Medium-Sized Peptide Cyclization for Permeability and Stability
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Solution Overview
Problem
Existing methods for cyclizing peptides to enhance membrane permeability and metabolic stability are limited, particularly for medium-sized peptides, leading to challenges in creating structurally diverse and drug-like compounds suitable for drug discovery against tough targets.
Innovation Solution
A novel method for cyclizing peptides through translation and post-translational chemical modification, including the formation of amide or carbon-carbon bonds between reactive sites, and the use of active ester groups and reaction promoting groups to create structurally diverse cyclic peptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional cyclization methods are used for medium-sized peptides, then structural diversity is limited, but the complexity of chemical synthesis increases
Solution Approach 1:
The invention divides the peptide synthesis process into two independent stages: (1) combinatorial chemical synthesis of diverse peptide libraries with predetermined cyclization capabilities, and (2) selective cyclization of desired peptides. This segmentation allows structural diversity to be generated in the first stage without increasing the complexity of subsequent cyclization steps, as the peptides are pre-designed with built-in cyclization moieties.
Solution Approach 2:
The invention incorporates cyclization capabilities during the initial combinatorial synthesis stage by including specific amino acid residues (such as cysteine, lysine, or aspartic acid) at predetermined positions in the peptide sequence. This preliminary action ensures that when the peptide is synthesized, it already contains the necessary functional groups for cyclization, eliminating the need for complex post-synthesis modifications and reducing overall synthesis complexity.
2Object-affected harmful factors
If medium-sized peptides are designed for tough targets, then membrane permeability improves, but metabolic stability decreases
Solution Approach 1:
The invention systematically varies key parameters of the peptide structure including molecular weight (500-2000 Da), hydrophobicity (logP values), and cyclization motif types to optimize the balance between membrane permeability and metabolic stability. By changing these parameters across a library of peptides, the invention identifies optimal configurations that achieve both improved membrane permeability for cellular uptake and enhanced metabolic stability through cyclic structure formation.
Solution Approach 2:
The invention creates composite peptide structures that combine hydrophobic regions (for membrane permeability) with cyclic motifs (for metabolic stability). The cyclic structures formed through disulfide bridges, amide bonds, or other linkages create rigid, stable frameworks that resist enzymatic degradation, while strategically placed hydrophobic amino acid residues enable membrane penetration. This composite design approach allows simultaneous optimization of both properties.
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 method enables the synthesis of drug-like peptides with improved membrane permeability and metabolic stability, facilitating the development of clinically effective compounds with enhanced drug efficacy.
Implementation Method 1
translationally synthesizing a noncyclic peptide compound composed of amino acid residues and/or amino acid analog residues from a nucleic acid sequence encoding the peptide compound
Implementation Method 2
forming an amide bond or a carbon-carbon bond between the reactive site of the amino acid residue, amino acid analog residue or the N-terminal carboxylic acid analog on the N-terminal side and reactive site of the amino acid residue or amino acid analog residue on the C-terminal side
Data Source
AI summary
An object of the present invention is to provide methods of discovering drugs effective for tough targets, which have conventionally been discovered only with difficulty. The present invention relates to novel methods for cyclizing peptide compounds, and novel peptide compounds and libraries comprising the same, to achieve the above object.