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Related Concept Videos

Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

83.2K
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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Single-pass Transmembrane Proteins01:25

Single-pass Transmembrane Proteins

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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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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Membrane Proteins01:30

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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Membrane Proteins01:30

Membrane Proteins

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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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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Updated: Mar 19, 2026

Protein Membrane Overlay Assay: A Protocol to Test Interaction Between Soluble and Insoluble Proteins in vitro
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Membrane proteins: always an insoluble problem?

Andrea E Rawlings1

  • 1Department of Chemistry, The University of Sheffield, Sheffield, U.K. a.rawlings@sheffield.ac.uk.

Biochemical Society Transactions
|June 11, 2016
PubMed
Summary
This summary is machine-generated.

Researchers explore novel methods for studying membrane proteins, focusing on creating water-soluble variants and utilizing fusion proteins. This facilitates easier, high-yield purification and structural analysis of these crucial cellular components.

Keywords:
membrane proteinsprotein engineeringprotein stabilityprotein structure

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Pharmacology

Background:

  • Membrane proteins are vital for cellular functions and drug development.
  • Their hydrophobic nature complicates extraction and study, often requiring detergents.
  • Efficient methods for soluble membrane protein production are needed.

Purpose of the Study:

  • To review innovative strategies for obtaining water-soluble membrane proteins.
  • To discuss the redesign of membrane proteins into soluble forms.
  • To explore the use of solubilizing fusion proteins and naturally soluble variants.

Main Methods:

  • Review of literature on membrane protein solubilization techniques.
  • Analysis of strategies involving protein redesign for water solubility.
  • Examination of naturally occurring water-soluble membrane protein assemblies.

Main Results:

  • Redesigning membrane proteins can yield stable, water-soluble variants.
  • Solubilizing fusion proteins aid in the purification and study of membrane proteins.
  • Some membrane proteins naturally exist in stable, water-soluble forms.

Conclusions:

  • Innovative approaches are advancing membrane protein research.
  • Easier expression, purification, and characterization of membrane proteins are achievable.
  • These methods enhance the study of important pharmacological targets.