Amino Acid

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

• For a view any protein whose structure is known go to Molecules R Us, a wonderful web site set up by the National Institutes of Health.
• For a really cool periodic table which includes biochemical functions of elements go to the WebElements page at the University of Sheffield.