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Allosteric Site Inhibitor Disrupting Auto-Processing of Malarial Cysteine Proteases
A Pant1,2, R Kumar3, N A Wani4
1ICMR-National Institute of Malaria Research, Dwarka Sector 8, New Delhi, India.
Scientific Reports
|November 3, 2018
Summary
New compounds block falcipain activity in malaria parasites by targeting an allosteric site. This novel approach inhibits parasite growth and offers a promising strategy against drug resistance.
Area of Science:
- Biochemistry
- Parasitology
- Medicinal Chemistry
Background:
- Falcipains are essential haemoglobinases for Plasmodium falciparum growth.
- Current inhibitors target the active site, but allosteric inhibitors are uncharacterized.
- Falcipain auto-processing involves domain interactions sensitive to acidic environments.
Purpose of the Study:
- To design and synthesize novel allosteric inhibitors of falcipains.
- To investigate the mechanism of action for these inhibitors.
- To explore new strategies for antimalarial drug development.
Main Methods:
- Synthesis of six azapeptide compounds.
- Assay of parasite growth inhibition.
- Analysis of falcipain auto-processing and enzyme kinetics.
- Biochemical characterization of inhibitor-enzyme interactions.
Main Results:
- Compounds NA-01 and NA-03 effectively arrested parasite growth.
- These inhibitors specifically blocked falcipain auto-processing.
- NA-03 demonstrated high affinity for the prodomain-bound enzyme, inducing rigidity and preventing activation.
- Histidine-dependent activation of falcipain was observed.
Conclusions:
- A novel framework for targeting the allosteric site of falcipains was established.
- Allosteric inhibition offers a promising strategy for developing selective antimalarial drugs with reduced resistance potential.
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