Related Experiment Video
Updated: Jun 12, 2026
04:30
Quantifying the Modulation of Elastase Enzyme Activity Through Colorimetric Analysis
Published on: January 17, 2025
Paradoxical interactions between modifiers and elastase-2
Patricia Schenker1, Antonio Baici
1Department of Biochemistry, University of Zurich, Zurich, Switzerland.
The FEBS Journal
|June 18, 2010
Summary
Glycosaminoglycans modulate human leukocyte elastase-2 activity. Their concentration determines whether they inhibit or activate this enzyme, impacting extracellular matrix remodeling and degradation.
Area of Science:
- Biochemistry
- Cell Biology
- Enzymology
Background:
- Human polymorphonuclear leukocyte elastase-2 (HLE) is a serine endopeptidase involved in extracellular matrix (ECM) remodeling and degradation.
- Proteoglycans and their associated glycosaminoglycans (GAGs) are key components of the ECM and potential interactors with HLE.
Purpose of the Study:
- To investigate the interaction between glycosaminoglycans and elastase-2.
- To elucidate the role of glycosaminoglycans in modulating elastase-2 activity and its inhibition by natural protein inhibitors.
Main Methods:
- In vitro enzyme assays were performed to study the interaction between purified elastase-2 and various concentrations of glycosaminoglycans.
- The effect of glycosaminoglycans on the formation of the elastase-2/alpha-1 peptidase inhibitor complex was analyzed.
Main Results:
- Glycosaminoglycans exhibit dual effects on elastase-2 activity: inhibition at low concentrations and activation at high concentrations.
- This concentration-dependent modulation is proposed to involve a mechanism with at least two GAG binding sites on the enzyme.
- Glycosaminoglycans interfere with the inhibition of elastase-2 by alpha-1 peptidase inhibitor, altering proteolytic activity.
Conclusions:
- Glycosaminoglycans play a critical role in regulating elastase-2 activity in the extracellular space.
- The concentration-dependent effects of GAGs on HLE activity and its inhibition suggest a finely-tuned control mechanism in ECM remodeling and degradation.
Related Concept Videos
01:23Role 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...
A...
02:34Enzymes
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
01:26Protein Modifications in the RER
Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
01:20Determinants of Bacterial Pathogenicity and Virulence
Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
01:30Enzyme 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.
01:28Gene Regulation in Microbial Communities: Quorum Sensing
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...