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Hexokinases of Tobacco Leaves: Changes in the Cytosolic and Non-Cytosolic Isozyme Complexes Induced by Tobacco Mosaic Virus Infection

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Biologia Plantarum

Abstract

Changes in the cytosotic (soluble) and the non-cytosolic (particulate) isozyme composition of hexokinases and in their properties were studied by ion exchange chromatography on DEAE cellulose after the subcellular fractionation both in the healthy and the tobacco mosaic virus (TMV) infected tobacco leaves. Three main isozyme complexes were obtained: one particulate fraction (the particulate hexokinase phosphorylating both glucose and fructose, EC 2.7.1.1), and two soluble fractions (the soluble hexokinase phosphorylating both the glucose and the fructose, and the soluble fructokinase, which phosphorylates primarily fructose, EC 2.7.1.4). The total fructokinase activities were nearly twice higher than the total glucokinase activities (188.6 % of glucokinase activity in healthy plants and 181.3 % in infected plants). The total particulate glucokinase activity was increased to 120.6 % and the fructokinase to 118.9 % in TMV infected tissue when compared with healthy control. The similar pattern of activity was observed for soluble hexokinase isozymes - the sum of soluble glucokinase activity was increased to 175.4 % and of fructokinase activity to 131.2 % in TMV infected tissue. The isozymes isolated both from the healthy control and TMV-infected leaves had the similar elution profiles, displayed Michaelis-Menten kinetics, showed the identical profiles of pH optima and were Mg2+ dependent with the highest enzyme activity at equimolar Mg2+ and ATP concentration.

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  1. Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Na Karlovce 1a, CZ-16000, Prague 6, Czech Republic

    L. Šindelář & M. Šindelářová

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  1. L. Šindelář
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  2. M. Šindelářová
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Šindelář, L., Šindelářová, M. Hexokinases of Tobacco Leaves: Changes in the Cytosolic and Non-Cytosolic Isozyme Complexes Induced by Tobacco Mosaic Virus Infection. Biologia Plantarum 47, 413–419 (2003). https://doi.org/10.1023/B:BIOP.0000023885.99970.30

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  • DOI: https://doi.org/10.1023/B:BIOP.0000023885.99970.30

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