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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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Mitochondrial Precursor Proteins01:39

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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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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Multi-pass Transmembrane Proteins and β-barrels01:09

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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
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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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Membrane Fluidity01:23

Membrane Fluidity

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Updated: Jan 8, 2026

Determining Membrane Protein Topology Using Fluorescence Protease Protection FPP
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Determining Membrane Protein Topology Using Fluorescence Protease Protection FPP

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MemPrO: A Predictive Tool for Membrane Protein Orientation.

Matyas Parrag1, Phillip J Stansfeld1,2

  • 1School of Life Sciences, University of Warwick, Coventry CV4 7AL, U.K.

Journal of Chemical Theory and Computation
|December 23, 2025
PubMed
Summary
This summary is machine-generated.

MemPrO precisely orients membrane proteins in complex cellular environments. This new tool aids molecular simulations and structural analysis of cellular envelopes, advancing research and therapeutics.

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Last Updated: Jan 8, 2026

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Area of Science:

  • Biochemistry and structural biology
  • Computational biology and bioinformatics
  • Cell biology

Background:

  • Membrane proteins are crucial for cellular functions like transport and communication.
  • Accurate protein orientation in lipid bilayers is vital for molecular simulations and structural studies.
  • Existing tools face limitations with complex membrane systems and peripheral proteins.

Purpose of the Study:

  • Introduce MemPrO, a novel computational tool for precise membrane protein orientation.
  • Address limitations of current tools in handling complex membrane environments.
  • Enhance modeling and interpretation of cellular envelope architecture.

Main Methods:

  • Developed MemPrO for orienting membrane-associated proteins.
  • Enabled detailed orientation data for single and double membrane systems.
  • Integrated analysis of membrane curvature and bacterial cell wall positioning.

Main Results:

  • MemPrO accurately orients diverse membrane proteins.
  • Provides detailed spatial arrangement data relative to lipid bilayers.
  • Successfully predicts bacterial cell wall position and orientation.

Conclusions:

  • MemPrO offers enhanced capabilities for modeling cellular envelopes.
  • Facilitates deeper understanding of membrane-protein interactions.
  • Supports fundamental research and development of new therapeutic strategies.