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Lecture3_19 - Chapter 19 All cells are surrounded by a...

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3/18/2010 1 Chapter 19 All cells are surrounded by a membrane that confines their contents. Up to 80% of the mass of a cell membrane can be lipid materials and these lipid materials are dominated by phospholipids. A phospholipid contains one or more fatty acids, a phosphate group, a platform molecule to which the fatty acid(s) and the phosphate group are attached, and an alcohol that is attached to the phosphate group.
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3/18/2010 2 A glycerophospholipid is a lipid that contains two fatty acids and a phosphate group esterified to a glycerol molecule and an alcohol esterified to the phosphate group. Ester Linkage Glycerophospholipids undergo hydrolysis and saponification reactions in a manner similar to that for triacylglycerols. The alcohol attached to the phosphate group in a glycophospholipid is usually one of three amino alcohols: choline, ethanolamine, or serine
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3/18/2010 3 Structurally glycerophospholipids are similar to triacylglycerols; they have different biochemical functions.
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