Applied Microbiology and Biotechnology

, Volume 41, Issue 2, pp 250–256 | Cite as

Catechol ring-cleavage in Pseudomonas cepacia: the simultaneous induction of ortho and meta pathways

  • R. Y. Hamzah
  • B. S. Al-Baharna
Applied Microbial and Cell Physiology Original Paper


This work demonstrates the ring-cleavage pathways of catechol on Pseudomonas cepacia ATCC 29351, formed upon its growth on salicylate and benzoate, each as a sole carbon source. When grown on salicylate, P. cepacia induces only the catechol ortho pathway by its induction of catechol 1,2-dioxygenase. However, interestingly, benzoate-grown cells induce the ortho and meta pathways for the biodegradation of catechol, by inducing simultaneously catechol 1,2-dioxygenase and 2,3-dioxygenase, respectively, in the ratio of 7:1. The results indicate that P. cepacia ATCC 29351 possesses the genetic capacity for enzymes of both the ortho- and meta-cleavage pathways of benzoate degradation, although the phenotypic expression for the ortho pathway is higher. The simultaneous induction of catechol 1,2- and 2,3-dioxygenase is not detected in salicylate degradation. Although catechol is the metabolic intermediate for both salicylate and benzoate, catechol did not induce either pathway when used as a sole carbon source.


Enzyme Carbon Source Biodegradation Pseudomonas Catechol 
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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • R. Y. Hamzah
    • 1
  • B. S. Al-Baharna
    • 1
  1. 1.Biotechnology Program, College of Applied SciencesArabian Gulf UniversityManamaBahrain

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