Download Structure Name Abbreviation Polarity pKa side chain Phenylalanine

Structure
HO 2C
Abbreviation
Phe, F
Tryptophan
Trp, W
Tyrosine
Tyr, Y
Alanine
Ala, A
Isoleucine
Ile, I
Leucine
Leu, L
Non-Polar
(‘hydrophobic’)
Methionine
Met, M
Non-Polar
(‘hydrophobic’)
Proline
Pro, P
Non-Polar
(‘hydrophobic’)
Valine
Val, V
Non-Polar
(‘hydrophobic’)
Asparagine
Asn, N
Hydrophilic,
uncharged
Glutamine
Gln, Q
Hydrophilic,
uncharged
Serine
Ser, S
Hydrophilic,
uncharged
Threonine
Thr, T
Hydrophilic,
uncharged
Histidine
His, H
6.04
Lysine
Lys, K
Hydrophilic,
basic
Aromatic
Hydrophilic,
basic
Arginine
Arg, R
Hydrophilic,
basic
12.48
Cysteine
Cys, C
Hydrophilic,
acidic
8.33
Aspartic Acid
Asp, D
3.86
Glutamic Acid
Glu, E
Hydrophilic,
acidic
Hydrophilic,
acidic
Glycine
Gly, G
NH2
NH
HO 2C
NH2
OH
HO 2C
Name
Phenylalanine
NH2
HO 2C
HO 2C
HO 2C
NH2
NH2
NH2
NH
HO 2C
HO 2C
HO 2C
NH2
CONH2
NH2
CONH2
HO 2C
HO 2C
HO 2C
NH2
OH
NH2
OH
NH2
NH
N
HO 2C
NH2
NH2
HO 2C
NH2
H
N
HO 2C
NH2
NH2
NH2
SH
HO 2C
NH2
CO2H
HO 2C
pKa side chain
Non-Polar
(‘hydrophobic’)
Aromatic
Non-Polar
(‘hydrophobic’)
Non-Polar
(‘hydrophobic’)
10.07
NH2
S
HO 2C
Polarity
Non-Polar
(‘hydrophobic’)
Aromatic
Non-Polar
(‘hydrophobic’)
Aromatic
NH2
CO2H
HO 2C
NH2
HO 2C
NH2
10.79
4.25
Acid-Base Titration of Amino Acids
Asparagine
14
12
10
pH
pK a = 8.84
8
6
pI = 5.43
4
pK a = 2.02
2
0
0
0.5
1
1.5
2
2.5
3
2.5
3
2.5
3
Equivalents OH- Added
Glutamic Acid
14
12
pK a = 9.67
10
pH
8
6
pK a = 4.25
4
pI = 3.22
pK a = 2.19
2
0
0
0.5
1
1.5
2
Equivalents OH- Added
Lysine
14
12
pK a = 10.79
pI = 9.87
10
pH
pKa = 8.95
8
6
4
pK a = 2.18
2
0
0
0.5
1
1.5
2
Equivalents OH- Added