Calculate the net charge

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A tripeptide HPK structure has been solved: the HPK side chains are not involved in any peptide linkages (thus, HPK only consists of normal Cα-linked peptide bonds). Ignore the D L configuration. Draw the tri-amino acid chemical structure at pH 13, and indicate (with arrow) the psi (ψ) angle of the peptide and the phi angle. Circle all ionizable groups and charges, and label all pKa values used to calculate the net charge.

Reference no: EM132440051

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