Biological Membranes

2 February 2017

Internal membranes for organelles Bilayer Permeability • Low permeability to charged and polar substances • Water is an exception: small size, lack of charge, and its high concentration • Shedding solvation shells for ions is very unlikelyCommon Features of Biological Membranes Sheet-like structure TWO-molecule thick (60-100A) Lipids, Proteins, and carbohydrates Lipids form the barrier.

Proteins mediate distinct functions.Non-covalent assemblies (self-assembly, protein-lipid interaction) Asymmetric (always) Fluid structures: 2-dimensional solution of oriented lipids and proteins Electrically polarized (inside negative ~-60mV) Spontaneously forming in water Protein/lipid ratio = 1/4 – 4/1 Carbohydrate moieties are always outside the cell Protein/Lipid ratio • Pure lipid: insulation (neuronal cells) • Other membranes: on average 50% • Energy transduction membranes (75%) Internal membranes of mitocondria and Each atom i at position ri, is treated as a point with a mass mi and a fixed charge qi. What is the Force Field? In molecular dynamics a molecule is described as a series of charged points (atoms) linked by springs (bonds). To describe the time evolution of bond lengths, bond angles and torsions, also the non-bonding van der Waals and elecrostatic interactions between atoms, one uses a force field. The force field is a collection of equations and associated constants designed to reproduce molecular geometry and selected properties of tested structures. Energy Terms Described in the CHARMm Force Field

Biological Membranes Essay Example

How to cite Biological Membranes essay

Choose cite format:
Biological Membranes. (2017, Feb 04). Retrieved April 16, 2021, from https://newyorkessays.com/essay-biological-membranes/
A limited
time offer!
Save Time On Research and Writing. Hire a Professional to Get Your 100% Plagiarism Free Paper