Amino Acids, U C Davis, BIS102, C. Gasser

 

U. C. Davis, Biological Sciences

Amino Acid Structure/Function

Sulfur-containing 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

Sulfur Containing AA

Charged AA

C, M

D, E, H, K, R

Amino Acid

pKa's2

Pro Structure3

Chemical Structure4

3-D Structure5

S

u

l

f

u

r
Cysteine, Cys, C
Sulfur analog of Ser
weak charge
forms disulfide bonds
not hydrophilic (0.17)
 
Molec. Wt. = 103
Mole % = 2.8

N=8.18

C=1.96

R=10.28

 

pI=5.07

a =0.66

ß =1.40

t =0.54

Methionine, Met, M
initiator of proteins
no charge
hydrophobic (1.1)
 
Molec. Wt. =131
Mole % = 1.7

N=9.21

C=2.28

 

pI=5.74

a =1.30

ß =1.14

t =0.52

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  • 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.

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