Related Experiment Video

Updated: Oct 15, 2026

Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers
10:08

Multiplexed Single-molecule Force Proteolysis Measurements Using Magnetic Tweezers

Published on: July 25, 2012

Atomic force microscopy-based detection of binding and cleavage site of matrix metalloproteinase on individual type

H B Sun1, G N Smith, K A Hasty

  • 1Biomedical Engineering Program, Department of Anatomy and Cell Biology, Rheumatology Division, Indiana University-Purdue University at Indianapolis, Indiana University School of Medicine, Indiana, Indianapolis 46202, USA.

Analytical Biochemistry
|July 25, 2000
PubMed

Insights

Atomic force microscopy visualized matrix metalloproteinase 8 (MMP-8) binding and cleaving collagen. This study reveals specific collagen cleavage sites despite multiple binding locations, advancing enzyme-substrate interaction understanding.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Collagen is a crucial structural protein.
  • Matrix metalloproteinase 8 (MMP-8) is a collagenase involved in tissue remodeling.
  • Understanding enzyme-substrate interactions at a molecular level is essential.

Purpose of the Study:

  • To visualize and characterize the interaction between matrix metalloproteinase 8 (MMP-8) and type II tropocollagen molecules.
  • To identify specific binding and cleavage sites of MMP-8 on collagen using atomic force microscopy (AFM).

Main Methods:

  • Type II tropocollagen molecules were immobilized on an atomically flat surface.
  • Atomic force microscopy (AFM) was used to visualize individual collagen molecules and MMP-8:collagen complexes.
  • MMP-8 was reacted with immobilized collagen to detect binding and cleavage sites.

Main Results:

  • Direct visualization of MMP-8:collagen complexes revealed heterogeneous binding characteristics.
  • Multiple non-specific MMP-8 binding sites were observed on collagen molecules.
  • Cleavage of collagen by MMP-8 occurred consistently at a unique site, visualized as a gap in stretched molecules.

Conclusions:

  • This study provides the first visual evidence of direct collagenase:collagen interactions using AFM.
  • The findings highlight the specificity of MMP-8 cleavage despite multiple binding sites.
  • AFM offers a powerful tool for analyzing protein interactions and enzyme mechanisms.

More Related Videos

2D and 3D Matrices to Study Linear Invadosome Formation and Activity12:25

2D and 3D Matrices to Study Linear Invadosome Formation and Activity

Published on: June 2, 2017

Imaging Denatured Collagen Strands In vivo and Ex vivo via Photo-triggered Hybridization of Caged Collagen Mimetic Peptides07:03

Imaging Denatured Collagen Strands In vivo and Ex vivo via Photo-triggered Hybridization of Caged Collagen Mimetic Peptides

Published on: January 31, 2014

Related Concept Videos

Fibril-associated Collagen01:11

Fibril-associated Collagen

Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult body.
A...
Studying the Cytoskeleton01:17

Studying the Cytoskeleton

The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...