Multi-arm Cyclic Peptide Capture Agents for CHIKV E2 Protein
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Solution Overview
Problem
Current methods for detecting and treating Chikungunya virus (CHIKV) infections lack effective diagnostic and therapeutic agents, with no approved antivirals or vaccines available, and existing detection agents are not cyclic peptide-based, limiting their effectiveness and specificity.
Innovation Solution
Development of cyclic peptide-based capture agents, specifically four unique peptide sequences (WIYYI, YWHWS, IYLRY, FWQIL) functionalized with azide groups, which form multi-arm constructs for enhanced affinity and selectivity to the CHIKV E2 protein, enabling improved detection and potential therapeutic applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection agents are used for CHIKV, then detection capability is provided, but affinity and selectivity are insufficient
Solution Approach 1:
The capture agent is segmented into multiple independent peptide arms (e.g., three-arm construct) that can independently bind to the target protein. This segmentation allows each arm to contribute to binding affinity while the collective structure enhances selectivity, resolving the contradiction between affinity and selectivity requirements.
Solution Approach 2:
The invention uses composite peptide structures combining multiple amino acid sequences (e.g., WIYYI, YWHWS, IYLRY, FWQIL) into a single multi-arm construct. This composite approach creates a capture agent with both high affinity (through multiple binding sites) and high selectivity (through coordinated epitope recognition), overcoming the limitations of conventional single-structure detection agents.
2Reliability
If multi-arm constructs are developed to improve affinity, then binding strength increases, but device complexity increases
Solution Approach 1:
The complex multi-arm construct is segmented into modular peptide units that can be independently synthesized and then assembled. This modular segmentation simplifies the development process despite the final complex structure, as each arm can be optimized separately before combination, reducing overall development complexity while maintaining high affinity.
3Measurement precision
If cyclic peptide library screening is performed to find specific binders, then selectivity improves, but time and resource consumption increase
Solution Approach 1:
The cyclic peptide library is pre-synthesized with diverse sequences before screening against the target protein. This preliminary preparation of the library allows for rapid screening once the target is introduced, reducing the overall time required compared to de novo synthesis during the screening process, while still achieving high selectivity through the pre-diversified library.
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 multi-arm constructs demonstrate over two orders of magnitude affinity improvement and enhanced selectivity for the CHIKV E2 protein, outperforming commercial antibodies and maintaining binding activity under thermal stress, facilitating effective detection and potential therapeutic interventions.
Implementation Method 1
an azide-functionalized cyclic peptide library for the screening process
Implementation Method 2
3-arm constructs resulted in over 2 orders of magnitude affinity improvement
Data Source
AI summary
A method for developing capture agents for target proteins employs a compound library to find cyclic peptide sequences that bind the target protein. The target protein is also reacted with a clickable group-provider reagent to provide the protein with clickable groups. The compounds in the library are provided with complementary clickable groups that bind the clickable group on the target protein when the peptide sequences bind the target protein. In some embodiments, the cyclic peptide sequences that bind the target protein are incorporated into constructs having one or more arms that can serve as capture agents or potential treatments against the pathogens from which the target protein is derived. Some embodiments provide pharmaceutical compositions for immunoassays, diagnostics, therapeutics or the like, that employ the constructs.