Properties of Magnesium Chelatase in Greening Etioplasts
- 1 February 1981
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 67 (2), 246-249
- https://doi.org/10.1104/pp.67.2.246
Abstract
Evidence was obtained by 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 [Cucumis sativa cv. Beit Alpha] cotyledons. Under experimental conditions which were optimized for Mg2+ chelation Zn2+ chelation was not detected. 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 for its regulatory function.Keywords
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