A heptapeptide was found to have an amino acid composition of asp. leu, lys, met

Question

A heptapeptide was found to have an amino acid composition of asp. leu, lys, met, phe and tyr.

Trypsin has no effect on the heptapeptide.

One cycle of Edman degradation renders the product whose structure is shown below.

Chymotrypsin treatment yields a dipeptide and a tetrapeptide, as well as a free amino acid.

The tetrapeptide is known to contain asp, leu, lys, and met.

Cyanogen bromide treatment generates a dipeptide that is determined to originate from the N-terminus of the heptapeptide, a tetrapeptide, and free lys.

The peptide sequence in single letter amino code is ____________.

Explanation / Answer

Phe-Asp-Tyr-Met-Leu-Met-Lys

In single letter amino acid peptide sequence is FDYMLMK

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