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Plant Physiology 67:246-249 (1981)
© 1981 American Society of Plant Biologists

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Articles

Properties of Magnesium Chelatase in Greening Etioplasts

METAL ION SPECIFICITY AND EFFECT OF SUBSTRATE CONCENTRATIONS 1

Thomas P. Fuesler, Lawrence A. Wright, Jr.2 and Paul A. Castelfranco3

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

Evidence was obtained by means of low temperature spectrofluorimetry and high pressure liquid chromatography for the exclusive chelation of Mg2+ into protoporphyrin IX by a plastid preparation extracted from greening cucumber cotyledons. Under the experimental conditions which were optimized for Mg2+ chelation, Zn2+ chelation was not detected. However, Zn2+ chelation was observed when ATP was omitted and ZnCl2 was added to the incubation mixture. The observed Zn2+ chelation was partially nonenzymic. The requirements for the enzyme, Mg chelatase, are discussed in terms of the regulatory function of this enzyme.

2 Present address: Rod McLellan Co., South San Francisco, CA 94080.

3 To whom correspondence should be addressed.

1 This research was supported by National Science Foundation Grant PCM-78 13250.




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Copyright © 1981 by the American Society of Plant Biologists