Lecture34-2007 - Fatty Acids: Long alkyl chains with...

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1 Fatty Acid Breakdown I Lecture 34 Chapter 19-1 and 2 Office hours today: 11 am to noon Fatty Acids: Long alkyl chains with carboxylic acid at one end. General forumula: CH 3 -(CH 2 ) n -COO - (number from carboxylate) Stearic acid: saturated C18 18:0 Oleic acid: unsaturated C18 18:1 ! 9 (all natural double bonds are cis!) Linoleic acid: C18, two unsaturations 18:2 ! 9 ! 12 Linolenic acid: C18, three unsaturations 18:3 ! 9 ! 12 ! 15 " # $ % Alternative numbering Cis and Trans Fatty Acids
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2 Functions of Fatty Acids in Mammals • Membrane components: – Building blocks for phospholipids, glycolipids. • Post-translational modification of proteins. – Causes protein to associate with membranes. • Serve as hormones and second messengers – Prostaglandins are derived from Arachidonic acid • Fuel molecules Fatty acids are stored as triacylglycerol (trigyceride): Triglycerides are stored in specialized cells: Adipocytes Fat droplet
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3 Importance of fat in metabolism: Highly reduced energy source. More kJ/mole than any other biomolecule. Virtually anhydrous, so takes up very little space (relative to carbohydrates or proteins). Energy stores in average adult: – Fat: 420,000 kJ – Protein: 100,000 kJ – Glycogen: 2,500 kJ – Free glucose: 170 kJ Glycogen/glucose: sufficient for ~24 hours. Fat: sufficient for several weeks. Problems with fat:
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This note was uploaded on 04/09/2008 for the course BIOCHEMIST 361 taught by Professor Haltiwanger during the Fall '08 term at SUNY Stony Brook.

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Lecture34-2007 - Fatty Acids: Long alkyl chains with...

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