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Plant Physiology 81:12-16 (1986)
© 1986 American Society of Plant Biologists

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Distribution of Pyrophosphate:Fructose 6-Phosphate Phosphotransferase in Maize Leaves 1

Nicholas J. Kruger2, Sean M. Hemmingsen and David T. Dennis

Biology Department, Queen's University, Kingston, Ontario, Canada K7L 3N6

In leaves of maize (Zea mays) the activity of pyrophosphate:fructose 6-phosphate 1-phosphotransferase (PFP) is much less than that of ATP:fructose 6-phosphate 1-phosphotransferase. A sequential extraction technique was used to study the location of PFP in this tissue. When compared with enzymes known to be restricted to specific locations in maize, the distribution of PFP activity in the sequential extracts indicated that PFP is located predominantly, if not exclusively, in the mesophyll cytoplasm. Although confined to the same site as sucrose synthesis, the level of PFP activity is inadequate to contribute significantly to the gluconeogenic flux from fructose 1,6-bisphosphate to fructose 6-phosphate. The absence of PFP activity from the bundle-sheath demonstrates that this activity is not essential for glycolysis in higher plants.

2 Present address: Biochemistry Department, Rothamsted Experimental Station, Harpenden, Herts, AL5 2JQ, U.K.

1 Supported by the Natural Sciences and Engineering Research Council of Canada.






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Copyright © 1986 by the American Society of Plant Biologists