Lipid Structures and Lipid-Protein Interactions in Thylakoid Membranes
Biological membranes are essentially lipoprotein structures and, in general, are described in terms of the fluid mosaic model. In this current view of biomembrane structure, the lipid component forms a closed, stable bilayer while in a fluid liquid-crystalline condition. It thereby provides a regulated and controlled internal environment as well as a matrix for the lateral diffusion of membrane proteins. Such a model implies that any enzyme residing in the bilayer must have lipid associated with the protein surface. Most biomembranes contain a large number of integral proteins and clearly the fraction of lipid involved at protein/lipid interfaces will be higher as the protein to lipid ratio of the membrane as a whole increases. Lipid-protein associations occur in all membrane systems and at the molecular level any interactions, whether hydrophobic, steric or electrostatic, must be governed by common principles.
KeywordsThylakoid Membrane Lipid Mixture Total Polar Lipid Soybean Phospholipid Hexagonal Type
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