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 seq…

Question

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 :

Accepted Answer

Correct answer: 4. 4 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.

$A tetrapeptide has -COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with - N H_{2} group attached to a chiral center is :$

Solution

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