BIOL 4087 Chapter : Amino Acids 2
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Consider the peptide:
NH2-GAPAGPAGTGKTETTKDLAKSMALLCWFNCS-COOH
Table I. pK values of some amino acids
| amino acid | pK of side chain or terminal group |
|---|---|
| Alanine (Ala or A) | uncharged |
| Arginine (Arg or R) | 12.5 |
| Asparagine (Asn or N) | uncharged |
| Aspartic acid (Asp or D) | 3.9 |
| Cysteine (Cys or C) | 8.3 |
| Glutamic acid (Glu or E) | 4.3 |
| Glycine (Gly or G) | uncharged |
| Histidine (His or H) | 6.0 |
| Leucine (Leu or L) | uncharged |
| Lysine (Lys or K) | 10.8 |
| Phenylalanine (Phe or F) | uncharged |
| Serine (Ser or S) | uncharged |
| Tryptophan (Trp or W) | uncharged |
| Tyrosine (Tyr or Y) | 10.9 |
| Valine (Val or V) | uncharged |
| peptide N terminus | 7.8 |
| peptide C terminus | 3.6 |
Using Table I above, determine the net charge of the peptide at pH9.
(the answer is not -1 or 1)