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

Amino Acid Structure/Function
Polar Unharged 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

P

o

l

a

r

/

U

n

c

h

a

r

g

e

d

Serine, Ser, S
no charge
hydrogen bonding
hydrophilic (-1.1)
 
Molec. Wt. = 87
Mole % = 7.1

N=9.15

C=2.21

 

pI=5.68

a =0.57

ß =0.96

t =1.22

Threonine, Thr, T
no charge
hydrogen bonding
hydrophilic (-0.75)
 
Molec. Wt. =101
Mole % = 6.0

N=9.62

C=2.11

 

pI=5.87

a =0.76

ß =1.17

t =0.90

Asparagine, Asn, N
amide of Asp
hydrogen bonding
no charge
hydrophilic (-2.7)
 
Molec. Wt. =114
Mole % = 4.4

N=8.08

C=2.02

 

pI=5.41

a =0.76

ß =0.48

t =1.34

Glutamine, Gln, Q
amide of Glu
hydrogen bonding
no charge
hydrophilic (-2.9)
 
Molec. Wt. = 128
Mole % = 3.9

N=9.13

C=2.17

 

pI=5.65

a =1.27

ß =0.98

t =0.84

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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