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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
Published on: December 12, 2017
Refining the eosinophil cationic protein antibacterial pharmacophore by rational structure minimization
Marc Torrent1, David Pulido, Beatriz G de la Torre
1Department of Biochemistry and Molecular Biology, Universitat Autònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain.
Journal of Medicinal Chemistry
|June 24, 2011
Summary
Researchers identified the minimal antimicrobial domain of eosinophil cationic protein (ECP). Smaller analogues retain broad-spectrum activity and key functions, suggesting a simplified structure for potent antimicrobial agents.
Area of Science:
- Biochemistry
- Microbiology
- Structural Biology
Background:
- Eosinophil cationic protein (ECP) possesses broad antimicrobial activity.
- ECP is a ribonuclease with potential therapeutic applications.
Purpose of the Study:
- To identify the minimal antimicrobial domain of ECP.
- To define the structural requirements for ECP's antimicrobial activity.
Main Methods:
- Sequence analysis to identify the antimicrobial domain.
- Structure-based downsizing to create smaller analogues.
- Antimicrobial assays against Gram-negative and Gram-positive bacteria.
- Nuclear Magnetic Resonance (NMR) spectroscopy to assess structure.
Main Results:
- Residues 1-45 constitute the antimicrobial domain of ECP.
- Analogues ECP(8-36) and ECP(6-17)-Ahx-(23-36) show significant size reduction (36% and 40%) with retained potency.
- These analogues mimic ECP's antimicrobial profile, self-aggregation, lipopolysaccharide binding, and bacterial agglutination.
- Analogue (6-17)-Ahx-(23-36) preserves helical structures and bacterial agglutination ability.
Conclusions:
- The minimal antimicrobial structure of ECP has been defined.
- Downsized analogues retain significant antimicrobial activity and functional properties.
- The analogue ECP(6-17)-Ahx-(23-36) represents a minimal structure capable of reproducing ECP's activity.