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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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Plasma membranes have integral transmembrane proteins involved in facilitated transport. These proteins are collectively referred to as transport proteins, and they function as either channels for the material or as carriers themselves. Channel proteins have hydrophilic domains exposed to the intracellular and extracellular fluids and a hydrophilic channel through their core that provides a hydrated opening for solutes to pass through the membrane layers. Passage through the channel allows...
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Probing membrane protein properties using droplet interface bilayers.

Maxwell Allen-Benton1, Heather E Findlay1, Paula J Booth1

  • 1Department of Chemistry, King's College London, London SE1 1DB, UK.

Experimental Biology and Medicine (Maywood, N.J.)
|May 5, 2019
PubMed
Summary
This summary is machine-generated.

Droplet interface bilayers offer stable, complex artificial membranes for integral membrane protein studies. This review guides their use and presents a novel flippase protein study.

Keywords:
Membrane proteinsartificial bilayerdroplet interface bilayerflippasesynthetic biology

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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • Biophysics

Background:

  • Integral membrane proteins are crucial for cellular functions but challenging to study in vitro.
  • Traditional artificial lipid bilayer methods have limitations in stability and complexity.
  • Droplet interface bilayers (DIBs) present a novel approach to creating robust artificial membrane environments.

Purpose of the Study:

  • To provide a comprehensive review of integral membrane protein studies using droplet interface bilayers.
  • To highlight the advantages of DIBs, including enhanced stability and physicochemical complexity.
  • To introduce a novel in vitro study of a flippase protein reconstituted in a DIB.

Main Methods:

  • Review of existing literature on integral membrane protein functional studies using DIBs.
  • Construction and characterization of DIBs for protein reconstitution.
  • In vitro functional assay of a flippase protein within a DIB environment.

Main Results:

  • DIBs offer superior stability and tunable complexity for membrane protein research.
  • The review consolidates current knowledge and methodologies for DIB-based protein studies.
  • Successful reconstitution and functional assessment of a flippase protein in a DIB were achieved.

Conclusions:

  • Droplet interface bilayers are a powerful and versatile platform for studying integral membrane proteins.
  • DIBs facilitate advanced in vitro functional studies and hold potential for synthetic biology applications.
  • This work advances the methodology for membrane protein research using artificial bilayer systems.