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Soluble apyrases release adp during ATP hydrolysis
1Department of Molecular and Cellular Biology, Harvard University, 7 Divinity Avenue, Cambridge, Massachusetts, 02138, USA.
Biochemical and Biophysical Research Communications
|March 27, 2001
Summary
Soluble CD39, an enzyme, was purified and characterized. It functions as a monomer, hydrolyzing ATP and releasing ADP as an intermediate, similar to potato apyrase.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- CD39 is an ectonucleotidase enzyme involved in purinergic signaling.
- Understanding the properties of soluble CD39 is crucial for its potential therapeutic applications.
Purpose of the Study:
- To express and purify a soluble form of CD39.
- To characterize the enzymatic activity and substrate specificity of soluble CD39.
- To investigate the nucleotide binding properties of soluble CD39.
Main Methods:
- Expression and purification of soluble CD39 from High-Five insect cells.
- Enzymatic assays to determine kinetic parameters (kcat, Km) for ATP and ADP hydrolysis.
- Characterization of nucleotide binding using Ca(2+) as a cofactor.
Main Results:
- Soluble CD39 was successfully expressed and purified as a monomer (54,000 MW).
- Kinetic analysis revealed specific catalytic rates and substrate affinities for ATP and ADP.
- A single nucleotide binding site was identified, dependent on Ca(2+).
- Soluble CD39 released ADP as an intermediate during ATP hydrolysis, unlike membrane-bound CD39.
Conclusions:
- The study provides a detailed biochemical characterization of soluble CD39.
- Soluble CD39 exhibits distinct enzymatic properties compared to its membrane-bound counterpart.
- The findings offer insights into the mechanism of ATP hydrolysis by CD39 and its potential role in biological systems.