Catabolism of 3- and 4-hydroxyphenylacetic acid by Klebsiella pneumoniae

Authors:
  • JFJ. Fernandez
    J. Fernandez
  • EFE. Ferrer
    E. Ferrer
  • AGA. Garrido-Pertierra
    A. Garrido-Pertierra
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Abstract
Klebsiella pneumoniae catabolizes both 4-hydroxyphenylacetic acid and 3-hydroxyphenylacetic acid via meta-cleavage of 3,4-dihydroxyphenylacetic acid, ultimately yielding pyruvate and succinate. The organism can synthesize two hydroxylases catalysing 3,4-dihydroxyphenylacetic acid formation, which differ in substrate specificity, cofactor requirement, kinetics and regulation. Five enzymes sequentially involved in the catabolism of 3,4-dihydroxyphenylacetic acid are encoded on a 7 kbp fragment of the K. pneumoniae chromosome that has been isolated in a recombinant plasmid.