Chapter 15.ppt - Chapter 15 Biomolecules Amino Acids Peptides and Proteins Suggested Problems 22,24,29,32-3,445,47 Proteins \u2013 Amides from Amino Acids

Chapter 15.ppt - Chapter 15 Biomolecules Amino Acids...

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Chapter 15 Biomolecules: Amino Acids, Peptides, and Proteins Suggested Problems: 22,24,29,32-3,44- 5,47
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Amino acids contain a basic amino group and an acidic carboxyl group Joined as amides between the –NH 2 of one amino acid and the –CO 2 H of the next amino acid Chains with fewer than 50 units are called peptides Protein : larger chains that have structural or catalytic functions in biology Proteins – Amides from Amino Acids
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In neutral solution, the —COOH is ionized and the — NH 2 is protonated The resulting structures have “+” and “–” charges (a dipolar ion , or zwitterion ) They are internal salts and resemble ionic salts in solution 26.1 Structures of Amino Acids
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Amino acids are amphiprotic Can react with either acids or bases React with Acid or Base
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20 amino acids form amides in proteins All are -amino acids - the amino and carboxyl are connected to the same C They differ by the other substituent attached to the carbon, called the side chain, with H as the fourth substituent Proline is a five-membered secondary amine, with N and the C part of a five-membered ring Other side chains may be acidic, basic, or neutral The Common Amino Acids
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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 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 Abbreviations and Codes
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The 20 Common Amino Acids in Proteins
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The 20 Common Amino Acids in Proteins
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The 20 Common Amino Acids in Proteins
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The 20 Common Amino Acids in Proteins
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Neutral: Fifteen of the twenty have neutral side chains
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