Related Experiment Video
Updated: Jul 10, 2026
07:31
Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
Published on: September 1, 2023
Molecular dynamics simulations and membrane protein structure quality.
Anthony Ivetac1, Mark S P Sansom
1Department of Biochemistry, University of Oxford, South Parks Road, Oxford, UK.
European Biophysics Journal : EBJ
|October 26, 2007
Summary
Molecular dynamics (MD) simulations can assess membrane protein structure quality. MD simulations revealed significant structural deformations in a bacterial ABC transporter model, highlighting its utility for quality control in membrane protein structural biology.
Area of Science:
- Structural Biology
- Computational Biology
- Biophysics
Background:
- Assessing the global quality of membrane protein folds is challenging due to low resolution and crystallization artifacts.
- Homology models of human membrane proteins often require quality assessment, especially when based on distant bacterial homologs.
Purpose of the Study:
- To evaluate the utility of molecular dynamics (MD) simulations for assessing the quality of membrane protein structures and models.
- To test MD simulation methods using a known problematic model of the bacterial ABC transporter MsbA.
Main Methods:
- Performed 20 ns MD simulations of two bacterial ABC transporters, MsbA (model) and BtuCD (known stable structure), in a lipid bilayer.
- Conducted comparative analyses of structural integrity and conformational stability between the two simulations.
Main Results:
- The MsbA model exhibited dramatic structural deformations during the MD simulation.
- The BtuCD structure demonstrated good conformational stability under identical simulation conditions.
- Significant differences in structural integrity were observed between the MsbA and BtuCD simulations.
Conclusions:
- MD simulations are a valuable tool for quality control in membrane protein structural biology.
- MD can effectively explore the global conformational stability of membrane protein folds and models.
More Related Videos
Related Concept Videos
01:24Protein 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...
01:23Membrane Fluidity
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.Fatty acids tails of phospholipids can be either saturated or...
01:26Membrane Fluidity
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...