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Chapter 19 Amino Acids and Proteins

Chapter 19 Amino Acids and Proteins. 19.3 Formation of Peptides. The Peptide Bond. A peptide bond is an amide bond forms between the carboxyl group of one amino acid and the amino group of the next amino acid contains an N (free H 3 N + ) terminal written on the left

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Chapter 19 Amino Acids and Proteins

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  1. Chapter 19 Amino Acids and Proteins 19.3Formation of Peptides

  2. The Peptide Bond A peptide bond • is an amide bond • forms between the carboxyl group of one amino acid and the amino group of the next amino acid • contains an N (free H3N+) terminal written on the left • contains a C (free COO–) terminal written on the right

  3. Formation of a Dipeptide

  4. Naming Dipeptides A dipeptideis named with • a yl ending for the N-terminal (free H3N+) amino acid • the full amino acid name of the free carboxyl group (COO–) at the C-terminal end

  5. Learning Check Draw the condensed structural formula, and give the name and abbreviation for the dipeptide Ser-Thr.

  6. Solution

  7. Learning Check Write the names and three-letter abbreviations of the tripeptides that could form from two glycines and one alanine.

  8. Solution Write the names and three-letter abbreviations of the tripeptides that could form from two glycines and one alanine. Glycylglycylalanine Gly-Gly-Ala Glycylalanylglycine Gly-Ala-Gly Alanylglycylglycine Ala-Gly-Gly

  9. Learning Check What are the possible tripeptides formed from one each of leucine, glycine, and alanine?

  10. Solution What are the possible tripeptides formed from one each of leucine, glycine, and alanine? Leu-Gly-Ala Leu-Ala-Gly Ala-Leu-Gly Ala-Gly-Leu Gly-Ala-Leu Gly-Leu-Ala

  11. Learning Check Write the name and three-letter abbreviation for the following tetrapeptide:

  12. Solution Ala-Leu-Cys-Met Alanylleucylcysteylmethionine

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