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Related Concept Videos

Regulated Protein Degradation02:58

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Modular Development of Enzyme-Activatable Proteolysis Targeting Chimeras for Selective Protein Degradation and Cancer

Yanchi Chen1,2, Lina Zhang1, Lincheng Fang1

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Enzyme-activatable proteolysis targeting chimeras (PROTACs) selectively degrade proteins in cancer cells. This novel approach minimizes toxicity in healthy tissues, offering a safer cancer therapy.

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Area of Science:

  • Biochemistry
  • Medicinal Chemistry
  • Oncology

Background:

  • Proteolysis targeting chimeras (PROTACs) offer therapeutic potential but face challenges with on-target, off-site toxicity in normal tissues due to indiscriminate protein degradation.
  • Developing targeted PROTACs is crucial for enhancing therapeutic efficacy and patient safety.

Purpose of the Study:

  • To engineer enzyme-activatable PROTACs for cancer-specific protein degradation, thereby mitigating toxicity in healthy cells.
  • To develop a modular platform for creating cell-selective PROTACs using enzyme-responsive linkers.

Main Methods:

  • Design and synthesis of enzyme-activatable PROTACs utilizing enzyme-recognition moieties and a methylene alkoxy carbamate (MAC) self-immolative linker.
  • Evaluation of PROTACs for selective protein degradation in cancer cells versus nonmalignant cells.
  • Assessment of *in vivo* antitumor efficacy and off-tumor toxicity.

Main Results:

  • Identification of the MAC unit as a stable and efficient linker for enzyme-activatable PROTACs.
  • Development of PROTACs activated by specific cancer-associated enzymes, including a dual-enzyme-activatable PROTAC.
  • Demonstration of highly selective protein degradation in cancer cells, potent *in vivo* antitumor activity, and absence of off-tumor toxicity.
  • Proof-of-concept for broad applicability by conjugating various PROTACs and E3 ligases.

Conclusions:

  • Enzyme-activatable PROTACs represent a promising strategy to overcome the toxicity limitations of conventional PROTACs.
  • This modular approach enables targeted cancer therapy with enhanced selectivity and safety.
  • The developed platform opens new avenues for the design of next-generation targeted therapeutics.