Dual-Stimulus PROTAC Activation for Selective Protein Degradation
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Solution Overview
Problem
Existing targeted protein degraders like PROTACs face challenges in achieving selective protein degradation while minimizing off-target effects, particularly in tumor treatments, and single-stimulus pro-PROTACs can cause unintended toxicity.
Innovation Solution
Development of dual-stimulus responsive proteolysis targeting chimeras (PROTACs) that require both stimuli to activate protein degradation, preventing recruitment in the absence of either stimulus, and utilizing a target binding moiety, linker moiety, and ubiquitin ligase-recruiting moiety with first and second stimulus-reactive moieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-stimulus pro-PROTACs are used to enable prodrug-based strategies, then promise of selective activation is achieved, but unintended toxicity occurs due to insufficient selectivity
Solution Approach 1:
The pro-PROTAC molecule is segmented into two distinct stimulus-reactive moieties (first stimulus-reactive moiety and second stimulus-reactive moiety) that must both be activated for the PROTAC to become functional. This segmentation ensures that neither stimulus alone can trigger off-target effects, as both conditions must be simultaneously met for activation.
Solution Approach 2:
The PROTAC is designed in an inactive precursor form (pro-PROTAC) that requires preliminary activation by two specific stimuli before becoming functional. This preliminary action ensures that the active compound is only generated when both stimulus conditions are satisfied, preventing premature or unintended activation in off-target tissues.
2Productivity
If conventional PROTACs are used to degrade target proteins, then protein degradation capability is achieved, but off-target effects increase due to lack of conditional activation
Solution Approach 1:
The PROTAC exhibits different functional qualities in different local conditions: it remains inactive in tissues where either stimulus is absent, and becomes active only in the specific local environment where both stimuli are present (e.g., tumor microenvironment). This local quality differentiation enables selective protein degradation at the target site while sparing off-target tissues.
Solution Approach 2:
The activation state of the PROTAC changes based on the presence or absence of specific stimulus parameters. The molecule transitions from an inactive state (when either stimulus is absent) to an active state (when both stimuli are present), allowing controlled protein degradation only under the desired parametric conditions.
3Reliability
If dual-stimulus responsive PROTACs are developed to enhance specificity, then off-target effects are reduced, but device complexity increases due to multiple stimulus-reactive moieties
Solution Approach 1:
The dual-stimulus responsive moieties are integrated into a single PROTAC molecule that maintains the core functions of target binding and ubiquitin ligase recruitment. The additional stimulus-reactive components serve multiple purposes: they provide conditional activation control and can be designed to respond to biologically relevant stimuli, thus adding functionality without proportionally increasing complexity.
Data Source
AI summary
A proteolysis targeting chimera is provided of Formula I:wherein: T includes a target binding moiety capable of binding to a target protein; L includes a linker moiety; and U includes a ubiquitin ligase-recruiting moiety capable of binding a ubiquitin ligase; wherein any of T, L, or U further includes a first stimulus-reactive moiety S1, wherein S1 is reactive to a first stimulus; and wherein any of T, L, or U further includes a second stimulus-reactive moiety S2, wherein S2 is reactive to a second stimulus, wherein the second stimulus is different than the first stimulus.