Abstract
AbstractOne of the hallmarks of cancer is the overproduction of growth factors such as EGF. Despite the clinical success achieved by EGFR‐targeted therapies, their long‐term efficacy is compromised by the onset of drug‐resistant mutations. To address this issue, a family of camelid‐derived single‐domain antibodies (Nbs) were generated, obtaining the first direct EGF inhibitors that prevent EGFR phosphorylation and pathway activation through this new mechanism of action. The two best Nbs were subjected to a detailed investigation of their interaction mechanism that revealed important differences in their binding kinetics and equilibrium thermodynamics. These distinct behaviors at the biophysical level translate into an equally efficient inhibition of the cellular EGFR phosphorylation, thus proving the efficacy of these Nbs to turn off the initiation of this key oncogenic pathway in cancer cells.
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