Related Experiment Videos
A semicontinuous, high-performance liquid chromatography-based assay for stromelysin
R Harrison1, J Teahan, R Stein
1Department of Enzymology, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065.
Analytical Biochemistry
|July 1, 1989
Summary
Human fibroblast stromelysin cleaves substance P at the Gln6-Phe7 bond. A new HPLC assay quantifies this hydrolysis, revealing Michaelis-Menten kinetics for substrate P cleavage.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Metalloendoproteinases, such as human fibroblast stromelysin, play roles in extracellular matrix remodeling.
- Identifying specific peptide substrates is crucial for understanding enzyme function and developing assays.
Purpose of the Study:
- To identify low molecular weight peptide substrates for human fibroblast stromelysin.
- To develop a quantitative assay for stromelysin activity using substance P.
Main Methods:
- Substance P was incubated with human fibroblast stromelysin.
- Product formation was monitored using a semi-continuous High-Performance Liquid Chromatography (HPLC) assay.
- Kinetic parameters (Vmax, Km) were determined using Michaelis-Menten kinetics.
Main Results:
- Substance P was identified as a substrate for human fibroblast stromelysin.
- Cleavage occurred exclusively at the Gln6-Phe7 bond.
- The HPLC assay demonstrated Michaelis-Menten kinetics with Vmax = (2.4 nmol SP7-11/min)/µg protein and Km = 0.38 mM.
Conclusions:
- Substance P is a specific substrate for human fibroblast stromelysin.
- A robust HPLC-based assay was developed for measuring stromelysin activity.
- The kinetic data provide insights into the enzyme-substrate interaction.