Context matters in PROTAC design: navigating the trade-off between degradation and developability
Boxin Zhang1,2, Yunfei Zhang1,2, Bingxing Zhang1,2
1School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, China.
Journal of Enzyme Inhibition and Medicinal Chemistry
|August 4, 2026
Summary
Designing Proteolysis-targeting chimeras (PROTACs) requires optimizing degradation and developability. This review presents a framework for PROTAC design, considering medicinal chemistry context, ternary complex formation, and biological constraints for therapeutic success.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Drug Discovery
Background:
- Proteolysis-targeting chimeras (PROTACs) offer a novel therapeutic modality by inducing target protein degradation.
- Optimizing PROTACs involves balancing degradation efficiency with drug-like properties (developability).
Purpose of the Study:
- To reframe PROTAC design as a context-dependent medicinal chemistry challenge.
- To provide an integrated framework for rational PROTAC design.
Main Methods:
- Analysis of structure-activity relationships concerning linker properties and warhead recognition.
- Evaluation of biological constraints imposed by E3 ligase selection and conditional activation strategies.
Main Results:
- PROTAC design is influenced by linker characteristics, warhead binding, and ternary complex formation.
- Physicochemical properties (beyond Rule of Five) are critical for cellular exposure.
- E3 ligase choice introduces biological complexities including expression, localization, and safety.
Conclusions:
- A holistic framework integrating ternary complex formation, drug exposure, and biological context is essential for effective PROTAC design.
- This approach moves beyond modular assembly to a context-dependent medicinal chemistry strategy.
Related Concept Videos
01:22Design Consideration
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key aspect...
The factor of safety is another key aspect...
01:24Concepts and Prototypes
The human nervous system handles vast amounts of information by translating sensory stimuli into neural impulses, which the brain processes, creating thoughts expressed through language or stored as memories. The brain also synthesizes information from emotions and memories, which significantly influence thoughts and behaviors. This intricate process creates a comprehensive mental picture.
The brain organizes this information using concepts, which are mental categories grouping linguistic data,...
The brain organizes this information using concepts, which are mental categories grouping linguistic data,...
01:14Design Example: Managing Concrete Workability
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
To address...
To address...
01:24Factors Affecting Workability
The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
01:26PD Controller: Design
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
01:23Design Example
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...