Serine
 
Abbreviations: Ser, S 
Properties
Class: Polar, alcohol  
pK(COO-):  2.21 
pK(NH3+): 9.15
pK(R): 13.60
pI: 5.68
MW: 105 D 
Occurence in Proteins: 7.1% 
 
 
 
Characteristics
 
 high occurence in beta bend