Triazole Macrocycles via Click Chemistry for Peptide Stability
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Solution Overview
Problem
Unmodified peptides face challenges such as poor metabolic stability, cell penetrability, and conformational flexibility due to their flexibility, and existing methods to address these issues, like disulfide and amide bond formation, suffer from limitations like poor stability and the use of potentially toxic metals.
Innovation Solution
The development of peptidomimetic macrocycles with specific structural features, including natural or non-natural amino acids and macrocycle-forming linkers, which enhance conformational rigidity, metabolic stability, and cell penetrability, using methods like macrocyclization with Cu or Ru reagents to form covalent linkages between azide and alkyne moieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unmodified peptides are used, then they maintain natural flexibility and bioactivity, but they suffer from poor metabolic stability and poor cell penetrability
Solution Approach 1:
The peptide is divided into segments that are connected through a macrocycle structure, creating a cyclic peptide framework that maintains flexibility while improving stability and penetrability
Solution Approach 2:
The invention combines natural amino acid residues with non-natural amino acid residues containing azide or alkyne groups to form a composite peptidomimetic macrocycle that exhibits both metabolic stability and cell penetrability
2Stability of the object's composition
If disulfide bond formation is used to improve stability, then conformational rigidity increases, but metabolic stability remains poor and cell penetrability is limited
Solution Approach 1:
The invention changes the chemical parameters of the peptide by incorporating non-natural amino acids with azide or alkyne groups, enabling macrocyclization that provides both conformational rigidity and metabolic stability simultaneously
3Stability of the object's composition
If carbon-carbon bond formation is used to create cyclic structures, then conformational rigidity increases, but potentially toxic metals are required
Solution Approach 1:
The invention uses click chemistry as an intermediary reaction mechanism that forms carbon-carbon bonds through copper-catalyzed azide-alkyne cycloaddition, providing conformational rigidity while using biocompatible copper catalysts that can be removed
Solution Approach 2:
The invention replaces traditional metal-based coupling methods with click chemistry, substituting a potentially toxic metal-catalyzed process with a biocompatible copper-catalyzed reaction that produces stable triazole linkages
4Stability of the object's composition
If amide bond formation is used to improve stability, then conformational rigidity increases, but metabolic stability remains poor and cell penetrability is limited
Solution Approach 1:
The peptide backbone is segmented and reconnected through macrocyclization, creating a cyclic structure that prevents proteolytic degradation while maintaining the essential conformational rigidity needed for stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The peptidomimetic macrocycles exhibit increased stability, thermal stability, and biological activity, with enhanced ability to penetrate cells compared to non-macrocyclic polypeptides, and can form stable α-helical structures in aqueous solutions.
Implementation Method 1
contacting a peptidomimetic precursor with a macrocyclization reagent, wherein the contacting step results in a covalent linkage being formed between the azide and alkyne moiety
Data Source
AI summary
The present invention provides novel peptidomimetic macrocycles and methods for their preparation and use, as well as amino acid analogs and macrocycle-forming linkers, and kits useful in their production.