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Amino Acid Physical Properties
Amino Acids
Code
Hydropathy
Charge
pKa
NH2
pKa
COOH
pK(R)
Solubility
Arginine
R
hydrophilic
+
9.09
2.18
13.2
71.8
Asparagine
N
hydrophilic
N
8.8
2.02
 
2.4
Aspartate
D
hydrophilic
-
9.6
1.88
3.65
0.42
Glutamate
E
hydrophilic
-
9.67
2.19
4.25
0.72
Glutamine
Q
hydrophilic
N
9.13
2.17
 
2.6
Lysine
K
hydrophilic
+
10.28
8.9
2.2
 
Serine
S
hydrophilic
N
9.15
2.21
 
36.2
Threonine
T
hydrophilic
N
9.12
2.15
 
freely
Cysteine
C
moderate
N
10.78
1.71
8.33
freely
Histidine
H
moderate
+
8.97
1.78
6
4.19
Methionine
M
moderate
N
9.21
2.28
 
5.14
Alanine
A
hydrophobic
N
9.87
2.35
 
15.8
Valine
V
hydrophobic
N
9.72
2.29
 
5.6
Glycine
G
hydrophobic
N
9.6
2.34
 
22.5
Isoleucine
I
hydrophobic
N
9.76
2.32
 
3.36
Leucine
L
hydrophobic
N
9.6
2.36
 
2.37
Phenylalanine
F
hydrophobic