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Dolbier HW Solutions 679 - 773 AMINO ACIDS PEPTIDES AND...

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A-4. The carboxypeptidase-catalyzed hydrolysis of a pentapeptide yielded phenylalanine (Phe). One cycle of an Edman degradation gave a derivative of leucine (Leu). Partial hydrolysis yielded the fragments Leu-Val-Gly and Gly-Ala among others. Deduce the structure of the peptide. A-5. Consider the following compound: ( a ) What kind of peptide does this structure represent? (For example, dipeptide) ( b ) How many peptide bonds are present? ( c ) Give the name for the N-terminal amino acid. ( d ) Give the name for the C-terminal amino acid. ( e ) Using three-letter abbreviations, write the sequence. A-6. Consider the tetrapeptide Ala-Gly-Phe-Leu. What are the products obtained from each of the following? Be sure to account for all the amino acids of the peptide. ( a ) Treatment with 1- fl uoro-2,4-dinitrobenzene followed by hydrolysis in concentrated HCl at 100 ° C. ( b ) Treatment with chymotrypsin. ( c ) Treatment with carboxypeptidase ( d ) Reaction with benzyloxycarbonyl chloride PART B B-1. Which phrase correctly completes the statement? Except for glycine, which is achiral, all the amino acids present in proteins
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