PROTAC Compounds Targeting Coronavirus 3CL Protease

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Solution Overview

Problem

Current coronavirus 3CL protease inhibitors have limitations such as single structure types and limited pharmacodynamic pathways, which restrict their effectiveness in inhibiting the 3CL protease activity and degrading the 3CL protease protein.

Innovation Solution

Development of PROTACs (Proteolytic Targeting Chimera) compounds that target the 3CL protease, utilizing a linker structure and specific synthetic building blocks to inhibit and degrade the 3CL protease through the ubiquitin-proteasome system, with a method that avoids high temperature and toxic reagents, enabling high atom economy and industrial scalability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional 3CL protease inhibitors are used, then the protease activity is inhibited, but the pharmacodynamic pathway is limited and structural diversity is restricted

Engineering Contradiction:

Improveinhibitory effectVSAvoidpharmacodynamic pathway

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The PROTAC molecule is segmented into three functional modules: a 3CL protease binder (nirmatrelvir or similar compounds), a linker component, and an E3 ubiquitin ligase recruiter (such as VHL or CRBN ligands). This segmentation allows each module to perform its specific function independently while working together to achieve both inhibition and degradation of the target protease, thereby expanding the pharmacodynamic pathway beyond simple inhibition.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If PROTAC compounds are developed to expand pharmacodynamic pathways, then the versatility against 3CL protease is improved, but the structural complexity increases

Engineering Contradiction:

Improvepharmacodynamic pathwayVSAvoidmolecular structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The linker serves as an intermediary component that connects the 3CL protease binder and the E3 ubiquitin ligase recruiter. By using well-established linker chemistries (such as PEG linkers, alkyl chains, or aromatic linkers), the molecular complexity is managed systematically while still achieving the desired dual functionality. The linker acts as a flexible bridge that allows optimal spatial arrangement of the two binding domains without requiring complete redesign of the entire molecular architecture.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If complex PROTAC synthesis is performed, then the desired degradation activity is achieved, but the manufacturing cost and environmental impact increase

Engineering Contradiction:

Improvedegradation activityVSAvoidsynthesis process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The synthesis is segmented into modular stages: first synthesizing the 3CL protease binder component, then the E3 ligase recruiter component, and finally coupling them through the linker. This modular approach allows each component to be optimized and synthesized using established methodologies, reducing the need for complex multi-step synthesis routes. Intermediate products can be purified and characterized at each stage, simplifying quality control and scale-up processes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention employs parameter optimization in the synthesis process, including selecting mild reaction conditions, optimizing solvent systems, and adjusting coupling reagents to maximize yield while minimizing waste. By carefully controlling reaction parameters such as temperature, pH, and reaction time, the synthesis achieves high degradation activity without requiring excessively complex or environmentally damaging conditions.

Inventive Principle:

Principle #35Parameter changes

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

The synthesized compounds demonstrate strong inhibitory and degrading activities against 3CL protease with IC50 and DC50 values below 100 nM, overcoming the limitations of existing inhibitors by providing a multi-faceted approach to targeting the 3CL protease.

Implementation Method 1

Proteolytic targeted chimera (PROTAC) is a technique for chemically degrading proteins. It can bind the target protein and E3 ubiquitin ligase at the same time, make the target protein close to E3 ubiquitin ligase

Methodology Applied

Scientific EffectProtein-protein interaction: