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Related Concept Videos

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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Introduction to Membrane Proteins01:16

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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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RNA Stability01:53

RNA Stability

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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Protein Diffusion in the Membrane01:24

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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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Nuclear Stability03:18

Nuclear Stability

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Related Experiment Video

Updated: Feb 6, 2026

PeptiQuick, a One-Step Incorporation of Membrane Proteins into Biotinylated Peptidiscs for Streamlined Protein Binding Assays
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PeptiQuick, a One-Step Incorporation of Membrane Proteins into Biotinylated Peptidiscs for Streamlined Protein Binding Assays

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The Peptidisc, a simple method for stabilizing membrane proteins in detergent-free solution.

Michael Luke Carlson1, John William Young1, Zhiyu Zhao1

  • 1Department of Biochemistry and Molecular Biology, Faculty of Medicine, Life Sciences Institute, University of British Columbia, Vancouver, Canada.

Elife
|August 16, 2018
PubMed
Summary

Peptidisc technology offers a simple, cost-effective way to stabilize difficult membrane proteins. This universal tool captures proteins into water-soluble particles without extra lipids, aiding biological studies.

Keywords:
E. colibiochemistrychemical biologymembrane proteinmolecular biophysicsnanoparticlespeptideself-assemblystructural biology

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Membrane Protein Research

Background:

  • Membrane proteins present significant challenges in research due to their insolubility and instability in detergents.
  • Existing methods like nanodiscs require specific scaffold proteins and lipids, complicating reconstitution.

Purpose of the Study:

  • To introduce peptidisc technology as a universal and efficient method for stabilizing membrane proteins.
  • To demonstrate the applicability of peptidisc reconstitution across various membrane protein systems and purification strategies.

Main Methods:

  • Utilizing a short amphipathic bi-helical peptide (NSPr) for peptidisc formation around target membrane proteins.
  • Embedding peptidisc reconstitution within standard purification workflows ('on-column', 'in-gel', 'on-bead').
  • Testing the method with diverse membrane protein assemblies including MalFGK2, FhuA, SecYEG, OmpF, and BRC.

Main Results:

  • Peptidisc reconstitution requires only the peptide and no additional lipids, simplifying the process.
  • The method successfully stabilized five different membrane protein assemblies.
  • Demonstrated effective reconstitution across multiple purification formats.

Conclusions:

  • Peptidisc technology provides a rapid, cost-effective, and universal solution for membrane protein stabilization.
  • This approach facilitates high-throughput studies and advances the understanding of membrane protein function and structure.