Proteolysis-targeting chimera (PROTAC) in cancer: design principles and applications on "undruggable" targets

Xun Lu1,2,3, Jianliang Qin4, Shuilin Dong1,2,3

  • 1Division of Hepato-Pancreato-Biliary Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, 1095 Jiefang Avenue, Wuhan, 430030, China.

Biomarker Research
|May 22, 2026
PubMed

Insights

Proteolysis-targeting chimeras (PROTACs) offer a novel approach to target previously "undruggable" cancer proteins. This review details PROTAC design, delivery, and its potential to expand cancer therapy options.

Area of Science:

  • Oncology
  • Molecular Biology
  • Drug Discovery

Background:

  • Targeted cancer therapies aim to improve efficacy and reduce side effects by modulating biomolecule distribution.
  • Many critical cancer-related proteins remain

Purpose of the Study:

  • To provide a comprehensive overview of proteolysis-targeting chimeras (PROTACs) for targeting
  • To discuss the design principles of PROTACs, including ligands, linkers, and ternary complex prediction.
  • To review the application of PROTACs against challenging

Main Methods:

  • Detailed elaboration on the design of protein of interest (POI) ligands, E3 ligase ligands, and linkers.
  • Prediction of PROTAC ternary complex structures.
  • Review of PROTAC delivery systems and carrier utilization.

Main Results:

  • Discussion on the current status of PROTACs targeting key
  • Analysis of the advantages and disadvantages of PROTAC delivery systems.
  • Exploration of PROTACs' potential in overcoming resistance mechanisms.

Conclusions:

  • PROTACs represent a promising strategy for targeting previously undruggable proteins in cancer therapy.
  • Further research into PROTAC design and delivery systems is crucial for clinical translation.
  • PROTAC technology has the potential to significantly broaden the scope of therapeutic targets in oncology.

Related Concept Videos

Targeted Cancer Therapies02:57

Targeted Cancer Therapies

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.
There are several types of targeted therapies against specific...
Targeted Cancer Therapies02:57

Targeted Cancer Therapies

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.
There are several types of targeted therapies against specific...
Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Pharmacogenomics: Identification of New Drug Targets01:29

Pharmacogenomics: Identification of New Drug Targets

Advances in genomics have profoundly influenced drug discovery by increasing both the speed and accuracy of pharmaceutical development. Pharmacogenomics, which examines how genetic variation influences drug response, facilitates the identification of novel therapeutic targets and enables patient stratification for personalized treatment. These strategies contribute to improved drug efficacy, minimized adverse effects, and more efficient clinical trial design.Mapping genetic differences...
Combination Therapies and Personalized Medicine02:50

Combination Therapies and Personalized Medicine

Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
The combination of the drug acetazolamide and sulforaphane is a good example of combination therapy to treat cancer. The cells in the interior of a large tumor often die due to the hypoxic and...