C. RIMINGTON 



\ 



A PA 



\N/ / 

 H / 



/\ 

 _CH_ 



A PA 



PA 



PA 



\N/ 



— CH= 



H 



/ 



r 



xz 



\ 



\ 





\N/ 



H a 



PA A 



H 



A^ PA 



= \ N / 



a + a 

 A PA/ 



PA 



a+b 

 A PA/ 

 A 



PA 



/ 



PA 



/ 



b + b 

 A PA/ 

 PA 



PA 



PA 



/ 



/PA A /PA A 



Uroporphyrin I Uroporphyrin HI 



Figure 3. Scheme for the biosynthetic production of porphyrin 



isomers* 



/ PA A 



Uroporphyrin II 



H U C 5 



H 



H 



OCH, 



H 3 C\ N /" 

 H 



\ N /H 



XZ 



ffl X 



Figure 4. Prodigiosin 



.CH 2 CHCOOH 0= /\__CH 2 -COCOOH 



> 



\y\/ 



NH 



NH q 



o=j 



NH 



HOOC-HoC CH,COCOOH 



HOOCH 2 C\/H 

 NH 



Figure 5. Suggested origin of pyrrole units 1 



246 



