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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
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Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all genes in the human genome code for transporters or transporter-related proteins.
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Introduction to Solid Supported Membrane Based Electrophysiology
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Transporter function characterization via continuous-exchange cell-free synthesis and solid supported membrane-based

Fang Dong1, Pawel Lojko1, Andre Bazzone2

  • 1The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Denmark.

Bioelectrochemistry (Amsterdam, Netherlands)
|May 29, 2024
PubMed
Summary

We developed a new workflow for transporter characterization using cell-free protein synthesis and electrophysiology. This rapid method enables functional assessment of diverse membrane transporters, aiding medical and biotech research.

Keywords:
Cell-free protein synthesisNanodiscsSolid supported membrane-based electrophysiologyTransporterTransporter assay

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Area of Science:

  • Biochemistry
  • Biophysics
  • Molecular Biology

Background:

  • Current transporter assays are costly and technically challenging, hindering functional characterization.
  • Efficient methods are needed to study membrane transporter activity for various applications.

Purpose of the Study:

  • To develop and validate a novel, cost-effective workflow for the functional characterization of membrane transporters.
  • To combine cell-free protein synthesis (CFPS) with solid supported membrane-based electrophysiology (SSME) for transporter analysis.

Main Methods:

  • Membrane proteins were synthesized using a continuous exchange cell-free system (CECF) with nanodiscs.
  • Transporters were incorporated into proteoliposomes and functionally assayed using surface electrogenic event reader.
  • The workflow was validated by characterizing five diverse transporters, including antiporters and permeases.

Main Results:

  • The workflow successfully expressed and characterized five distinct transporters: EmrE, SugE, LacY, NhaA, and AAC2.
  • Key kinetic parameters (KM, IMAX, pH dependency) were evaluated for all tested transporters.
  • The entire workflow can be completed within five workdays, demonstrating its speed and robustness.

Conclusions:

  • This integrated CFPS-SSME workflow provides a rapid and direct method for functional transporter assessment.
  • The approach overcomes limitations of traditional assays, facilitating transporter research in medicine and biotechnology.