Question

The amino acid sequence of minke whale myoglobin has recently been determined. A partial sequence is...

The amino acid sequence of minke whale myoglobin has recently been determined. A partial sequence is given below. What is the net charge on this peptide at pH 4.0, 7.0, and 10.0?

Phe-Lys-His-Leu-Lys-Thr-Glu-Ala-Glu-Met-Lys-Ala-Ser-Glu-Asp

The answers are: +2.5 at pH 4, -1 at pH 7, and -2.3 at pH 10. How do you get these answers?

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Answer #1

The answers are: +2.5 at pH 4, -1 at pH 7, and -2.3 at pH 10 can be calculated by using the below formula:

The net charge Z of a peptide at a certain pH can be estimated by calculating

where Ni are the number, and pKai the pKa values, of the N-terminus and the side chains of Arginine, Lysine, and Histidine. The j-index pertain to the C-terminus and the Aspartic Acid, Glutamic Acid, Cysteine, Tyrosine amino acids.

Innovagen's Peptide Property Calculator calculates the net charge for all pH values of 0.1 to 14 in increments of 0.1, and plots these producing a titration curve.

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