Biochemistry 4th Edition by Reginald Garrett, Charles Grisham

Exercise 3

Amino acid analysis of another heptapeptide gave Asp

(

is released by acid hydrolysis of N and/or Q amides.)

c. Brief chymotrypsin treatment yielded several products, including a dipeptide and a tetrapeptide. The amino acid composition of the tetrapeptide was Glx, Leu, Lvs, and Met.
d. Cyanogen bromide treatment yielded a tetrapeptide that had a net positive charge at pH 7 and a tripeptide that had a zero net charge at pH 7.
What is the amino acid sequence of this heptapeptide