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Pls explain the steps on why it came to be because I have a hard understanding this lesson T - T You have isolated from a rare fungus an octapeptide that prevents baldness and you wish to determine its amino acid sequence. The amino acid composition is K2, D, Y, F, G, S, A. Reaction of the intact peptide with dansyl chloride yields dansyl - A. Cleavage with trypsin yields peptides whose compositions are: (K, A, S) and (G, F, K) plus a dipeptide. Reaction with chymotrypsin releases free D, a tetrapeptide with composition (k, S, F, A) and a tripeptide whose composition following acid hydrolysis is (G, K, Y). The enzymatic digests are each carried out on the whole, undansylated peptide. What is the sequence?

Pls explain the steps on why it came to be because I have a hard understanding this lesson T - T You have isolated from a rare fungus an octapeptide that prevents baldness and you wish to determine its amino acid sequence. The amino acid composition is K2, D, Y, F, G, S, A. Reaction of the intact peptide with dansyl chloride yields dansyl - A. Cleavage with trypsin yields peptides whose compositions are: (K, A, S) and (G, F, K) plus a dipeptide. Reaction with chymotrypsin releases free D, a tetrapeptide with composition (k, S, F, A) and a tripeptide whose composition following acid hydrolysis is (G, K, Y). The enzymatic digests are each carried out on the whole, undansylated peptide. What is the sequence?

Organic Chemistry
Organic Chemistry
9th Edition
ISBN:9781305080485
Author:John E. McMurry
Publisher:John E. McMurry
Chapter26: Biomolecules: Amino Acids, Peptides, And Proteins
Section26.SE: Something Extra
Problem 28MP
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Pls explain the steps on why it came to be because I have a hard understanding this lesson T - T You have isolated from a rare fungus an octapeptide that prevents baldness and you wish to determine its amino acid sequence. The amino acid composition is K2, D, Y, F, G, S, A. Reaction of the intact peptide with dansyl chloride yields dansyl - A. Cleavage with trypsin yields peptides whose compositions are: (K, A, S) and (G, F, K) plus a dipeptide. Reaction with chymotrypsin releases free D, a tetrapeptide with composition (k, S, F, A) and a tripeptide whose composition following acid hydrolysis is (G, K, Y). The enzymatic digests are each carried out on the whole, undansylated peptide. What is the sequence?
Transcribed Image Text:Pls explain the steps on why it came to be because I have a hard understanding this lesson T - T You have isolated from a rare fungus an octapeptide that prevents baldness and you wish to determine its amino acid sequence. The amino acid composition is K2, D, Y, F, G, S, A. Reaction of the intact peptide with dansyl chloride yields dansyl - A. Cleavage with trypsin yields peptides whose compositions are: (K, A, S) and (G, F, K) plus a dipeptide. Reaction with chymotrypsin releases free D, a tetrapeptide with composition (k, S, F, A) and a tripeptide whose composition following acid hydrolysis is (G, K, Y). The enzymatic digests are each carried out on the whole, undansylated peptide. What is the sequence?
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