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Related Experiment Video

Updated: Sep 12, 2025

Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
08:27

Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy

Published on: January 7, 2019

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Utilizing native nanodiscs to isolate active TRPC3 channels and expand structural analysis capabilities.

Jasmin Baron1, Lena Bauernhofer2,3,4, Sandro Keller2,3,4

  • 1Gottfried Schatz Research Center, Division of Medical Physics and Biophysics, Medical University of Graz, Graz, Austria. jasmin.baron@medunigraz.at.

Scientific Reports
|August 5, 2025
PubMed
Summary
This summary is machine-generated.

Researchers identified optimal extraction agents, dodecyl diglucoside (DDDG) and n-dodecyl-β-D-maltoside (DDM), for purifying the TRPC3 channel. This breakthrough enables further structural biology studies of TRPC3 function and therapeutic development.

Keywords:
ElectrophysiologyNanodiscsProtein purificationReconstitutionTRPC3

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Last Updated: Sep 12, 2025

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Area of Science:

  • Structural biology
  • Molecular biophysics
  • Ion channel research

Background:

  • Transient Receptor Potential Canonical 3 (TRPC3) channels are crucial in physiological processes, but their function is poorly understood due to limited structural data, especially of the open pore.
  • Elucidating the TRPC3 open-pore conformation via cryogenic electron microscopy (cryo-EM) is vital for understanding its role and therapeutic potential.
  • Challenges in isolating functional TRPC3 complexes hinder structural studies.

Purpose of the Study:

  • To evaluate novel extraction agents for isolating functional TRPC3 complexes.
  • To identify optimal conditions for TRPC3 expression and purification for structural analysis.
  • To preserve the native tetrameric structure and activity of TRPC3.

Main Methods:

  • Screening of various extraction agents, including dodecyl diglucoside (DDDG) and n-dodecyl-β-D-maltoside (DDM), against conventional detergents.
  • TRPC3 expression optimization in HEK293, Komagataella phaffii, and Expi293F cell lines, with Expi293F identified as optimal.
  • Purification of TRPC3 complexes under native conditions.
  • Characterization using cryogenic electron microscopy (cryo-EM), mass spectrometry, and patch-clamp electrophysiology.

Main Results:

  • Expi293F cells provided the best expression levels for TRPC3.
  • DDDG and DDM proved most effective in extracting functional TRPC3.
  • Successfully purified native, tetrameric TRPC3 complexes retaining channel activity.
  • Structural integrity and activity confirmed by cryo-EM, mass spectrometry, and patch-clamp analysis.

Conclusions:

  • The selection of appropriate extraction agents is critical for advancing TRPC3 structural biology research.
  • Novel agents like DDDG and DDM facilitate the isolation of functional TRPC3, paving the way for detailed structural studies.
  • This work supports future therapeutic development targeting TRPC3 channel function.