Lecture3_26 - 3/26/2010 Chapter 20 Cysteine: the only...

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3/26/2010 1 Chapter 20 Cysteine: the only standard amino acid with a sulfhydryl group ( SH group). The sulfhydryl group imparts cysteine a chemical property unique among the standard amino acids. Cysteine in the presence of mild oxidizing agents dimerizes to form a cysteine molecule. Cysteine - two cysteine residues linked via a covalent disulfide bond.
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3/26/2010 2 Under proper conditions, amino acids can bond together to produce an unbranched chain of amino acids. The length of the amino acid chain can vary from a few amino acids to many amino acids. Such a chain of covalently-linked amino acids is called a peptide. The covalent bonds between amino acids in a peptide are called peptide bonds. In a peptide bond, the carboxyl group of one amino acid reacts with the amino group on another amino acid to form an amide bond. In the process water is given off.
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3/26/2010 3 Every peptide has an N-terminal end and a C-terminal end + H 3 N-aa-aa-aa-aa-aa-aa-aa-aa-aa-COO - + H 3 N CH C CH 3 O H N CH C CH 2 O H N CH C CH 2 O - O OH Alanine Phenylalanine Serine C-terminal end N-terminal end Amino Acid Residues Ala-Phe-Ser Peptides that contain the same amino acids but
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Lecture3_26 - 3/26/2010 Chapter 20 Cysteine: the only...

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