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Related Concept Videos

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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Porin Insertion in the Outer Mitochondrial Membrane01:12

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
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Structure of Porins01:21

Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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Membrane Domains01:18

Membrane Domains

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Related Experiment Video

Updated: Nov 10, 2025

From Constructs to Crystals – Towards Structure Determination of β-barrel Outer Membrane Proteins
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Membrane Barrels Are Taller, Fatter, Inside-Out Soluble Barrels.

Rik Dhar1, Ryan Feehan2, Joanna S G Slusky1,2

  • 1Department of Molecular Biosciences, The University of Kansas, 1200 Sunnyside Avenue, Lawrence, Kansas 66045, United States.

The Journal of Physical Chemistry. B
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Membrane beta-barrels are larger, wider, and taller than soluble beta-barrels. These proteins exhibit an "inside-out" structure with more regular amino acid alternation, aiding their function in cell membranes.

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Area of Science:

  • Structural biology
  • Biochemistry
  • Membrane protein research

Background:

  • Beta-barrel (β-barrel) proteins adopt similar topologies in both membrane and soluble environments.
  • Understanding environmental adaptations versus inherent fold characteristics is crucial for protein function.

Purpose of the Study:

  • To compare structural features of membrane β-barrels and soluble β-barrels.
  • To identify features specific to the membrane environment versus the β-barrel fold.

Main Methods:

  • Comparative analysis of protein structures.
  • Evaluation of size, shape, amino acid composition, hydrophobicity, and periodicity.

Main Results:

  • Membrane β-barrels are larger, with more strands and amino acids per strand, resulting in greater width and height.
  • Membrane β-barrels display an "inside-out" soluble β-barrel characteristic regarding hydrophobicity.
  • Membrane β-barrels show more regular amino acid alternation in strands compared to soluble counterparts.

Conclusions:

  • Structural differences in size, shape, and amino acid periodicity distinguish membrane from soluble β-barrels.
  • The "inside-out" and regular alternation features are key to membrane β-barrel stability and function within the lipid bilayer.