- 2013/2014 - 3D Structures of Biological Macromolecules Exercise: Membrane Proteins. Jürgen Sühnel email@example.com. Leibniz Institute for Age Research, Fritz Lipmann Institute, Jena Centre for Bioinformatics Jena / Germany.
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3D Structuresof Biological Macromolecules
Exercise: Membrane Proteins
Leibniz Institute for Age Research, Fritz Lipmann Institute,
Jena / Germany
Supplementary Material: http://www.fli-leibniz.de/www_bioc/3D/
Without cholesterol, cell membranes would be too fluid, not firm enough, and too permeable to some molecules. In other words, it keeps the membrane from turning to mush.
Cholesterol is an amphipathic molecule, meaning, like phospholipids, it contains a hydrophilic and a hydrophobic portion. Cholesterol's hydroxyl (OH) group aligns with the phosphate heads of the phospholipids. The remaining portion of it tucks into the fatty acid portion of the membrane.
[Insulin receptor, rhodopsin, …]
[Enzymes: phospholipase …]
[G proteins …]
>sp|P16102|BACH_HALSA Halorhodopsin OS=Halobacterium salinarium (strain ATCC 700922)