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Control of Photosynthetic Sucrose Synthesis by Fructose 2,6-Bisphosphate: III. Properties of the Cytosolic Fructose 1,6-Bisphosphatase

Bernd Herzog, Mark Stitt and Hans W. Heldt
Plant Physiology
Vol. 75, No. 3 (Jul., 1984), pp. 561-565
Stable URL: http://www.jstor.org/stable/4268723
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Control of Photosynthetic Sucrose Synthesis by Fructose 2,6-Bisphosphate: III. Properties of the Cytosolic Fructose 1,6-Bisphosphatase
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Abstract

The cytosolic fructose 1,6-bisphosphatase from spinach (Spinacia oleracea U.S. hybrid 424) leaves has been partially purified and its response to fructose 2,6-bisphosphate, AMP, and fructose 1,6-bisphosphate studied, using concentrations present in the cytosol during photosynthesis. In the presence of fructose 2,6-bisphosphate, the substrate saturation kinetics for fructose 1,6-bisphosphate are sigmoidal, with half-maximal activity being attained in 0.1 to 1 millimolar concentration range. The inhibition is enhanced by AMP. Using these results, and information published elsewhere on metabolite concentrations, it is discussed how fructose 1,6-bisphosphatase activity will vary in vivo in response to alterations in the availability of triose phosphate and AMP, and the accumulation of the product, fructose 6-phosphate.

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