Small-Molecule Inhibition of the UNC-Src Interaction Impairs Dynamic Src Localization in Cells

Area of Science:

• Oncology
• Molecular Biology
• Drug Discovery

Background:

• Src signaling is crucial for cancer progression, but ATP-competitive inhibitors face clinical challenges.
• UNC119 proteins regulate Src localization and activity at the plasma membrane, representing an alternative therapeutic target.
• Targeting the UNC119-Src interaction offers a novel strategy for anti-cancer drug development.

Purpose of the Study:

• To discover and characterize a novel inhibitor of the UNC119-Src interaction.
• To investigate the effects of UNC119 inhibition on Src localization and activity.
• To evaluate the anti-cancer potential of UNC119 inhibition in colorectal cancer models.

Main Methods:

• Discovery of a small molecule inhibitor targeting the UNC119-Src protein-protein interaction.
• Cellular assays to assess inhibitor binding to UNC119 and Src redistribution.
• Measurement of Src autophosphorylation at Y419.
• Assessment of cell growth and clonogenic potential in colorectal cancer cells.

Main Results:

• A potent and specific inhibitor of the UNC119-Src interaction with a novel chemotype was identified.
• The inhibitor binds UNC119 in cells, leading to Src redistribution to endomembranes.
• Inhibition of UNC119 reduced activating Src autophosphorylation on Y419.
• UNC119 inhibition specifically decreased cell growth and clonogenic potential in Src-dependent colorectal cancer cells.

Conclusions:

• Small-molecule inhibition of the UNC119-Src interaction is a viable strategy to impair oncogenic Src signaling.
• Interfering with Src spatial cycle dynamics offers a promising avenue for anti-cancer drug discovery.
• This approach provides an alternative to traditional ATP-competitive Src inhibitors.