Nutri Sci Lecture 8 - Lecture 8: Proteins What are Proteins...

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Lecture 8: Proteins What are Proteins Long chains of amino acids R group side chain Biosynthesis of Macronutrients Proteins: synthesized from amino acid based on sequence coded for in DNA many important molecules are proteins: enzymes (drives metabolic rxn), hormones, muscles Carbohydrates: made by enzymes Lipids: made by enzymes Protein Formation Transcription –> Processing (splicing etc.) → translation by ribosomes → protein Formation of peptide bond: amine groups combine when water is released Hierarchy of Protein Structures Primary—single strand Secondary Tertiary Quaternary Protein shape: changes in primary structure of hemoglobin affects shape of red blood cells Functions of Protein 1. Building Material Growth: structural proteins eg: actin/myosin (muscle), collagen, keratin Continual Repair + turnover lymphocytes --- 1 day Intestinal cells ---- 3-5 days Cornea --- 7 days Red blood cells ---120 days Brain, heart ---- many years Nutrients from dead cells are recycled 2. Enzymes (catalyst for reactions) “ase” --- sucr ase , lact ase , amyl ase , lipase, ATPase, protease, lactate dehydrogenase 3. Hormones can be proteins or peptides (short chain, < 30 AA)
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This note was uploaded on 11/02/2011 for the course NST 10 taught by Professor Amy during the Spring '08 term at University of California, Berkeley.

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Nutri Sci Lecture 8 - Lecture 8: Proteins What are Proteins...

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