BIOL 2021 Chapter Notes - Chapter 2.4: Prenylation, Cell Membrane, Sphingolipid
2 Apr 2018
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Lateral diffusion: can switch positions within the same layer. Flexion of tails: tails can move together or apart. Flip-flop: moving from one side of the membrane to the other: doesn"t occur very often because it required energy. , unsaturated (shorter) chains are created to become more fluid: ex :antarctic fish will have a lot of unsaturated fatty acids to compensate for the cold. Some organisms such as bacteria adjust fatty acid composition to maintain fluidity at different temperatures. Tween lipids: makes it less deformable and more impermeable to small, water soluble molecules. Lipid composition is different in different organisms and organelles because membranes vary in function. In archaea, lipids usually contain prenyl chains instead of fatty acids: large amounts of cholesterol, contains a mixture of different phospholipids. E. coli has no cholesterol: few phospholipids, no glycolipids. Plasma membrane: has lots of cholesterol, sphingolipids, and ptd cho. Mitochondria: has little cholesterol and no sphingolipids.
