1. Before the advent of the Edman degradation, the primary structures of proteins were elucidated through the use of partial acid hydrolysis. The resulting oligomers were separated and their amino acid compositions were determined. Consider a polypeptide with amino acid composition ( 2Ala, Asp, Cys, Leu, Lys, Phe, Pro, 2Ser, 2Trp). Treatment with carboxypeptidase A released only Leu. Oligopeptides with the following compositions were obtained by partial acid hydrolysis.
(Ala,Lys) (Ala, 2Ser) (Cys, Leu)
(Ala, Lys, Trp) (Ala, Trp) (Cys, Leu,Pro)
(Ala, Pro) (Asp, Lys, Phe) (Phe, Ser, Trp)
(Ala, Pro, Ser) (Asp, Phe) (Ser, Trp) (2Ser,Trp)
Determine the amino acid sequence from this data.