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. 1982 Jan;69(1):112-6.
doi: 10.1104/pp.69.1.112.

Effects of Iron and Oxygen on Chlorophyll Biosynthesis : II. OBSERVATIONS ON THE BIOSYNTHETIC PATHWAY IN ISOLATED ETIOCHLOROPLASTS

B M Chereskin  1 , P A Castelfranco
Affiliations

Effects of Iron and Oxygen on Chlorophyll Biosynthesis : II. OBSERVATIONS ON THE BIOSYNTHETIC PATHWAY IN ISOLATED ETIOCHLOROPLASTS

B M Chereskin et al. Plant Physiol. 1982 Jan.

Abstract

The conversion of l-glutamate to delta-aminolevulinate, in preparations of cucumber etiochloroplasts incubated in vitro, was inhibited by protoheme IX and Mg-protoporphyrin IX. Mg-protoporphyrin IX was destroyed in the presence of air and plastids; this breakdown was accelerated by S-adenosyl methionine. Mg-protoporphyrin IX was also converted to protochlorophyllide in vitro. This conversion exhibited an absolute requirement for atmospheric oxygen and was strongly stimulated by S-adenosyl methionine and by darkness.Based on these results, and on the results of the preceding paper (Spiller, Castelfranco, Castelfranco 1981 Plant Physiol 68: 107-111), a comprehensive hypothesis for the role of O(2) and Fe in chlorophyll biosynthesis is formulated.

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References

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