214 



AMINO ACIDS, PEPTIDES AND PROTEINS 



TABLE 4. DICAR BOXYLIC AMINO A CIDS 



Name 

 y-methylene glutamic acid 

 y- methylene glutamine 

 y-methyl glutamic acid 

 y-glutamyl ethylamide 

 a-amino adipic acid 

 Q-amino pimelic acid 



Structure 

 H02CC(=CH2)CH2CH(NH2)C02H 

 H2NOCC(=CH2)CH2CH(NH2)C02H 

 H02CCH(CH3)CH2CH(NH2)C02H 

 C2H5HNOC(CH2)2CH(NH2)C02H 

 H02C(CH2)3CH(NH2)C02H 

 H02C(CH2)4CH(NH2)C02H 



TABLE 5. SULFUR CONTAINING AMINO ACIDS 



Name 



S-methylcysteine 



Methyl methionine sulfonium 

 hydroxide 



Djenkolic acid 



S-methyl cysteine sulfoxide 



Allin 

 S-2-carboxyethyl-L-cysteine 



Cycloalliin 



Structure 

 CH3SCH2CH(NH2)C02H 

 [ (CH3)2S+(CH2)2CH(NH2)C02H]OH- 



H02CCH(NH2)CH2SCH2SCH2CH(NH2)C02H 



O 



CH3SCH2CH(NH2)C02H 



O 



II 

 H2C=CHCH2SCH2CH(NH2)C02H 



H02CCH2CH2SCH2CH(NH2)C02H 







tl 



s 



I I 



H,CHC CHCO^H 



N 

 H 



