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BCHE 395-4 2014 Amino Acids

Which one could form an h bond phe f tyr y trp

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Unformatted text preview: •  Hydrophilic •  Lysine Lys K ε- amino group (primary amine) (alanine with a propylamine subsQtuent on the β carbon) •  Arginine Arg R guanidino group •  HisQdine His H imidizol ring hep://www.biology.arizona.edu/biochemistry/ problem_sets/aa/aa.html HisQdine Can be in two forms in the cell Correct structure for a quiz! Ring = imidazol ring Gly G Need to know the 3- leeer and 1- leeer designaQon too! These are easy. So are ALL of these chiral? Met M thio- ether –CH2- S- CH3 Nonpolar R Groups •  Hydrophobic •  Glycine Gly G simplest, nonchiral center, –  But not aliphaNc (look up definiQon) •  •  •  •  •  Alanine Ala Valine Val Leucine Leu Isoleucine Ile Proline Pro –  Weird one A V L I P methyl group isopropyl group isobutyl group like leucine… 5 membered ring Proline •  No free rotaQon around N atom will affect its movement in protein chains •  Constraint! Which one could form an H- bond? Phe F Tyr Y Trp W These amino acid side chains absorb UV light at 270–280 nm AromaQc R Groups •  Phenylalanine Phe F ‘benzene’ ring –  Hydrophobic •  Tryptophan Trp W indole ring –  Hydrophobic •  Tyrosine Tyr Y phenyl ring + - OH –  ReacQve and ~hydrophilic Spectral Property of Proteins is due to the Absorbance of U.V. Lig...
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