Evidence for two uptake systems in Rhizobium leguminosarum for hydroxy-aromatic compounds metabolized by the 3-oxoadipate pathway |
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Authors: | C M Wong M J Dilworth A R Glenn |
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Institution: | (1) Nitrogen Fixation Research Group, School of Biological and Environmental Sciences, Murdoch University, 6150 Murdoch, Western Australia, Australia |
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Abstract: | Rhizobium leguminosarum biovar viciae and Rhizobium leguminosarum biovar trifolii have separate uptake systems for 4-hydroxybenzoate and protocatechuate. The 4-hydroxybenzoate uptake system (pobP) is inhibited by a range of compounds with substitution at the 4-position on the aromatic ring whereas the uptake system for protocatechuate (pcaP) is markedly inhibited only by other dihydroxybenzoic acids. The rate of 4-hydroxybenzoate uptake is very low in Rhizobium leguminosarum and Rhizobium trifolii grown on protocatechuate but mutants defective in 4-hydroxybenzoate uptake transport protocatechuate at rates similar to the wild-type grown under similar conditions. |
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Keywords: | Rhizobium leguminosarum Aromatic metabolism Aromatic uptake |
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