Related Experiment Video

Updated: Jul 11, 2026

Bacterial Expression and Purification of Human Matrix Metalloproteinase-3 using Affinity Chromatography
07:32

Bacterial Expression and Purification of Human Matrix Metalloproteinase-3 using Affinity Chromatography

Published on: March 30, 2022

A biochemical model of matrix metalloproteinase 9 activation and inhibition

Prakash Vempati1, Emmanouil D Karagiannis, Aleksander S Popel

  • 1Department of Biomedical Engineering, School of Medicine, The Johns Hopkins University, Baltimore, MD 21205, USA. prakashvempati1@jhu.edu

The Journal of Biological Chemistry
|September 13, 2007
PubMed

Insights

This study models matrix metalloproteinase-9 (MMP9) activation and inhibition, revealing complex interactions with tissue inhibitors of metalloproteinases (TIMPs) that require more than a single binding event for accurate description.

Area of Science:

  • Biochemistry
  • Computational Biology
  • Enzymology

Background:

  • Matrix metalloproteinases (MMPs) are crucial extracellular proteases involved in physiological processes like angiogenesis.
  • Matrix metalloproteinase-9 (MMP9) plays a significant role in various biological functions.

Purpose of the Study:

  • To develop and validate a computational model for MMP9 activation and inhibition kinetics.
  • To investigate the detailed mechanisms of MMP9 interaction with its inhibitors, specifically TIMP1 and TIMP2.

Main Methods:

  • Computational modeling and numerical simulations.
  • Validation against existing biochemical experimental data.
  • Determination of kinetic rate constants for MMP9 activation, inhibition, and deactivation.

Main Results:

  • The model accurately predicts MMP9 activation by various proteases and inhibition by TIMP1 and TIMP2.
  • MMP9 inhibition by TIMP1 cannot be explained by a single binding event, suggesting a biphasic mechanism.
  • Theoretical characterization of MMP3/TIMP2/pro-MMP9 and MMP3/TIMP1/pro-MMP9 systems revealed significant differences in activation and inhibition time scales.

Conclusions:

  • The computational model provides a robust framework for understanding MMP9 kinetics.
  • Discrepancies in MMP9-TIMP1 interaction highlight the need for more complex models, potentially involving isomerization or multiple isoforms.
  • The study lays the foundation for future research on MMPs in defined physiological microenvironments.

More Related Videos

Detection of Functional Matrix Metalloproteinases by Zymography09:30

Detection of Functional Matrix Metalloproteinases by Zymography

Published on: November 8, 2010

Measuring Global Cellular Matrix Metalloproteinase and Metabolic Activity in 3D Hydrogels07:39

Measuring Global Cellular Matrix Metalloproteinase and Metabolic Activity in 3D Hydrogels

Published on: January 22, 2019

Related Concept Videos

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...
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...
The Extracellular Matrix01:29

The Extracellular Matrix

Overview
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...
The Extracellular Matrix01:42

The Extracellular Matrix

In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.Composition of the Extracellular MatrixThe extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse molecules.
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Enzyme Inhibition01:30

Enzyme Inhibition

Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.