Cysteine
 
Abbreviations: Cys, C
Properties
Class: Polar, sulfur-containing
pK(COO-):  1.96
pK(NH3+): 8.18
pK(R): 10.28
pI: 5.07
MW: 121 D
Occurence in Proteins: 2.8%

 
 

Characteristics
 
 Disulfide linkages