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Related Concept Videos

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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Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

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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.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
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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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Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Fluid Mosaic Model01:19

Fluid Mosaic Model

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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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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Related Experiment Video

Updated: Aug 15, 2025

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

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Membrane Proteins: Structure, Function and Motion.

Masoud Jelokhani-Niaraki1

  • 1Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada.

International Journal of Molecular Sciences
|January 8, 2023
PubMed
Summary

Cell membranes are complex structures with variable morphology and composition. Understanding these intricate biological barriers is key to advancing cell biology research.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Cell membranes act as dynamic barriers, regulating molecular transport and cellular signaling.
  • Their complex composition includes lipids, proteins, and carbohydrates, influencing membrane function.
  • Membrane morphology and chemical variability present challenges in understanding cellular processes.

Discussion:

  • The intricate nature of cell membranes necessitates advanced analytical techniques for comprehensive study.
  • Variability in membrane composition and structure impacts cellular responses and interactions.
  • Investigating supramolecular organization is crucial for elucidating membrane functions.

Key Insights:

  • Cell membranes are highly complex, multicomponent supramolecular assemblies.

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Last Updated: Aug 15, 2025

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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  • Morphology and chemical composition are intrinsically variable and functionally significant.
  • Understanding this complexity is fundamental to cell biology.

    • Outlook:

    • Future research should focus on high-resolution imaging and multi-omics approaches.
    • Developing models that capture membrane dynamics and heterogeneity is essential.
    • Elucidating structure-function relationships will drive therapeutic innovations.