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
What do you expect the charge of this protein will be at pH 2?