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Introduction to Membrane Proteins

Introduction to Membrane Proteins

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 types have...

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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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Membrane Proteins

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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...

Membrane Proteins

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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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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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Updated: Jun 13, 2026

Native Cell Membrane Nanoparticles System for Membrane Protein-Protein Interaction Analysis

Native Cell Membrane Nanoparticles System for Membrane Protein-Protein Interaction Analysis

Published on: July 16, 2020

Membrane composition-mediated protein-protein interactions.

Benedict J Reynwar¹, Markus Deserno

¹Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

|April 23, 2010

Summary

This summary is machine-generated.

This study reveals how proteins interact on lipid bilayers near critical demixing. Membrane composition influences protein interactions, with simulations aligning with theoretical predictions of interaction range.

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Single Molecule Methods for Monitoring Changes in Bilayer Elastic Properties

Single Molecule Methods for Monitoring Changes in Bilayer Elastic Properties

Published on: November 3, 2008

Area of Science:

Membrane biophysics
Soft matter physics
Computational biology

Background:

Proteins interacting with lipid bilayers are crucial for cellular functions.
Understanding these interactions is key to deciphering membrane organization and dynamics.
Lipid bilayers near critical demixing exhibit complex compositional fluctuations.

Purpose of the Study:

To investigate membrane composition-mediated interactions between adsorbed proteins.
To compare simulation results with theoretical predictions from Ginzburg-Landau theory.
To explore the applicability of the theoretical framework to various membrane systems.

Main Methods:

Coarse-grained molecular dynamics simulations of lipid-protein systems.
Utilizing a phenomenological Ginzburg-Landau theory for analytical predictions.
Analyzing protein adsorption, lipid composition profiles, and protein-protein pair correlations.

Main Results:

Simulations show proteins binding preferentially to specific lipid species.
Measured composition profiles and pair correlations agree with theoretical predictions.
Observed interaction range between proteins exceeded the single profile correlation length.

Conclusions:

Membrane composition significantly mediates protein-protein interactions near critical demixing.
Ginzburg-Landau theory provides a valid framework for describing these interactions.
The methodology is extendable to curved membranes and other embedded scalar fields.