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Related Concept Videos

Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

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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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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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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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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

6.5K
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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GPI Anchoring of Proteins in the ER Membrane01:29

GPI Anchoring of Proteins in the ER Membrane

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GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
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Related Experiment Video

Updated: Feb 14, 2026

High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method
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High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method

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An efficient screening method for purifying and crystallizing membrane proteins using modified clear-native PAGE.

Nanao Suzuki1, Yuuki Takamuku1, Tomohiro Asakawa2

  • 1Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage, Chiba 263-8522, Japan.

Analytical Biochemistry
|February 13, 2018
PubMed
Summary
This summary is machine-generated.

A new Clear Native polyacrylamide gel electrophoresis (CN-PAGE) method with modified Coomassie Blue (mCBB) stain rapidly screens membrane protein crystallization conditions. This technique optimizes solubilization and purification for integral membrane proteins like the A2A adenosine receptor.

Keywords:
Clear-native PAGECrystallizationG protein-coupled receptorMembrane proteinsPurificationStability

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Crystallization of Membrane Proteins in Lipidic Mesophases
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Crystallization of Membrane Proteins in Lipidic Mesophases

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Crystallization of Membrane Proteins in Lipidic Mesophases
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Crystallization of Membrane Proteins in Lipidic Mesophases

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Membrane Protein Research

Background:

  • Membrane proteins are crucial for cellular communication but challenging to study structurally due to instability.
  • X-ray crystallography of membrane proteins is hindered by difficulties in obtaining stable, crystallized samples.
  • Current optimization methods for membrane protein crystallization are resource-intensive and time-consuming.

Purpose of the Study:

  • To develop a rapid precrystallization screening method for membrane proteins.
  • To optimize solubilization, purification, and crystallization conditions for membrane proteins.
  • To demonstrate the utility of the method using the A2A adenosine receptor (A2AAR).

Main Methods:

  • Utilized Clear Native polyacrylamide gel electrophoresis (CN-PAGE).
  • Employed a modified Coomassie Brilliant Blue G-250 (mCBB) stain with reduced sodium formate.
  • Applied in-gel fluorescence detection using a red fluorescent protein fusion of A2AAR.

Main Results:

  • The mCBB CN-PAGE method enabled rapid screening of conditions for membrane protein stability.
  • Optimization of solubilization, purification, and crystallization was achieved using the A2AAR membrane fraction.
  • The method allowed screening without extensive purification procedures.

Conclusions:

  • The mCBB CN-PAGE technique offers a fast and efficient approach for membrane protein precrystallization screening.
  • This method significantly reduces the time and sample requirements for optimization.
  • The technique shows broad applicability for diverse integral membrane proteins.