91
3.3. NON-POLAR(HYDROPHOBIC)R-GROUPS
Valine
VAL
V
Alanine
ALA
A
H
Leucine
LEU
L
H
NH3+
-OOC
H
NH3+
-OOC
CH3
Isoleucine
ILE
I
HC
H
NH3+
-OOC
CH3
CH2
CH3
HC
HC
CH3
Phenylalanine
PHE
F
H
NH2+ -OOC
H2C
H
NH3+
-OOC
CH2
C
H2
Methionine
MET
M
H
NH3+
CH2
CH3
Tryptophan
TRP
W
H
-OOC
CH3
CH2
CH3
Proline
PRO
P
NH3+
-OOC
NH3+
-OOC
CH2
CH2
C
CH2
CH
S
N
H
CH3
Figure 3.3.1. Amino acids with non-polar R-groups
3.4. POLAR(HYDROPHILIC)R-GROUPS
Serine
SER
S
Glycine
GLY
G
H
-OOC
Threonine
THR
T
H
NH3
+
H
-OOC
NH3
H
+
CH2
HC
NH3
O
CH2
SH
H
NH3+
-OOC
CH2
NH3+
-OOC
Glutamine
GLN
Q
H
+
OH
CH3
Asparagine
ASN
N
H
-OOC
H
NH3+
-OOC
OH
Tyrosine
TYR
Y
Cysteine
CYS
C
NH3+
-OOC
CH2
CH2
C
CH2
NH2
C
O
NH2
OH
Figure 3.4.1. Amino acids with polar (but non-charged) Rgroups
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