Lecture3 - Lecture 3 9/27/11 Assignment: Segel Page 93:...

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Lecture 3 9/27/11 Assignment: Segel Page 93: Problems 48 and 49 Memorize structures and one letter codes of the 20 amino acids. Outline: Common amino acids found in proteins (continued): ± Amino acids with nonpolar aliphatic R groups. ± Amino acids with aromatic R groups. ± Amino acids with positively charged R groups. ± Amino acids with negatively charged R groups. ± Isoelectric point. ± Nonprotein amino acids. ± Chemical reactivity of amino acids.
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± Amino acids with nonpolar aliphatic R groups Val V Ala A Gly G Met M Leu L Ile I
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Proline Proline is the only amino acid that is a secondary amine. Its R group is bonded to both the α -carbon atom and to the nitrogen. Pro P The ring structure of proline makes it more conformationally restricted than the other amino acids. It thus has big influence on the architecture of proteins.
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± Amino acids with polar uncharged R groups Both of these amino acids have OH groups in their R groups. Thr
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This note was uploaded on 01/15/2012 for the course BIS 102 taught by Professor Hilt during the Fall '08 term at UC Davis.

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Lecture3 - Lecture 3 9/27/11 Assignment: Segel Page 93:...

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