Engineered Protease-Responsive Notch Receptors for Specific Signaling
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Solution Overview
Problem
Current methods for regulating protein function and gene activity, particularly in the context of Notch signaling, lack sophistication and specificity, especially in controlling diverse systems and addressing diseases with hyperactive Notch signaling.
Innovation Solution
Development of synthetic nucleic acids encoding mutant Notch NRRs with mutations that induce ligand-independent activation, combined with cleavable linkers and Notch NRR-binding antibodies, to create protease-regulatable Notch signaling modulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods for regulating protein function and gene activity are used, then basic control is achieved, but sophistication and specificity are lacking
Solution Approach 1:
The Notch receptor is segmented into distinct functional domains: an extracellular domain containing LNR modules for protease sensing, a transmembrane domain, and an intracellular domain with transcriptional activation capability. This segmentation allows independent optimization of sensing and signaling functions, achieving high specificity without overwhelming complexity
Solution Approach 2:
A protease-cleavable linker serves as an intermediary between the extracellular LNR domain and the intracellular signaling domain. This intermediary element transduces the proteolytic cleavage event into conformational changes that activate intracellular signaling, enabling specific detection of protease activity while maintaining manageable system complexity
2Ease of operation
If ligand-independent activation mutations are introduced, then control over Notch signaling is enhanced, but risk of aberrant signaling increases
Solution Approach 1:
The system incorporates preliminary regulatory elements including the LNR domain that must undergo specific proteolytic cleavage before activation can occur. This preliminary action serves as a safety checkpoint that prevents spurious activation while allowing controlled activation when the proper proteolytic signal is present
Solution Approach 2:
The system utilizes controlled parameter changes through protease-mediated cleavage of the linker region. This changes the conformational state and accessibility of the intracellular domain, enabling reliable activation only when specific proteolytic parameters are met, thus maintaining signaling fidelity while achieving operational control
3Adaptability or versatility
If synthetic receptors with customizable input-output relationships are developed, then therapeutic applications are expanded, but system complexity increases
Solution Approach 1:
The synthetic Notch receptor employs universal modular components: LNR domains that can recognize various protease cleavage patterns, standardized transmembrane anchors, and interchangeable intracellular signaling domains. This universality allows the same basic architecture to be applied across multiple therapeutic contexts, achieving versatility without proportional increases in complexity
Solution Approach 2:
Different regions of the receptor are optimized with local qualities appropriate to their function: the extracellular LNR domain is optimized for protease binding and cleavage resistance, the linker region for controlled cleavage and conformational change, and the intracellular domain for transcriptional activation. This local optimization allows versatile therapeutic applications while maintaining manageable overall complexity
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
Enhances the specificity and control of Notch signaling, providing therapeutic applications in diseases with aberrant proteolysis, such as cancer, by integrating customizable input-output relationships in synthetic signaling networks.
Implementation Method 1
a mutation that induces ligand-independent activation of regulated intramembrane proteolysis resulting to Notch signaling
Implementation Method 2
Upon the application of a pulling force, however, these LNR domains are displaced, and two concomitant proteolytic cleavages occur
Data Source
AI summary
Described herein are compositions, methods, and systems for modulating Notch receptor activation. Aspects of the invention relate to synthetic proteins comprising at least a mutant Notch NRR (Negative Regulatory Region). Another aspect of the invention relates to a protease-dependent synthetic protein. Engineered cells comprising the synthetic protein are additionally described herein.