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Related Concept Videos

Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

81.7K
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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Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to...
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Mechanical Protein Functions01:58

Mechanical Protein Functions

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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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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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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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Updated: Feb 13, 2026

Low Molecular Weight Protein Enrichment on Mesoporous Silica Thin Films for Biomarker Discovery
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Functionally Active Membrane Proteins Incorporated in Mesostructured Silica Films.

Justin P Jahnke, Matthew N Idso, Sunyia Hussain

    Journal of the American Chemical Society
    |March 14, 2018
    PubMed
    Summary

    This study presents a new method for incorporating high concentrations of active membrane proteins into silica materials. This technique enhances protein stability and function within mesostructured silica films, paving the way for advanced biomaterials.

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    Area of Science:

    • Materials Science
    • Biochemistry
    • Nanotechnology

    Background:

    • Membrane proteins are crucial for cellular functions but challenging to stabilize for applications.
    • Mesoporous silica offers a scaffold for biomolecules, but protein incorporation remains difficult.
    • Achieving high concentrations of functionally active proteins in such materials is a key challenge.

    Purpose of the Study:

    • To develop a versatile synthetic protocol for incorporating functionally active membrane proteins into mesostructured silica materials.
    • To demonstrate the stabilization and native-like function of membrane proteins within these silica composites.
    • To explore the potential of this method for creating advanced biomaterials with enhanced protein stability.

    Main Methods:

    • Coassembly of membrane proteins (proteorhodopsin, cytochrome c) with silica precursors and various surfactants (nonionic, lipid-like, perfluorinated) under mild acidic conditions.
    • Utilized worm-like mesostructured silica films for protein incorporation.
    • Characterization using small-angle X-ray scattering, electron paramagnetic resonance, and transient UV-visible spectroscopy.

    Main Results:

    • Achieved high concentrations (up to 15 wt %) of functionally active proteorhodopsin in mesostructured silica films.
    • Proteins in silica films exhibited native-like function and enhanced thermal stability compared to traditional environments.
    • Demonstrated the protocol's generality by incorporating active cytochrome c into silica-cationic surfactant films.

    Conclusions:

    • A versatile synthetic protocol enables high-concentration incorporation of active membrane proteins into ordered mesostructured silica.
    • The resulting protein-silica composites display enhanced stability and native-like functionality.
    • This method holds promise for developing novel biomaterials and biosensors utilizing membrane proteins.