Question

The complete structures of the IMQDK peptides?

confuse.To long structure..

Answer 1

The sequence is of the one letter codes of amino acids (which any serious student in science should know very well).

IMQDK translates to IleMetGlnAspLys, or to be more simple:

`"Isoleucine-Methionine-Glutamine-Aspartate-Lysine"`

To draw a peptide structure, merely draw in peptide bonds, and then draw the side chains in alternating fashion with the correct stereochemistry.

I drew this peptide at physiological pH (`~7.4`). If the question specifies a different pH, we'd have to consider what atoms would be deprotonated or protonated.

For instance, the amino terminus `"pK"_"a" approx 9.5`, so that `"pH" = 7.4`, it would keep its proton.