Multifunctional PROTAC Conjugates for Diseased-Cell Targeting
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Solution Overview
Problem
Delivering PROTACs to diseased cells is challenging due to non-specific distribution during circulation, leading to off-target effects and decreased therapeutic efficacy, especially for proteins that are overexpressed or mutated inside cells.
Innovation Solution
Incorporating cellular targeting peptides into PROTAC molecules to guide therapeutics specifically to diseased cells, enhancing therapeutic index and reducing systemic toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PROTACs are used to target intracellular proteins, then protein degradation can be achieved, but non-specific distribution during circulation causes off-target effects and decreased therapeutic efficacy
Solution Approach 1:
The PROTAC molecule is segmented into distinct functional moieties: a cellular targeting moiety (A) that binds to specific receptors on diseased cells, a protein-targeting moiety (B) that binds to the intracellular target protein, and a ubiquitin ligase recruitment moiety (C) that recruits the E3 ligase. This segmentation allows each component to perform its specific function independently, improving specificity and reducing off-target effects while maintaining protein degradation capability.
Solution Approach 2:
Linking groups (L1, L2, L3) serve as intermediaries that connect the different moieties (A, B, C) to the central molecule (D). These linking groups facilitate the transfer of function from one moiety to another, enabling the cellular targeting moiety to guide the PROTAC to diseased cells while maintaining the protein-targeting and ubiquitin ligase recruitment capabilities through the central molecule.
2Reliability
If PROTACs are designed to target intracellular proteins, then therapeutic effectiveness can be improved, but delivery to diseased cells becomes more difficult due to non-specific distribution
Solution Approach 1:
The cellular targeting moiety (A) is designed to perform preliminary action by binding to specific receptors overexpressed on the surface of diseased cells before the PROTAC reaches the intracellular target. This preliminary binding guides the entire PROTAC structure to the correct cellular location, facilitating subsequent internalization and target engagement without requiring the PROTAC to navigate through non-specific distribution in the circulation.
3Reliability
If cellular targeting peptides are incorporated into PROTACs, then targeted delivery to diseased cells is enhanced, but molecular complexity increases
Solution Approach 1:
The central molecule (D) serves as a universal hub that performs multiple functions: it connects the cellular targeting moiety (A), the protein-targeting moiety (B), and the ubiquitin ligase recruitment moiety (C) through different linking groups. This multi-functional central molecule reduces the need for separate connection mechanisms, thereby managing molecular complexity while maintaining the ability to perform targeted delivery, protein binding, and E3 ligase recruitment simultaneously.
Data Source
AI summary
The present invention relates to various molecular constructs having at least one cellular-targeting element, one protein-targeting element, and one ubiquitin ligase recruitment element, wherein these elements are conjugated in a manner that facilitates cellular uptake and targeted degradation of specific proteins within cells. The present invention further relates to multifunctional proteolysis-targeting chimera conjugates and uses thereof for the treatment of diseases or disorders such as immune and inflammatory diseases, infectious diseases, cardiovascular diseases, endocrine disorders, and various cancers that are otherwise resistant to traditional therapeutic regimens.