Plant Physiology 71:849-854 (1983)
© 1983 American Society of Plant Biologists
Articles
Hydrogenation of Geranylgeraniol 1
Two Pathways Exist in Spinach Chloroplasts
Jürgen Soll,
Gernot Schultz,
Wolfhart Rüdiger and
Jürgen Benz
Institut für Tierernährung, Tierärztliche Hochschule Hannover 3000 Hannover, Federal Republic of Germany,
Botanisches Institut der Universität München 8000 München 19, Federal Republic of Germany
The reduction of geranylgeranylpyrophosphate to phytylpyrophosphate in spinach chloroplasts is described for the first time. The reductase is localized in the chloroplast envelope. By contrast, the reduction of the geranylgeranyl moiety in Chl synthesis is catalyzed in the thylakoids (via Chl synthetase). NADPH functions as electron donor in both reactions. Chl synthetase is firmly bound to the thylakoid membranes, and very little activity is found in the stroma fraction. Chl synthetase in chloroplasts can use the pyrophosphate ester of either phytol, geranylgeraniol, or farnesol, phytylpyrophosphate being the preferred substrate. Exogenous Chlide exhibits no influence on Chl synthesis by chloroplast subfractions.
1 This work was aided by grants from the Deutsche Forschungsgemeinschaft.
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