Fragment Linking Strategies for Structure-Based Drug Design

Area of Science:

• Medicinal Chemistry
• Drug Discovery
• Computational Chemistry

Background:

• Fragment-based drug discovery (FBDD) is a key strategy for developing small-molecule inhibitors and drug candidates.
• The linking approach in FBDD theoretically offers rapid gains in binding energy but is underrepresented in clinical trials.
• Existing FBDD methods include growing, linking, and merging fragments.

Purpose of the Study:

• To provide a comprehensive review of the linking approach in FBDD.
• To analyze methods for identifying initial fragments (simultaneously or successively).
• To discuss linker design strategies for lead compound optimization.

Main Methods:

• Literature review of published FBDD linking strategies.
• Analysis of methods for simultaneous or successive fragment identification.
• Review of linker types and design principles.

Main Results:

• The linking approach, while theoretically potent, is not widely adopted in clinical drug development.
• Combining merging and linking methods, particularly by duplicating linkers from known inhibitors, shows promise.
• Fragment growth to minimize binder distance followed by linking with flexible linkers can achieve superadditivity.

Conclusions:

• The linking approach in FBDD warrants further investigation and application, especially in clinical settings.
• Optimizing linker design and fragment positioning is crucial for maximizing binding energy.
• A proposed strategy involves fragment growth and flexible linker application for enhanced lead compounds.