Targeted Protein Degradation Foundations
Rewriting drug discovery via cellular cleanup machinery
Drugs have traditionally worked by binding to a protein and blocking its function. But roughly 80% of human proteins lack an obvious binding pocket, leaving much of biology effectively "undruggable." Targeted protein degradation overturns this paradigm by recruiting the cell's own waste-disposal machinery to selectively destroy a target protein instead of merely inhibiting it. This new mechanism does not require a conventional binding pocket, dramatically expanding the range of proteins that can be therapeutically targeted, and has already been used in several FDA-approved drugs. The field emerged through a striking convergence of three independent scientific journeys. The first began with the thalidomide tragedy, one of the biggest public health crises that helped shape today's FDA drug approval process. The other two arose from the discovery of molecular glues that induce new protein-protein interactions and the invention of heterobifunctional molecules that recruit targeted proteins to the cell's waste disposal system. This lens follows the seminal works that brought these threads together into the modern framework of targeted protein degradation.
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The thalidomide catastrophe and clinical resurrection

  • The Story of Thalidomide in the U.S., Told Through Documents

  • Frances Oldham Kelsey: Medical reviewer famous for averting a public health tragedy

  • Reform, Regulation, and Pharmaceuticals — The Kefauver–Harris Amendments at 50

    • Chemically induced proximity

  • The Rise of Molecular Glues

    • Bifunctional targeted protein degraders

  • Protacs: Chimeric molecules that target proteins to the Skp1–Cullin–F box complex for ubiquitination and degradation

    • Structural and biophysical mechanism

  • Identification of a Primary Target of Thalidomide Teratogenicity

  • Lenalidomide Causes Selective Degradation of IKZF1 and IKZF3 in Multiple Myeloma Cells

  • The Myeloma Drug Lenalidomide Promotes the Cereblon-Dependent Destruction of Ikaros Proteins

  • Targeted Protein Degradation | MOA Animation