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Published on: April 25, 2020
In Situ Photoregulation of Carbonic Anhydrase Activity Using Azobenzenesulfonamides
Kanchan Aggarwal1, Mandira Banik1, Brenda Medellin2
1Department of Chemistry , The University of Texas at Austin , 105 East 24th Street, Stop A5300 , Austin , Texas 78712 , United States.
Researchers developed novel azobenzenesulfonamide probes (CAP1 and CAP2) to control carbonic anhydrase (CA) activity using light. These probes reversibly inhibit or activate the enzyme, offering precise control over biological processes.
Area of Science:
- Biochemistry
- Chemical Biology
- Enzyme Kinetics
Background:
- Carbonic anhydrase (CA) plays crucial roles in various physiological processes.
- Controlling CA activity with precision is essential for understanding its functions and developing therapeutic strategies.
- Existing methods for modulating enzyme activity often lack spatiotemporal control.
Purpose of the Study:
- To develop novel small molecule probes for light-inducible modulation of carbonic anhydrase activity.
- To investigate the mechanism of probe-mediated enzyme inhibition and activation.
- To demonstrate the application of these probes in regulating enzyme activity in vitro and in live cells.
Main Methods:
- Synthesis and characterization of azobenzenesulfonamide probes (CAP1 and CAP2).
- Enzyme inhibition assays using purified carbonic anhydrase.
- Photochemical studies to investigate probe isomerization and activity modulation.
- Cell-based assays to assess intracellular pH regulation by CAP probes.
Main Results:
- CAP1 and CAP2 probes effectively inhibit CA activity in their trans isomeric form by occupying the active site.
- Photoirradiation induces isomerization to the cis form, leading to probe release and enzyme activity restoration.
- The probes can be repeatedly switched between active and inactive states without photodegradation.
- CAP1 isomers demonstrated differential regulation of intracellular cytosolic pH in live cells.
Conclusions:
- Azobenzenesulfonamide probes provide a light-controlled mechanism for reversible modulation of carbonic anhydrase activity.
- These probes offer spatiotemporal control over enzyme function, applicable in cell-free systems and live cells.
- The developed probes represent a valuable tool for studying carbonic anhydrase in biological systems and for potential therapeutic applications.
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