Biochemistry 4th Edition by Christopher Mathews,Kensal van Holde, Dean Appling, Spencer Anthony Cahill

Exercise 7

Note that some of these problems refer to information presented in the Tools of Biochemistry 5A-D.
A mutant form of polypeptide hormone angiotensin II has the amino acid composition
The following observations are made:
Trypsin yields a dipeptide containing Asp and Arg, and a hexa-peptide with all the rest.
• Cyanogen bromide cleavage yields a dipeptide containing Phe and Pro, and a hexapeptide containing all the others.
• Chymotrypsin cleaves the hormone into two tetrapeptides, of composition
• The dipeptide of composition (Pro, Phe) cannot be cleaved by either chymotrypsin or carboxypeptidase.
What is the sequence of angiotensin II