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Squash inhibitors: from structural motifs to macrocyclic knottins
Laurent Chiche1, Annie Heitz, Jean-Christophe Gelly
1Centre de Biochimie Structurale, CNRS UMR5048, INSERM UMR554, Université Montpellier I, Faculté de Pharmacie, 34093 Montpellier, France. chiche@cbs.cnrs.fr
Current Protein & Peptide Science
|November 24, 2004
Summary
This review discusses macrocyclic squash inhibitors, a type of knottin protein. These circular peptides, like MCoTI-I and MCoTI-II, possess unique structures with potential applications.
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- Squash inhibitors are potent serine proteinase inhibitors from Cucurbitaceae plants.
- Knottins are a protein family characterized by a conserved 'knottin fold' with three disulfide bridges.
- While most knottins are linear, MCoTI-I and MCoTI-II are novel macrocyclic squash inhibitors.
Purpose of the Study:
- To review the isolation, characterization, synthesis, and activity of macrocyclic knottins.
- To compare the structure of MCoTI-II with related knottins and cyclotides.
- To discuss potential applications of these macrocyclic scaffolds.
Main Methods:
- Isolation and characterization of macrocyclic squash inhibitors.
- Chemical synthesis of macrocyclic knottins.
- Solution structure determination (e.g., MCoTI-II).
- Comparative structural analysis.
Main Results:
- Identification and characterization of macrocyclic squash inhibitors (MCoTI-I, MCoTI-II).
- Demonstration of a cyclic structure formed by a peptide linker in these inhibitors.
- Structural comparison revealing similarities and differences with linear knottins and cyclotides.
Conclusions:
- Macrocyclic knottins represent a distinct subclass of squash inhibitors.
- Their unique cyclic structure offers new possibilities for protein engineering.
- These compounds hold promise for various biotechnological and therapeutic applications.