Inhibition of aconitase and fumarase by nitrogen compounds in Rhodobacter capsulatus |
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Authors: | Luque-Romero M Martinez Castillo F |
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Institution: | (1) Departamento de Bioquímica y Biología Molecular y Fisiología, Facultad de Ciencias, E-14071 Córdoba, Spain |
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Abstract: | High levels of aconitase and fumarase activities were found in Rhodobacter capsulatus E1F1 cells cultured with nitrate as the sole nitrogen source either under light-anaerobic or dark-aerobic conditions. Both activities were strongly and reversibly inhibited in vitro by nitrite or nitric oxide, whereas nitrate or hydroxylamine showed a lower effect. Other enzymes of the tricarboxylic acids cycle such as malate dehydrogenase or isocitrate dehydrogenase were not affected by these nitrogen compounds. When growing on nitrate in the dark R. capsulatus E1F1 cells accumulated nitrite intracellularly, so that an in vivo inhibition of aconitase and fumarase could account for the strong inhibition of growth observed in the presence of nitrite under dark-aerobic conditions.Abbreviations ACO
aconitase
- FUM
fumarase
- MDH
malate dehydrogenase
- ICDH
isocitrate dehydrogenase
- TCA
tricarboxylic acid |
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Keywords: | Nitrate photoassimilation Nitrite Fumarase Aconitase Rhodobacter capsulatus |
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