Template-fixed beta-hairpin peptidomimetics for CXCR4 antagonism
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Solution Overview
Problem
Current CXCR4 inhibitors face challenges such as cytotoxicity, low selectivity, and short half-life, which limit their clinical application, particularly in treating HIV and cancer, and they do not effectively block viral entry or cancer cell migration.
Innovation Solution
Development of β-hairpin peptidomimetics with a template-fixed backbone that stabilizes the β-hairpin conformation, using combinatorial synthesis to create libraries with enhanced CXCR4 antagonizing activity and reduced hemolysis and cytotoxicity, allowing for improved bioavailability and prolonged action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CXCR4 inhibitors are used to block viral entry and cancer cell migration, then therapeutic efficacy is improved, but cytotoxicity and hemolysis increase
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of CXCR4 inhibitors through template-fixed β-hairpin peptidomimetics. Specific structural parameters such as the backbone conformation (β-hairpin), chain lengths (4-6 and 5-7 residues), and amino acid composition (Gly, Pro, and specific types) are optimized to achieve high CXCR4 antagonizing activity while reducing cytotoxicity and hemolysis. This structural parameter optimization resolves the contradiction between efficacy and toxicity.
Solution Approach 2:
The invention uses composite materials by creating peptidomimetics that combine template-fixed structures with specific amino acid sequences. The composite nature of these molecules - integrating rigid templates with flexible peptide chains - allows simultaneous achievement of high receptor binding affinity (efficacy) and reduced off-target effects (lower cytotoxicity and hemolysis).
2Reliability
If CXCR4 inhibitors are designed with high antagonizing activity, then viral entry blocking is improved, but selectivity decreases leading to increased off-target effects
Solution Approach 1:
The patent applies local quality by creating regions of high structural organization within the peptidomimetics. The template-fixed β-hairpin structure provides a rigid, pre-organized local structure that specifically recognizes CXCR4, while other regions maintain flexibility. This local structural quality enhancement improves both binding affinity and selectivity, resolving the contradiction between efficacy and selectivity.
3Stability of the object's composition
If peptidomimetics are synthesized with complex template-fixed structures, then stability and half-life are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the peptidomimetic synthesis into modular steps using standard peptide coupling reactions. The template-fixed structure is built through sequential addition of amino acid residues (4-6 and 5-7 residues) using well-established solid-phase peptide synthesis methods. This segmented approach maintains structural stability while managing synthesis complexity through modular, repeatable steps.
Solution Approach 2:
The invention uses copying by employing standard, well-documented peptide synthesis protocols and building blocks. The template-fixed β-hairpin structure is replicated using established chemical synthesis methods, allowing complex structures to be manufactured through repeated application of standardized procedures, thereby reducing overall manufacturing complexity.
Data Source
AI summary
Template-fixed β-hairpin peptidomimetics of the General Formula (I); wherein Z1 and Z2 are template-fixed chains of 4 and 6 or 5 and 7 α-amino acid residues and salts thereof. They have CXCR4-antagonizing properties and can be used as medicaments. These β-sheet peptidomimetics can be manufactured by a process which is based on a mixed solid- and solution phase synthetic strategy.