Mn 2+ and Co 2+ toxicity in chlorophyll biosynthesis

Abstract
The metal ion-induced inhibition of tetrapyrrole biosynthesis was studied in the cyanobacterium Anacystis nidulans. The accumulation of protoporphyrin and Mg protoporphyrin due to the effect of Co2+ and Mn2+ treatment, respectively, pointed to 2 different sites of inhibition.