Be sure to answer all parts. Give the amino acid sequence of an octapeptide that

Question

Be sure to answer all parts.

Give the amino acid sequence of an octapeptide that contains the amino acids Cys, Ile (2 equiv)
, Lys, Met, Ser, His, Tyr, and forms the following fragments when partially hydrolyzed with HCl: SerTyrMetCys, LysIleHis, and HisIleSerTyr. Be sure to answer all parts.

Give the amino acid sequence of an octapeptide that contains the amino acids Cys, Ile (2 equiv)
, Lys, Met, Ser, His, Tyr, and forms the following fragments when partially hydrolyzed with HCl: SerTyrMetCys, LysIleHis, and HisIleSerTyr.

Explanation / Answer

SerTyrMetCys

LysIleHis

HisIleSerTyr.

You have to start by looking for overlapping amino acids

LysIleHis

HisIleSerTyr. In these two the His amino acid is same . Hence we get

LysIleHisIleSerTyr

Now we look at the first sequence and see that it has Ser-Tyr which matches with the end of the sequence we just formed. Hence you join them

LysIleHisIleSerTyrMetCys

This is the octapeptide that you want

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