chapter08

chapter08 - BCH 4053 Summer 2001 Chapter 8 Lecture Notes...

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Chapter 8, Page 1 BCH 4053 Summer 2001 Chapter 8 Lecture Notes Slide 1 Chapter 8 Lipids Slide 2 Functions of Lipids • Energy Storage • Thermal Insulation • Structural Components of Membranes • Protective Coatings of Plants and Insects • Hormonal Regulation • Chemical Signaling of Various Kinds • Enzymatic Cofactors • Electron Carriers Slide 3 Structural Nature of Lipids • Most diverse class • Based on solubility rather than a single structural feature • Soluble in organic solvents • Poorly soluble or insoluble in water • Forming aggregate structures in water • Amphipathic structure—major part of molecule is non-polar Proteins, polysaccharides, and nucleic acids are polymers classified according to their building blocks. Lipids as a classification is based upon solubility characteristics which can come from a variety of structural features.
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Chapter 8, Page 2 Slide 4 Non-Polar Residues of Lipids • Fatty Acid Chains • Sphingolipid Chains • Isoprenoid Chains • Sterols Slide 5 Fatty Acids • Saturated fatty acids • Alkyl chain with carboxyl group in position 1 • Unsaturated fatty acids • One (monounsaturated) or more (polyunsaturated) double bonds in the chain • Double bonds usually have cis configuration • See Figure 8.1 for some typical structures • Some 3-D structures are shown under “External links, Chapter 8” Slide 6 Fatty Acid Nomenclature • Saturated Fatty Acids • (Systematic Name, Symbol, Common Name) COOH Hexadecanoic Acid (C 16:0) (Palmitic Acid) CO OH Octadecanoic Acid (C18:0) (Stearic Acid) CO OH Eicosanoic Acid (C 2 0:0 ) (Arachidic Acid)
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Chapter 8, Page 3 Slide 7 Fatty Acid Nomenclature, con’t. • Unsaturated Fatty Acids COOH 9-Octadecenoic Acid (9-C 18 :1 ) (Oleic Acid ) 10 9 omega-9 COOH omega-6 13 12 10 9 9,12-Ο ctadecadienoic Acid (9,12-C 18:2 ) (Linoleic Acid) COO H 15 14 12 11 9 8 6 5 5,8,11,14- Eicosatetraenoic Acid (5,8,11,14-C20:4) (Arachidonic Acid) omega-6 Slide 8 Fatty Acid Nomenclature, con’t. • Learn Names and Structures from Table 8.1 • Omega nomenclature is intended to show biosynthetic relationship between fatty acids.
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chapter08 - BCH 4053 Summer 2001 Chapter 8 Lecture Notes...

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