BIOSYNTHESIS 



259 



ribose-1-P 



ATP 



PP -* 



nicotinamide 



nicotinamide 

 riboside 



nicotinamide 

 ribotide 



*-DPN 



ATP 



ADP 



ATP- 



FiG. 76— Biosynthesis of DPN. 



-riboflavin 



ADP-<- 



-»-FMN- 



FAD-<- 



Fig. 77 — Biosynthesis of FAD. 



-ATP 



-»-PP 



pantothenic acid- 



cysteine- 



ATP 



PP-^ 



pantothenylcysteine 



CO, 



pantetheine 



-phosphopantetheine 



ATP 



>^ADP 



— >- dephospho — CoA 

 (pantetheine — PO4 ~ PO4 — R — adenine) 



ATP 



CoA 



ADP 



Fig. 78 — Biosynthesis of coenzyme. A 



