U. C. Davis, Biological Sciences
Molecular and Cellular Biology

Amino Acid Structure/Function
Charged Amino Acids


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Aliphatic AA

Aromatic AA

Polar but Uncharged AA

G, A, V, L, I, P

F, Y, W

S, T, N, Q

Suflur Containing AA

Charged AA

C, M

D, E, H, K, R

Amino Acid

pKa's2

Pro Structure3

Chemical Structure4

3-D Structure5

C

h

a

r

g

e

d

Aspartate, Asp, D
acidic
negative charge
hydrophilic (-3.0)
 
Molec. Wt. = 115
Mole % = 5.5

N=9.60

C=2.19

R=3.65

 

pI=2.77

a =0.99

ß =0.39

t =1.24

Glutamate, Glu, E
acidic
negative charge
hydrophilic (-2.6)
 
Molec. Wt. = 129
Mole % = 62

N=9.67

C=2.19

R=4.25

 

pI=3.22

a =1.59

ß =0.52

t =1.01

Histidine, His, H
imidizole in side chain
basic
reactive
weak positive charge
hydrophilic (-1.7)
 
Molec. Wt. = 137
Mole % = 2.1

N=9.17

C=1.82

R=6.00

a =1.05

ß =0.80

t =0.81

 

pI=7.59

Lysine, Lys, K
amine in side chain
basic
reactive
strong positive charge
hydrophilic (-4.6)
 
Molec. Wt. = 128
Mole % = 7.0

N=8.95

C=2.18

R=10.53

a =1.23

ß =0.69

t =1.07

 

pI=9.74

Arginine, Arg, R
guanidinium side chain
basic
strongest positive charge
hydrophilic (-7.5)
 
Molec. Wt. = 156
Mole % = 4.7

N=9.04

C=2.17

R=12.48

a =1.21

ß =0.84

t =0.90

 

pI=10.76

Back to Amino Acid Properties Page

The amino acids are, of course, the building blocks of proteins. You can see thousands of different protein structures at RCSB PDB , a grant-funded site that has essentially all known proteins structures that can now be viewed in JSmol!! Just search for a protein and you can find the structure. Jmol.

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