The beta-D-glucose scaffold as a beta-turn mimetic

Area of Science:

• Medicinal Chemistry
• Drug Design
• Carbohydrate Chemistry

Background:

• Peptides offer potent binding and selectivity but often exhibit poor drug-like properties (ADMET) due to proteolysis and low bioavailability.
• Nonpeptidic scaffolds mimicking peptide turn motifs are crucial for developing more 'drugable' peptide-based therapeutics.
• Peptidic turn motifs are vital for molecular recognition, found on protein surfaces for interactions.

Purpose of the Study:

• To design and synthesize novel beta-turn mimetics using a beta-D-glucose scaffold.
• To investigate the potential of sugar scaffolds in mimicking critical peptide structural elements for drug development.
• To validate the use of beta-D-glucose as a scaffold for creating peptidomimetics with improved pharmacological profiles.

Main Methods:

• Design and synthesis of beta-D-glucose-based scaffolds capable of displaying amino acid side chains.
• Utilized facile etherification reactions for attaching side chains to the sugar scaffold.
• Employed biological assays and physical measurements to assess receptor binding and activity.

Main Results:

• Successfully synthesized beta-D-glucose mimetics that bind to somatostatin (SRIF) receptors.
• Identified specific analogs that act as agonists, demonstrating that the peptide backbone is not essential for receptor interaction.
• Discovered that these peptidomimetics exhibit pseudosymmetry, allowing for multiple binding modes and affinity for various receptors.

Conclusions:

• Beta-D-glucose scaffolds can effectively mimic peptidic beta-turns, offering a viable strategy for developing peptide-based drugs.
• The developed peptidomimetics demonstrate that nonpeptidic structures can achieve potent receptor binding and biological activity.
• Pseudosymmetry in monosaccharide scaffolds represents a privileged characteristic for drug discovery, enabling broad receptor targeting and lead generation.