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image of Israel Journal of Plant Sciences

The presence of a physiological dark reduction mechanism of NADP+ in isolated heterocysts of Nostoc muscorum was investigated by testing reactions with substrates and enzymes of the oxidative pentose phosphate pathway and the Krebs cycle. Activities of dehydrogenases were 5–20 fold higher in the isolated heterocysts than in the vegetative cells, using glucose-6-P, fructose-6-P and isocitrate as substrates. Isocitrate dehydrogenase (IDH) tested in crude extracts was found to be very unstable, specific only to NADP+, and to have higher affinity for Mn+ than for Mg+2. The response of IDH from N. muscorum to known effectors and regulators was very different from the response of this enzyme from other sources—activity was not stimulated by AMP, ADP and glyoxylate, and the inhibition by ATP and αKG was relatively low.

Affiliations: 1: Department of Agricultural Botany, The Hebrew University of Jerusalem


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