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J Am Chem Soc. 2018 Dec 12;140(49):17019-17026. doi: 10.1021/jacs.8b08008. Epub 2018 Nov 28.

Addressing Kinase-Independent Functions of Fak via PROTAC-Mediated Degradation.

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Department of Molecular, Cellular & Developmental Biology , Yale University , New Haven , Connecticut 06511 , United States.
Department of Chemistry , Yale University , New Haven , Connecticut 06511 , United States.
Department of Pharmacology , Yale University , New Haven , Connecticut 06511 , United States.


Enzymatic inhibition has proven to be a successful modality for the development of many small-molecule drugs. In recent years, small-molecule-induced protein degradation has emerged as an orthogonal therapeutic strategy that has the potential to expand the druggable target space. Focal adhesion kinase (Fak) is a key player in tumor invasion and metastasis, acting simultaneously as a kinase and a scaffold for several signaling proteins. While previous efforts to modulate Fak activity were limited to kinase inhibitors with low success in clinical studies, protein degradation offers a possibility to simultaneously block Fak's kinase signaling and scaffolding capabilities. Here, we report the development of a selective and potent Fak degrader, PROTAC-3, which outperforms a clinical candidate, defactinib, with respect to Fak activation as well as Fak-mediated cell migration and invasion. These results underline the potential that PROTACs offer in expanding the druggable space and controlling protein functions that are not easily addressed by traditional small-molecule therapeutics.

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