92 



A. I. KINGER 



In this reaction two glycocoll molecules are allowed to interact. The 

 basic amino radical of II unites with the acid carboxyl radical of I, giving 

 rise to the glycyl-glycin peptid III. This compound, while larger and more 

 complex than the original glycocoll, still possesses one free NH 2 and one 

 free COOH at either end, which again makes it capable of uniting with 

 other amino acids at either end or with other peptids. 



B 



III 



H 



H 



CH, N 



! \ 



H 



CO N CH 2 



/ I 

 H COOH 



CH 2 N 



I \ 



H 



4- HOOC 



Glycyl-glycin -\- Glycocoll 



IV 



H 



CH N 00 



CH 2 



CO 



CH, 



/ I 

 H COOH 



Glycyl-glycyl-glycin 



H 

 H 



C 



III 



CH 



CO - - N CH 2 



/ I 

 H COOH 



Glycyl-glycin 



III 



HOOC CH, 



OC CH 2 



Glycyl-glycin 



H 

 H 



H 



CH, N OC CH, 



H 



CO - N CH 2 N< 



OC CH 2 



H COOH 



Tetra-glycyl-glycin 



H 

 H 



