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Updated: Sep 22, 2025

Discovering Protein Interactions and Characterizing Protein Function Using HaloTag Technology
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Recent biomedical advances enabled by HaloTag technology.

Weiyu Chen1,2, Muhsin H Younis3, Zhongkuo Zhao1

  • 1The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, 322000, China.

Biocell : Official Journal of the Sociedades Latinoamericanas De Microscopia Electronica ... Et. Al
|May 23, 2022
PubMed
Summary

HaloTag, a self-labeling enzyme tag, offers superior accuracy and specificity for protein labeling compared to traditional methods. This review highlights its diverse applications in imaging, immobilization, and targeted degradation for advancing biological research.

Keywords:
Biomolecule interactionHaloTagMolecular imagingPositron emission tomographySite-specific labeling

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Area of Science:

  • Biochemistry and Molecular Biology
  • Biotechnology and Bioengineering

Background:

  • Understanding protein interactions is crucial for deciphering disease mechanisms and developing therapeutic strategies.
  • Traditional protein labeling methods using fluorescent and affinity tags suffer from limitations like autofluorescence and weak binding, impacting accuracy and specificity.
  • HaloTag, a self-labeling enzyme (SLE) tag, provides a solution with rapid, covalent bond formation for precise protein labeling.

Purpose of the Study:

  • To review the development and advancements of the HaloTag technique.
  • To explore the diverse applications of HaloTag in biological research, including imaging, immobilization, and targeted degradation.
  • To discuss the future directions and challenges associated with HaloTag technology.

Main Methods:

  • Review of existing literature and studies utilizing the HaloTag system.
  • Summarization of applications such as in vitro and in vivo imaging, biomolecule immobilization, and targeted protein degradation.
  • Analysis of the technical advantages of HaloTag over conventional labeling methods.

Main Results:

  • HaloTag enables fast and specific labeling of proteins of interest (POI) through covalent bond formation with its ligand.
  • The technique demonstrates high accuracy and specificity, overcoming limitations of traditional tagging methods.
  • Successful applications span various fields, including cellular imaging, microorganism imaging, protein collection, interaction studies, and targeted degradation (e.g., L-AdPROM).

Conclusions:

  • HaloTag is a valuable and versatile tool for a wide range of biological applications, enhancing accuracy and specificity in protein studies.
  • The technique has proven effective in numerous studies, offering significant advantages for research in molecular biology and biotechnology.
  • Further research and development are expected to expand the utility and address challenges in HaloTag applications.