A tetrapeptide has – COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with – NH 2 group attached to a chiral center is
Text Solution
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(4)
Because – COOH group of tetrapeptide is intact on alanine, its NH2 must be participating in condensation.
Alanine is at one terminus, – – – A.
To fill the 3 blanks, possible options are:
When NH 2 group attached to non chiral carbon
(ii) When NH 2 group attached to chiral carbon
where, Glycine (G)
Valine (V)
Phenyl alanine (P)
Alanine
So the number of possible sequence are 4.
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