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Single-pass Transmembrane Proteins01:25

Single-pass Transmembrane Proteins

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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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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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 types have...
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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.
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Updated: May 28, 2026

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
10:49

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

Published on: March 5, 2017

Bilayer hydrophobic thickness and integral membrane protein function.

Larisa E Cybulski1, Diego de Mendoza

  • 1Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET) and Departamento de Microbiología, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531 (S2002LRK) Rosario, Argentina. cybulski@ibr.gov.ar

Current Protein & Peptide Science
|November 3, 2011
PubMed
Summary
This summary is machine-generated.

Membrane protein function is influenced by lipid bilayer thickness. Mismatched hydrophobic thicknesses between proteins and bilayers can alter protein structure and activity, impacting biological processes.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The lipid environment critically influences membrane protein function.
  • Molecular mechanisms of protein-lipid interactions are not fully understood.
  • Membrane lipid composition regulates membrane protein activity.

Purpose of the Study:

  • To review how hydrophobic core thickness affects transmembrane protein activity.
  • To explore the relationship between lipid bilayer thickness and protein function.

Main Methods:

  • Literature review of studies on transmembrane proteins and lipid bilayers.
  • Analysis of experimental data correlating protein activity with membrane properties.

Main Results:

  • Hydrophobic thickness matching is crucial for integral membrane proteins.
  • Mismatches in hydrophobic thickness can induce structural changes in proteins or bilayers.
  • Altered protein or bilayer structures can lead to significant changes in protein activity.

Conclusions:

  • Hydrophobic core thickness is a key determinant of membrane protein function.
  • Understanding protein-lipid hydrophobic thickness matching is vital for predicting and modulating protein activity.
  • Further research into these interactions can reveal novel therapeutic targets.