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Protein Pull-down Assay Using HiBiT-tag-dependent Luciferase Activity Measurement.

Masashi Arakawa1, Eiji Morita1

  • 1Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, 3 Bunkyo-cho, Hirosaki-shi, Aomori, Japan.

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|March 27, 2023
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Summary

This study introduces a highly sensitive HiBiT technology for detecting proteins in pull-down assays, overcoming western blotting limitations. The method confirmed a Japanese encephalitis virus protein complex crucial for flavivirus replication.

Keywords:
FlavivirusHiBiT tagJapanese encephalitis virusPull-down assaySplit nano luciferase

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Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • Co-immunoprecipitation and pull-down assays are standard for studying protein-protein interactions.
  • Western blotting, commonly used for prey protein detection, suffers from low sensitivity and quantification issues.
  • The NanoLuc luciferase system with HiBiT-tag offers a highly sensitive alternative for detecting low protein quantities.

Purpose of the Study:

  • To present a method utilizing HiBiT technology for enhanced prey protein detection in pull-down assays.
  • To validate the HiBiT system's efficacy in analyzing protein complex formation.

Main Methods:

  • Adaptation of HiBiT-tag technology for prey protein detection in pull-down experiments.
  • Application of the developed protocol to investigate interactions involving Japanese encephalitis virus NS4B.

Main Results:

  • Successful implementation of HiBiT technology for sensitive detection of prey proteins in pull-down assays.
  • Demonstration of the formation of a ternary complex involving Japanese encephalitis virus NS4B, valosin-containing protein, and nuclear protein localization protein 4.

Conclusions:

  • HiBiT technology provides a sensitive and effective method for detecting proteins in pull-down assays, surpassing traditional western blotting.
  • The findings confirm a critical host-pathogen interaction complex essential for flavivirus replication, highlighting the utility of HiBiT in virological studies.