Plant Physiol.
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Plant Physiology 58:295-298 (1976)
© 1976 American Society of Plant Biologists

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In Vitro Activation of a Galactosyl Transferase Involved in the Osmotic Regulation of Ochromonas1

Heinrich Kauss and Hartmut Quader2

a University of Kaiserslautern, Department of Biology, Postfach 3049, 675 Kaiserslautern, Germany

Osmotic regulation in the flagellate Ochromonas malhamensis Pringsheim is mainly mediated by fluctuations in the pool size of {alpha}-galactosyl-(1->1)-glycerol (isofloridoside). A regulated key enzyme of isofloridoside metabolism is the galactosyl transferase producing isofloridoside phosphate. The activity of this enzyme in crude extracts can be increased 5- to 20-fold by incubation at pH 6. The activation occurs in a reaction with a Q10 of 1.5 to 3 and is dependent on time and pH value. Inactivation of the activated form of the enzyme is also time-dependent, and is minimal at the pH value at which activation is optimal. The data suggest a regulation of the enzyme by chemical modification due to the action of auxiliary enzymes.

2 Present address: MSU/ERDA Plant Research Laboratory, East Lansing, Mich. 48824.

1 This work was supported by the Deutsche Forschungsgemeinschaft.






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Copyright © 1976 by the American Society of Plant Biologists