Problem

Determine the amino acid sequence of a polypeptide from the following data:Acid hydrolysis...

Determine the amino acid sequence of a polypeptide from the following data:

Acid hydrolysis gives Ala, Arg, His, 2 Lys, Leu, 2 Met, Ser, Thr, Val.

Carboxypeptidase A releases Val.

Edman’s reagent releases PTH-Leu.

Cleavage with cyanogen bromide gives three peptides with the following amino acid compositions:

1. His, Lys, Met

2. Thr, Val

3. Ala, Arg, Leu, Lys, Met, Ser

Trypsin-catalyzed hydrolysis gives three peptides and a single amino acid:

4. Arg, Leu, Ser

5. Met, Thr, Val

6. Lys

7. Ala, His, Lys, Met

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