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 :
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Sol. Following combinations are possible for tetrapeptide
Val — Phe — Gly — Ala
Val — Gly — Phe — Ala
Phe — Gly — Val — Ala
Phe — Val — Gly — Ala
1. In all above sequences C-terminal is alanine
2. Glycine is optically inactive amino acid, hence It should not be N-terminal so, only above combination are possible.
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