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Sillero A & Maldonado A, 2006
Sillero & Maldonado report a complete set of pK values in there paper on isoelectric point calculation using the oscillating method (1). The pK values are reported as the "pK value of each acid-base residue present in a protein."
Amino acid pK values from Sillero A & Maldonado A, 2006 (1).
Group
pK   
CT
3.2
 
ASP
4.0
 
GLU
4.5
 
HIS
6.4
 
NT
8.2
 
CYS
9.0
 
TYR
10.0
 
LYS
10.4
 
ARG
12.0
 
†  Data from Table 1.
References
(1)  Sillero A & Maldonado A (2006) Isoelectric point determination of proteins and other macromolecules: oscillating method. Comp Biol Med 36:157-66.