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Plant Physiology 75:658-661 (1984)
© 1984 American Society of Plant Biologists

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Resolution and Reconstitution of Mg-Protoporphyrin IX Monomethyl Ester (Oxidative) Cyclase, the Enzyme System Responsible for the Formation of the Chlorophyll Isocyclic Ring 1

Yum-Shing Wong and Paul A. Castelfranco

Department of Botany, University of California, Davis, California 95616

Mg-protoporphyrin IX monomethyl ester (oxidative) cyclase, the system responsible for the formation of the chlorophyll isocyclic ring in developing cucumber (Cucumis sativus L. cv Beit Alpha) chloroplasts, was resolved into two enzymic components: a high-speed supernatant and a membrane pellet. This reconstituted enzyme system required reduced pyridine nucleotide for activity.

1 Supported by National Science Foundation Grant PCM 81-08538.




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Copyright © 1984 by the American Society of Plant Biologists