Ring-Constrained Amino Acid Surrogates for Peptide Stability
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Solution Overview
Problem
Current peptide mimetics and natriuretic peptide systems face challenges in maintaining stability, bioavailability, and receptor binding affinity, particularly in the context of natriuretic peptides like ANP, which are prone to enzymatic degradation and have short circulation half-lives.
Innovation Solution
Development of ring-constrained amino acid surrogates that can be incorporated into peptide constructs, enhancing stability, bioavailability, and receptor binding affinity by substituting amino acid residues with specific surrogates that form non-peptide bonds and cyclic structures, thereby mimicking natural peptides more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peptide mimetics are designed to fix critical function domains in restricted configurations, then receptor binding affinity is improved, but enzymatic degradation resistance is worsened
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of amino acid residues through ring constraints and non-peptide bonds. Specifically, it uses ring-constrained amino acid surrogates with restricted torsion angles and non-hydrolyzable non-peptide bonds to change the structural parameters of the peptide backbone, thereby improving both stability and binding affinity simultaneously
Solution Approach 2:
The patent employs composite materials by combining ring-constrained amino acid surrogates with non-peptide bond linkages to create hybrid structures. These composite structures integrate the stability benefits of non-peptide bonds with the conformational restriction advantages of ring constraints, resolving the contradiction between binding affinity and degradation resistance
2Adaptability or versatility
If peptide flexibility is maintained for biological activity, then adaptability is improved, but circulation half-life is worsened
Solution Approach 1:
The patent applies local quality by implementing ring constraints at specific positions within the peptide sequence rather than throughout the entire structure. This allows localized conformational restriction to maintain stability and half-life while preserving flexibility and biological activity in other regions of the molecule
Solution Approach 2:
The patent uses dynamics by designing ring-constrained amino acid surrogates that maintain controlled flexibility through defined torsion angles. The ring constraints provide structural stability for extended circulation half-life while allowing sufficient conformational freedom to maintain biological activity and adaptability
3Duration of action of stationary object
If ring constraints are introduced to stabilize peptide conformation, then circulation half-life is improved, but structural complexity is worsened
Solution Approach 1:
The patent applies segmentation by dividing the peptide structure into discrete ring-constrained amino acid surrogate units that can be incorporated into the peptide sequence. This modular approach allows systematic stabilization of critical conformational domains while maintaining overall structural manageability and reducing synthesis complexity
Data Source
AI summary
Ring-constrained amino acid surrogates of formula (I) where R1, R2, R3, R4, R5, R6a, R6b, R7, and y are as defined in the specification, methods for synthesizing ring-constrained amino acid surrogates of formula (I), methods of use of ring-constrained amino acid surrogates of formula I, including use in linear or cyclic compounds which include a plurality of amino acid residues and one or more ring-constrained amino acid surrogates of formula I and linear or cyclic compounds which include a plurality of amino acid residues and one or more ring-constrained amino acid surrogates of formula I.