Site-Selective Protein Labeling via Traceless Affinity Labels
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Solution Overview
Problem
Current methods lack effective site-selective and chemospecific labeling techniques for lysines in proteins, limiting the development of protein conjugates and antibody-drug conjugates, which are essential for various therapeutic and diagnostic applications.
Innovation Solution
The development of compounds comprising a peptide with an orthogonally-reactive moiety capable of forming a covalent attachment with amino groups of proteins, allowing for site-selective functionalization and subsequent attachment of payloads, using click chemistry reactions to introduce diverse entities such as imaging agents or drugs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional labeling methods are used for lysines in proteins, then labeling can be achieved, but site-selectivity and chemospecificity are insufficient
Solution Approach 1:
The patent employs an affinity label as an intermediary molecule that consists of three components: a binding group that recognizes and binds to a specific site on the protein, a linker that connects the binding group to the reactive group, and a reactive group that forms a covalent bond with the target lysine. This intermediary approach enables site-selective labeling by ensuring that the reactive group is only activated after specific binding to the target site, thereby achieving high manufacturing precision without requiring complex experimental procedures
Solution Approach 2:
The affinity label is segmented into distinct functional modules: a binding group (such as a peptide or small molecule that recognizes a specific protein site), a linker (such as a cleavable or non-cleavable spacer), and a reactive group (such as an electrophilic moiety that reacts with lysine). This segmentation allows each component to be optimized independently for its specific function, improving overall labeling precision while maintaining ease of manufacture through modular design
2Adaptability or versatility
If site-selective labeling of lysines is achieved, then diverse candidates for conjugate development are provided, but current methods lack effective techniques to accomplish this
Solution Approach 1:
The patent utilizes parameter changes in the form of different affinity labels with varying binding groups, linkers, and reactive groups to achieve site-selective labeling at different lysine residues. By changing the binding group specificity, linker length, or reactive group type, diverse conjugate candidates can be generated with different pharmacokinetic properties, thereby improving adaptability while maintaining reliability through the consistent use of affinity-driven selectivity
Solution Approach 2:
The affinity label performs preliminary site-specific binding to the protein before the actual covalent labeling occurs. This preliminary action ensures that the reactive group is positioned at the desired site and only becomes active after specific recognition, providing reliable site-selective labeling that generates diverse yet controlled conjugate candidates for further development
3Manufacturing precision
If molecular biology methods are used to modify proteins prior to payload attachment, then site-specific labeling can be achieved, but the process becomes labor intensive
Solution Approach 1:
The affinity label performs self-service by autonomously achieving site-specific labeling through its intrinsic binding group that recognizes the target protein site. No prior protein modification or molecular biology techniques are required—the affinity label itself provides the specificity and executes the labeling function, thereby maintaining high manufacturing precision while eliminating time-consuming preliminary steps
Solution Approach 2:
The patent extracts the site-specificity function from complex molecular biology methods and consolidates it into a single affinity label molecule. The binding group within the affinity label takes out the role of site recognition from elaborate genetic or biochemical procedures, enabling direct chemical labeling without labor-intensive protein engineering steps
4Manufacturing precision
If affinity labels are used for site-selective labeling, then the affinity group should be traceless (not appearing in the final product), but achieving complete tracelessness while maintaining binding affinity is challenging
Solution Approach 1:
The patent employs a cleavable linker that allows the affinity group to be discarded after it has served its purpose of guiding the reactive group to the target site. The cleavable linker (such as a disulfide bond or hydrolyzable ester) enables the affinity group to be removed from the final conjugate product, achieving tracelessness while the binding affinity is maintained during the labeling process through the intact affinity label structure
Solution Approach 2:
The affinity label is segmented into a binding group, a cleavable linker, and a reactive group. This segmentation allows the binding group to provide strong affinity for site-specific recognition, while the cleavable linker portion can be removed after labeling to achieve tracelessness. The modular design enables both high binding affinity during labeling and complete removal of the affinity group in the final product
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
Enables the site-selective modification of antibodies and proteins, enhancing their therapeutic and diagnostic efficacy by allowing precise attachment of payloads, improving pharmacokinetics and safety, and expanding their applications in treating diseases like cancer and autoimmune disorders.
Implementation Method 1
using click chemistry reactions to introduce diverse entities such as imaging agents or drugs
Data Source
AI summary
The present disclosure relates to site-selective labeling compounds, and methods of using such compounds.