Lect9+Protein - Protein •  What are Proteins?...

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Unformatted text preview: 10/1/10 Protein •  What are Proteins? •  Func4ons of Protein •  Protein diges4on •  How much do we need? •  What are the consequences of too much or too li=le? What are proteins? •  contain C, H, O & Nitrogen •  long chains of amino acids 9 Essen4al amino acids 11 Non ­essen4al amino acids Synthesis of Protein •  Carbohydrates: made by enzymes •  Lipids: made by enzymes •  Protein: sequence of amino acids coded for in DNA 1 10/1/10 Forma4on of Dipep4de Protein Structure Shape is Important 2 10/1/10 Func4ons of Protein 1. Building Material: –  Growth: structural proteins •  E.g. ac4n/myosin, collagen, kera4n Func4ons of Protein 2. Enzymes: sucrase, amylase, lipase, ATPase 3.  Hormones: Insulin, glucagon, gastrin, CCK –  Con4nual Repair +Turnover • Lymphocytes 1 day • Intestinal cells 3-5 days • Cornea 7 days • Skin 13- 120 days • Red blood cells 120 days • Brain, heart many years 4. Sa4ety  ­ Nutrients from dead cells are recycled 5. Transport Proteins 6. Fluid Balance Inadequate protein in blood leads to edema, i.e., Fluid leaks from blood vessels. Also, Proteins for lipid transport 3 10/1/10 7. Immune Func4on •  An4bodies  ­ bind to an4gens & inac4vate them (an4gens: proteins, bacteria, viruses)  ­ derived from Lymphocytes 8. Energy Source: 4 kcal/g 1.  Glucose is low or 2.  Excess protein eaten •  White blood cells: macrophages –  Destroy an4gens by phagocytosis Fate of excess Nitrogen Urea synthesis in liver Excre4on of Urea in urine 4 ...
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This note was uploaded on 03/29/2011 for the course NUTRISCI 10 taught by Professor Benodelumen during the Spring '10 term at Berkeley.

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