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Topic 2 - lipid bilayer (lec 3)

G sphingomyelin sphingosine backbone hydrophilic head

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Unformatted text preview: e Hydrophilic head group: phosphate + choline 1 fatty acid Absent from plants, bacteria Hydrophobic interactions phosphate glycerol sphingosine fatty acid non-polar choline phosphate fatty acid choline polar fatty acid BIO 1140 – SLIDE 9 > The second experiment, this technique is commonly used to asess how mobile a membrane consituant is. It is a technique called FRAP ( Fluorescence Recovery After Photobleaching). > So what happens is that u take a cell and u label membrane components of intrest with the fluoresent marker. These could be proteins or lipids. Than u direct a strong, highly focused laser at part of the cell and u bleach the fluoresents. You over expose it to light, so that it becomes bleached. Next u look to see how quickly fluoresence reappear. > If the component that u labeled is mobile, than it will quickly move into the bleach area, and the fluresence will come back. If it is not mobile, than that bleached spot will remaine. Fig. 7-11 Becker et al. 2009 Nonpolar The lipid bilayer Gorter and Grendel, 1925 Key component of permeability barrier Composition I if Mobile it will recover,If not mobile it will stay low > What makes up the lipid bilayer? The back bone of the membrane is a lipid bilayer. The membrane is made up of two layers of lipid. This lipid bilayer becomes the structural basis of the membrane. There are Three types of lipids that are found in it. 1) Phospholipids: The bluck of the membrane is made up of phospholipids. And there are two main kinds of phospholipids. phosphoglycerides and Sphingolipids phosphoglycerides: This is the larger component. They are built on a glycerol backbone, glycerol is a three carbon molecule, to two of those carbons are attachd fatty acid chains. Fatty acids are hydrocabon chains, if every carbon is filled up with the maximum # of hydrogens, they are called saturated, and u have a series of singal bond. If in some cases u see double bonds, than it is said to be unsaturated fatty acid. This is imporatnt in a membrane context b/c s...
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