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Related Concept Videos

Fluid Mosaic Model01:19

Fluid Mosaic Model

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 with the analogy of...
Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

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 G-protein-linked receptors (GPCRs) and...
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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...
Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

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...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...

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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

Molecular simulation approaches to membrane proteins.

Phillip J Stansfeld1, Mark S P Sansom

  • 1Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK.

Structure (London, England : 1993)
|November 15, 2011
PubMed
Summary
This summary is machine-generated.

Molecular simulations advance the study of membrane proteins by enabling analysis of complex cellular processes. This review highlights progress in using these simulations to link protein structure to function.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Computational Biophysics

Background:

  • Membrane proteins are crucial for cellular functions, including transport and signaling.
  • Understanding membrane protein structure-function relationships is key to deciphering cellular mechanisms.
  • Advances in computational power and simulation techniques are revolutionizing the field.

Purpose of the Study:

  • To review the progress and applications of molecular simulations in understanding membrane proteins.
  • To elucidate the relationship between membrane protein structure and function using simulation data.
  • To discuss how simulations aid in studying complex cellular boundary processes.

Main Methods:

  • Utilizing molecular dynamics (MD) simulations.
  • Analyzing large multimeric protein complexes.
  • Integrating simulation data with experimental structural information.

Main Results:

  • Simulations now achieve physiologically relevant timescales.
  • Large-scale membrane protein complexes can be effectively simulated.
  • Simulations provide insights into solute transport, ligand-channel interactions, and channel gating.

Conclusions:

  • Molecular simulations are indispensable for dissecting membrane protein function.
  • The synergy between simulation advancements and structural data accelerates discoveries.
  • Simulations offer a powerful approach to investigate cellular signaling and transport mechanisms.