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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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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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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Vesicular Membrane with Structured Interstitial Water.

Yang Yang1,2, Chin Yi Chen3, Da Peng Liu2

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

The Journal of Physical Chemistry. B
|September 15, 2020
PubMed
Summary
This summary is machine-generated.

Researchers created novel self-assembled vesicles, MCsome, using metal carbonyl compounds. Structured interstitial water plays a key role in vesicle integrity and swelling, enabling new water-mediated functions in aqueous assemblies.

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Physical chemistry

Background:

  • Vesicles are crucial in biological systems and materials science.
  • Understanding the role of solvent in self-assembled structures is vital.
  • Metal carbonyl compounds offer unique assembly possibilities.

Purpose of the Study:

  • To report the self-assembly of novel metal carbonyl-based vesicles (MCsome).
  • To investigate the role of interstitial water structure in vesicle properties.
  • To explore water-mediated functions in aqueous assemblies.

Main Methods:

  • Synthesis of metal carbonyl compounds with varying R groups (C3Bithiophene, C6Pyrene, C6).
  • Characterization of self-assembled MCsome vesicle structures.
  • Analysis of interstitial water structure and hydrogen bonding.
  • Investigation of vesicle membrane integrity and swelling behavior.

Main Results:

  • Successfully assembled MCsome vesicles with structured interstitial water (tetrahedral order).
  • Demonstrated that interstitial water's hydrogen bonding strength varies with R group hydrophobicity.
  • Established water's critical role in maintaining vesicle membrane integrity and controlling swelling.
  • Observed water-mediated functions within the aqueous assemblies.

Conclusions:

  • Self-assembled MCsome vesicles exhibit unique structural properties influenced by interstitial water.
  • The structure and hydrogen bonding of interstitial water are key determinants of vesicle integrity and swelling.
  • This work introduces novel concepts for designing aqueous assemblies with water-mediated functionalities.