U. C. Davis, Biological Sciences

Amino Acid Structure/Function

Aliphatic 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

A

l

i

p

h

a

t

i

c

 

Glycine, Gly, G
smallest amino acid
no charge
not hydrophilic (0.67)1
 
Molec. Wt. = 57
Mole % = 7.5

N=9.60

C=2.35

 

pI=5.97

a =0.43

ß =0.58

t =1.77

Alanine, Ala, A
like glycine
no charge
hydrophobic (1.0)
 
Molec. Wt. = 71
Mole % = 9.0

N=9.69

C=2.34

 

pI=6.01

a =1.41

ß =0.72

t =0.82

Valine, Val, V
no charge
hydrophobic (2.3)
 
Molec. Wt. = 99
Mole % = 6.9

N=9.62

C=2.32

 

pI=5.97

a =0.90

ß =1.87

t =0.41

Leucine, Leu, L
no charge
isomer of isoleucine
hydrophobic (2.2)
 
Molec. Wt. = 113
Mole % = 7.5

N=9.60

C=2.36

 

pI=5.98

a =1.34

ß =1.22

t =0.57

Isoleucine, Ile, I
no charge
isomer of leucine
hydrophobic (3.1)
 
Molec. Wt. = 113
Mole % = 4.6

N=9.68

C=2.36

 

pI=6.02

a =1.09

ß =1.67

t =0.47

Proline, Pro, P
no charge
promotes turns
not hydrophobic (-0.29)
 
Molec. Wt. = 97
Mole % = 4.6

N=10.96

C=1.99

 

pI=6.48

a =0.34

ß =0.31

t =1.32

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Copyright© Charles S. Gasser 2010