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PLANT PHYSIOLOGY , Vol 105, Issue 2 593-600, Copyright © 1994 by American Society of Plant Biologists
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METABOLISM AND ENZYMOLOGY |
Purification and Characterization of Chloroplastic NADP-Isocitrate Dehydrogenase from Mixotrophic Tobacco Cells (Comparison with the Cytosolic Isoenzyme)
S. Galvez, E. Bismuth, C. Sarda and P. Gadal
Physiologie Vegetale Moleculaire, Unite de Recherche Associee au Centre National de la Recherche Scientifique 1128, Bat 430, Universite Paris-Sud, 91405-Orsay Cedex, France
Green, mixotrophic tobacco (Nicotiana tabacum) cell cultures in the
exponential growth phase were found to have two clearly distinguishable
NADP-isocitrate dehydrogenase (ICDH; EC 1.1.1.42) isoenzymes. Their elution
behavior during anion-exchange column chromatography was similar to that
described previously for the cytosolic (ICDH1) and chloroplastic (ICDH2)
enzymes from pea (Pisum sativum) leaves. ICDH2 was absent in etiolated
tobacco cell suspensions and appeared during the greening process. Both
isoforms were purified to apparent electrophoretic homogeneity by ammonium
sulfate fractionation and anion-exchange and affinity chromatography. The
isoenzymes were separated on a DEAE-Sephacel column, but the most effective
step was a Matrex Red-A column, which enabled an overall purification of
833- and 1328-fold for ICDH1 and ICDH2, respectively. Polyclonal antibodies
were raised against each isoform. The ICDH2-specific antibody was used to
localize tobacco leaf ICDH2 in situ by an immunogold labeling technique.
The enzyme was found largely, if not exclusively, in the chloroplasts of
green leaves. ICDH1 and ICDH2 were shown to have apparent native molecular
weights of 117,000 and 136,000, respectively, and to consist of identical,
48.5-kD subunits. Similar apparent Km values for NADP, D(+)isocitrate, and
Mg2+ were found for the two enzymes when assayed with Mg2+ as the metal
cofactor.
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