THE PROTEINS AND THEIR METABOLISM 



95 



Number of ammo acids 



10 

 11 



12 

 13 

 14 

 15 

 16 

 IT 

 18 

 19 

 20 



Number of possible compounds 



3,628,800 



39,916,800 



479,001,600 



6,227,020,800 



87,178,291,200 



1,307.674,368,000 



20,922^789,888,000 



355,687,428,096,000 



6,402,373,705,728,000 



121,645,100,408,832,000 



2,432,902,008,176,640,000 



If it were possible to arrange twenty amino acids in one straight line 

 forming a protein molecule, 2,432,902,008,176,640,000 different kinds 

 of protein molecules could be formed. This figure, however, does not 

 yet by any means complete the list. While most of the amino acids are 

 able to form unions with other amino acids in a straight line, the dibasic 

 mono-amino acids and the diamino acids are able to form branched chain 

 compounds. 



COOH 



I 



CH 2 



I 



I 

 CHN 



\H 



COOH 



Aspartic 

 acid 



H\ 



N CH 



COOH 



CH 2 

 H\| 

 NCH 



COOH 



Glycocoll 



Alanin 

 Aspartic acid 



CO 



HN CH COOH 



CO, 



COOH 

 CH 2 



HNCH 



I 

 COOH 



