Lecture 5 - Lecture 5 Introduction Protein functions...

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Lecture 5 Introduction: Protein functions Enzymes (catalysts) Transporters (membrane spanning) Nutrient storage (C,N sources) Structure (tensile strength) Contraction, motion Defense (antibodies, venoms) Regulation (of catalysis, transport, motion) Other (luminescence, bonding. ..) Amino acids (Proteins are linear polymers of amino acids) Basic unit of protein structure, with diverse characteristics Amphoteric, amphiprotic: act as acid or base Ionic: electrolyte Ampholyte: amphoteric electrolyte (in a pH gradient under an electric field, moves to its isoelectric point) Note: α -carbon; α –carboxylic acid (pK a ~2-3); α -amine (pK a ~ 9-10) (neutral form is the zwitterion) H R CO 2 - H 3 N + C H R CO 2 - H 2 N C H R CO 2 H H 3 N + C pH 2-3 pH 9-10
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Note chirality: L form Peptide bond involves amino and carboxylate groups Side chains (R groups): group amino acids by structure and function (Assignment: memorize amino acids by name, side chain, abbreviation, characteristic)
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This note was uploaded on 09/29/2010 for the course VEN 101C 91861 taught by Professor Davidsmart during the Spring '09 term at UC Davis.

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Lecture 5 - Lecture 5 Introduction Protein functions...

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