Development of small cyclic peptides targeting the CK2α/β interface.

Area of Science:

• Biochemistry
• Chemical Biology
• Structural Biology

Background:

• Protein-protein interactions (PPIs) are crucial in cellular signaling.
• CK2α/β is a key kinase involved in various cellular processes.
• Targeting PPIs with chemical probes offers therapeutic potential.

Purpose of the Study:

• To develop a functionalisable chemical probe for the CK2α/β PPI.
• To identify and optimize a lead compound with desirable drug-like properties.

Main Methods:

• Iterative application of enzymatic assays, X-ray crystallography, and molecular modeling.
• Cellular assays to validate probe function.
• Peptide synthesis and stability assessments.

Main Results:

• A lead peptide, P8C9, was identified as a CK2α/β PPI inhibitor.
• P8C9 demonstrates successful binding to CK2α at the PPI site.
• The probe is highly stable in serum and amenable to further functionalization and optimization.

Conclusions:

• P8C9 represents a promising chemical probe for studying CK2α/β PPIs.
• The developed probe has potential for further therapeutic development.
• The iterative methodology provides a robust framework for chemical probe discovery.