A polypeptide gave the following proportions of amino acids upon hydrolysis: ala (1), gly (1), ile (2), phe (2), ser (1), tyr (2). Edman degradation yields tyrosine phenylthiohydantoin. Partial hydrolysis of the peptide gave a mixture of smaller peptides including: ala-gly, gly-tyr, ile-ile, phe-ile, ser-phe, tyr-ser, tyr-phe, ile-ala. Which is the C-terminal amino acid in the original peptide?

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The Answer of A polypeptide gave the following proportions of amino acids upon hydrolysis: ala (1), gly (1), ile (2), phe (2), ser (1), tyr (2). Edman degradation yields tyrosine phenylthiohydantoin. Partial hydrolysis of the peptide gave a mixture of smaller peptides including: ala-gly, gly-tyr, ile-ile, phe-ile, ser-phe, tyr-ser, tyr-phe, ile-ala. Which is the C-terminal amino acid in the original peptide?

A Polypeptide Gave the Following Proportions of Amino Acids Upon