misfolded proteins.
  • Emerging evidence indicates that HtrA proteases can also process native, folded proteins.
  • Understanding the mechanism of folded protein degradation by HtrA is essential for comprehending cellular protein homeostasis.

Purpose of the Study:

  • To investigate the detailed mechanism by which human HTRA1 processes and degrades the folded protein ANXA1.
  • To provide high-resolution molecular insights into protease-substrate interactions during protein degradation.

Main Methods:

  • Employed an integrated quantitative approach combining time-resolved mass spectrometry, circular dichroism (CD) spectroscopy, and bioinformatics.
Keywords:
ANXA1HTRA1bioinformaticsprotein degradationprotein processingproteolysistrypsin

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Last Updated: Jun 13, 2025

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  • Analyzed the degradation of folded ANXA1 by human HTRA1.

    • Main Results:

    • Identified up to 178 individual proteolytic sites on the 346-amino acid ANXA1 substrate.
    • Quantified the frequency of cleavage at each site and determined the protease's sequence preferences around the scissile bond.
    • Characterized the sequential structural relaxation and unfolding of ANXA1 during its progressive degradation by HTRA1.

    Conclusions:

    • The study provides precise molecular insights into the degradation of folded proteins by HTRA1.
    • The developed workflow can be adapted to study other posttranslational modifications, such as phosphorylation, in dynamic protein complexes.
    • This research deepens the understanding of HtrA protease function in protein quality control and substrate processing.