chapter26

chapter26 - Chapter 26: Amino Acids, Peptides, and Proteins...

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Chapter 26: Amino Acids, Peptides, and Proteins
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Structures of Amino Acids In neutral solution, the COOH is ionized and the NH 2 is protonated The resulting structures have “+” and “-” charges (a dipolar ion , or zwitterion ) 2
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Proteins – Amides from Amino Acids Amino acids contain a basic amino group alpha to an acidic carboxyl group They are joined as amides between the NH 2 of one amino acid and the CO 2 H to the next amino acid Chains with fewer than 50 units are called peptides Protein: large chains that have structural or catalytic functions in biology 3
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The Common Amino Acids 20 amino acids form amides in proteins All are α -amino acids - the amino and carboxyl are connected to the same C They differ by the other substituent attached to the α carbon, called the side chain, with H as the fourth substituent 4
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Abbreviations and Codes Leucine L, Leu Lysine K, Lys Methionine M, Met Phenylalanine F, Phe Proline P, Pro Serine S, Ser Threonine T, Thr Tryptophan W, Trp Tyrosine Y, Tyr Valine V, Val 5 Alanine A, Ala Arginine R, Arg Asparagine N, Asn Aspartic acid D, Asp Cysteine C, Cys Glutamine Q, Gln Glutamic Acid E, Glu Glycine G, Gly Histidine H, His Isoleucine I, Ile
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chapter26 - Chapter 26: Amino Acids, Peptides, and Proteins...

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