Abstract
Growth of Klebsiella pneumoniae M5a1 on 3-hydroxybenzoate leads to the induction of 3-hydroxybenzoate monooxygenase, 2,5-dihydroxybenzoate dioxygenase, maleylpyruvate isomerase and fumaryl-pyruvate hydrolase. Growth in the presence of 2,5-dihydroxybenzoate also induces all of these enzymes including the 3-hydroxybenzoate monooxygenase which is not required for 2,5-dihydroxybenzoate catabolism. Mutants defective in 3-hydroxybenzoate monooxygenase fail to grow on 3-hydroxybenzoate but grow normally on 2,5-dihydroxybenzoate. Mutants lacking maleylpyruvate isomerase fail to grow on 3-hydroxybenzoate and 2,5-dihydroxybenzoate. Both kinds of mutants grow normally on 3,4-dihydroxybenzoate. Mutants defective in maleylpyruvate isomerase accumulate maleylpyruvate when exposed to 3-hydroxybenzoate and growth is inhibited. Secondary mutants that have additionally lost 3-hydroxybenzoate monooxygenase are no longer inhibited by the presence of 3-hydroxybenzoate. The 3-hydroxybenzoate monooxygenase gene (mhbM) and the maleylpyruvate isomerase gene (mhbI) are 100% co-transducible by P1 phage.
MeSH Terms
Chromatography, Ion Exchange
Gentisates/metabolism
Hydroxybenzoates/metabolism
Isomerases/genetics,metabolism
Klebsiella pneumoniae/enzymology,genetics,growth & development,metabolism
Mixed Function Oxygenases/genetics,metabolism
Mutation
Oxidation-Reduction
Transduction, Genetic
cis-trans-Isomerases
Chemicals
Gentisates
Hydroxybenzoates
3-hydroxybenzoic acid
protocatechuic acid
Mixed Function Oxygenases
3-hydroxybenzoate-4-monooxygenase
Isomerases
cis-trans-Isomerases
maleylpyruvate isomerase
2,5-dihydroxybenzoic acid
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Jones D C
Department of Biochemistry, University of Leicester, UK.
Cooper R A
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