An Octapeptide Is Subjected to Edman Degradation and It Is

question 21

Essay

An octapeptide is subjected to Edman degradation and it is discovered that the amino terminus is
Ser.Treatment of the remaining heptapeptide with BrCN yields a tripeptide
A and a tetrapeptide, B.
The tripeptide A is treated with trypsin, releasing a single residue and a dipeptide.The dipeptide,
on Edman degradation, gives two residues, one of which is not optically active.
The tetrapeptide B is also treated with trypsin, releasing a new tripeptide and a His residue.The
tripeptide from this step is treated with chymotrypsin, resulting in a dipeptide and a single amino
acid.Edman degradation of the dipeptide yields two residues, one of which is Val.
There is no Phe or Trp in the original octapeptide.
Provide a possible sequence of the original octapeptide.

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