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Related Concept Videos

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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Membrane shape modulates transmembrane protein distribution.

Sophie Aimon1, Andrew Callan-Jones2, Alice Berthaud3

  • 1Centre de Recherche, Institut Curie, Paris F-75248, France; CNRS, PhysicoChimie Curie, UMR168, Paris F-75248, France; Université Pierre et Marie Curie, Paris F-75252, France; Kavli Institute for Brain and Mind, UCSD, La Jolla, CA 92093, USA.

Developmental Cell
|February 1, 2014
PubMed
Summary
This summary is machine-generated.

Membrane shape influences transmembrane protein targeting. Researchers found potassium channels (KvAP) accumulate in curved membrane nanotubes, unlike water channels (AQP0), revealing curvature

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Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Protein Dynamics

Background:

  • Cell membrane shape varies significantly.
  • The role of membrane curvature in transmembrane protein targeting remains unclear due to complex cellular sorting mechanisms.

Purpose of the Study:

  • To isolate and investigate the impact of membrane curvature on transmembrane protein localization.
  • To determine if membrane shape influences the distribution of specific membrane proteins.

Main Methods:

  • Utilized cell-sized giant unilamellar vesicles (GUVs) to create membrane nanotubes with controlled radii.
  • Incorporated potassium channel KvAP and water channel AQP0 into GUVs.
  • Employed fluorescence recovery after photobleaching (FRAP) to assess protein diffusion.
  • Applied a thermodynamic sorting model to analyze protein effects on membrane properties.

Main Results:

  • KvAP showed enrichment in membrane nanotubes, with higher concentrations in more curved regions.
  • AQP0 distribution was similar in both flat and curved membrane regions.
  • Both KvAP and AQP0 diffused freely between the GUV and nanotube neck.

Conclusions:

  • Membrane curvature is a significant factor in the targeting of transmembrane proteins like KvAP.
  • Developed a novel method to quantify the effective shape and flexibility of membrane proteins based on their interaction with membrane curvature.