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Updated: Feb 2, 2026

Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers
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Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers

Published on: July 25, 2012

12.1K

MT1-MMP Binds Membranes by Opposite Tips of Its β Propeller to Position It for Pericellular Proteolysis

Tara C Marcink1, Jayce A Simoncic1, Bo An2

  • 1Department of Biochemistry, University of Missouri, 117 Schweitzer Hall, Columbia, MO 65211, USA.

Structure (London, England : 1993)
|November 26, 2018
PubMed

Insights

The hemopexin-like domain of membrane type 1 matrix metalloproteinase (MT1-MMP) interacts with cell membranes, facilitating collagen proteolysis crucial for tumor cell migration.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Membrane type 1 matrix metalloproteinase (MT1-MMP) is critical for tumor and endothelial cell migration.
  • MT1-MMP facilitates migration through proteolytic degradation of extracellular matrix components like collagen.
  • Understanding MT1-MMP's interaction with cell membranes is key to its function.

Purpose of the Study:

  • To investigate the lipid bilayer interactions of the hemopexin-like (HPX) domain of MT1-MMP.
  • To elucidate how HPX domain binding influences MT1-MMP's enzymatic activity and substrate accessibility.

Main Methods:

  • Paramagnetic nuclear magnetic resonance relaxation enhancements (PREs).
  • Fluorescence spectroscopy.
  • Site-directed mutagenesis.
  • PRE-restrained molecular dynamics simulations.

Main Results:

  • The HPX domain binds to lipid bilayers via blades II and IV.
  • The EPGYPK sequence inserts into phospholipid head groups.
  • Bilayer binding, particularly via blade IV, facilitates collagen binding and proteolysis.
  • Binding to either blade II or IV exposes the CD44 binding site.

Conclusions:

  • MT1-MMP's HPX domain plays a crucial role in membrane association and substrate presentation.
  • Bilayer interaction enhances MT1-MMP's proteolytic activity on collagen.
  • Potential MT1-MMP homodimerization could mediate binding to multiple substrates and membranes.
Keywords:
FRETNMRcollagen triple helixmembrane associationmembrane type matrix metalloproteinasenanodiscsparamagnetic relaxation enhancementpericellular collagenolysisperipheral membrane proteinrestrained molecular dynamics

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