Synthetic Binding Protein Monobody Conjugation for Targeted Delivery
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Solution Overview
Problem
Current methods for targeted delivery of therapeutic, diagnostic, and prophylactic agents face challenges due to random orientation of targeting agents on particles and lack of adaptability, leading to poor targeting efficacy and increased toxicity.
Innovation Solution
The use of synthetic binding proteins, such as monobodies, with a targeting agent binding site and a cysteine moiety for conjugation to particles or nucleic acids, allowing for controlled and specific orientation of targeting agents, enabling targeted delivery without the need for re-engineering existing molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amine-coupling chemistries are used to conjugate targeting agents to particles, then the targeting agents can be attached to particles, but the orientation of targeting agents becomes random and the process becomes complex and time-consuming
Solution Approach 1:
The patent introduces a synthetic binding protein as an intermediary component that bridges the particle surface and the targeting agent. This mediator provides a controlled interface for conjugation, replacing the direct amine-coupling chemistry with a protein-based linkage system that enables both simplicity and precise orientation control
Solution Approach 2:
The conjugation system is divided into distinct functional segments: the synthetic binding protein conjugation domain for particle attachment, the synthetic binding protein binding domain for targeting agent attachment, and the linker region connecting these functions. This segmentation allows independent optimization of each interface while maintaining overall system simplicity and precision
2Reliability
If multiple centrifugation and tube exchange steps are used in the conjugation process, then the targeting agent can be coupled to the particle, but the process time and complexity increase significantly
Solution Approach 1:
The synthetic binding protein serves as a molecular intermediary that facilitates reliable conjugation through specific binding interactions, eliminating the need for multiple purification steps. The mediator's designed binding interface ensures complete coupling in a single step, reducing both time and procedural complexity while maintaining high reliability
Solution Approach 2:
The conjugation system is designed to be self-regulating, where the synthetic binding protein automatically positions and secures the targeting agent through its inherent binding affinity. This self-service mechanism eliminates the need for external intervention through multiple centrifugation and exchange steps, achieving both reliability and time efficiency
3Reliability
If a large excess of targeting agent is used in the conjugation process, then the targeting agent can be successfully coupled to the particle, but the cost and adaptability of the process decrease
Solution Approach 1:
The synthetic binding protein acts as a stoichiometric mediator that enables 1:1 coupling between particles and targeting agents through its dual-binding capability. This eliminates the need for large excesses of targeting agent, reducing cost while maintaining high conjugation success rates. The mediator's specific binding interfaces provide consistent results across different experimental conditions, enhancing process adaptability
4Ease of manufacture
If random orientation of targeting agents is accepted, then the conjugation process is simpler, but the targeting efficacy is compromised
Solution Approach 1:
The synthetic binding protein introduces asymmetric structural features that dictate a specific orientation for targeting agent attachment. The non-symmetric arrangement of binding domains and linkers ensures that the targeting agent is positioned in the correct orientation relative to the particle surface, maintaining conjugation simplicity while achieving high targeting efficacy through structural asymmetry
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
This approach enhances the spatial orientation of targeting agents, improving recognition and binding efficacy, reducing off-target toxicity, and facilitating controlled release of therapeutic agents in a site-specific manner.
Implementation Method 1
The synthetic binding protein can contain a first surface containing a targeting agent binding site and a second surface containing a cysteine, through which the synthetic binding protein is conjugated to the particle's surface
Data Source
AI summary
A platform technology provides particle and nucleic acid conjugates, and compositions thereof, with enhanced targeting to cells, tissues, organs. The particles and nucleic acids and other deliverables contain a synthetic binding protein such as a polypeptide monobody covalently conjugated to the surface of the particle or the nucleic acid, for linking a targeting agent to the particle's surface or the nucleic acid. The particles and nucleic acids and other deliverables optionally contain an antibody non-covalently conjugated to the binding protein, via an Fc domain of the antibody. The particles can include therapeutic agents, diagnostic agents, prophylactic agents, or a combination thereof, to be delivered to desired cells, tissues, and/or organs. The particles and nucleic acids and other deliverables can be used in a wide array of applications including, but not limited to, ex vivo perfusion of mammalian organs and in vivo disease treatment.