Methionine
 
Abbreviations: Met, M
Properties
Class: Polar, sulfur-containintl  
pK(COO-):  2.28
pK(NH3+): 9.21
pK(R): 
pI: 5.74
MW: 149 D 
Occurence in Proteins: 1.7% 
 
 
 
Characteristics
 
 high occurence in alpha-helices