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Liver porphyrinogen carboxylyase in hexachlorobenzene porphyric rats. Studies with intermediate porphyrinogens of series III and with uroporphyrinogen I
Authors
M.C. Rios de Molina del
L.C. San Martin de Viale
R. Wainstok de Calmanovici
Publication date
1 January 1987
Publisher
Abstract
1. 1. The present work studies the action of hexachlorobenzene (HCB) on the decarboxylation of uroporphyrinogen (Urogen) I and III and also on the decarboxylation of intermediate porphyrinogens of series III under different conditions using liver of normal and porphyric rats as enzyme source. 2. 2. The same enzyme is involved in the Urogen decarboxylation of both isomeric series I and III and catalyses the four steps in both cases. HCB affects all of them. 3. 3. HCB blocks the four steps of Urogen III decarboxylation to the same degree, as a function of intoxication time. 4. 4. HCB leads, in general, to an increase in the efficiency (Km/Vmax) of the porphyric system. These data can be interpreted as a reaction of the organism to overcome the enzymatic blockade. © 1987.Fil:Rios de Molina del, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:Wainstok de Calmanovici, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.Fil:San Martin de Viale, L.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
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Last time updated on 15/05/2024