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Lesson 2 Outline_Protein - L ectur e 1 Chemistr y of F ood...

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Lecture 1: Chemistry of Food Proteins Lesson 2 1. Amino acids as building blocks of proteins Are organic polymers composed of amino acids as the basic units. Amino acids: a carboxylic acid group (-COOF) and an amino group (-NH2) 2. Essential amino acids There are 9 essential amino acids that our body’s cant synthesize in amounts to meet body’s needs 3. Protein structure: primary, secondary, tertiary, quaternary Amino acids join together in peptide bonds. The sequence of amino acids is known as the primary structure Secondary structure is the way in which different parts of the polypeptide chain link together. Tertiary structure folding of the protein into a 3-dimensional shape. Quaternary structure forms a larger functional unit by interactions between separate polypeptide chains. 4. Why is protein important? Growth and repair of cell and tissue. Mechanical work. Disease prevention. Controlling body processes (enzymes, hormones, buffers). Transport functions. Source of energy and glucose. 5. Test your knowledge: Match each term with the appropriate definition: 1. Primary structure A. helices and pleated sheets 2. Secondary structure B. sequence of amino acids in a protein
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