U. C. Davis, Biological Sciences

Amino Acid Structure/Function

Aromatic 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

r

o

m

a

t

i

c

 
Phenylalanine, Phe, F
no charge
absorbs UV
hydrophobic (2.5)
 
Molec. Wt. = 147
Mole % = 3.5

N=9.13

C=1.83

 

pI=5.48

a =1.16

ß =1.33

t =0.59

Tyrosine, Tyr, Y
weak charge
absorbs UV
hydrogen bonding
not hydrophilic (0.08)
 
Molec. Wt. = 163
Mole % = 3.5

N=9.11

C=2.20

R=10.07

 

pI=5.66

a =0.74

ß =1.45

t =0.76

Tryptophan, Trp, W
largest amino acid
rarest amino acid
no charge
absorbs UV
hydrogen bonding
hydrophobic (1.5)
 
Molec. Wt. = 186
Mole % = 1.1

N=9.39

C=2.38

 

pI=5.89

a =1.02

ß =1.35

t =0.65

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Copyright© Charles S. Gasser 2010