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J. Bacteriol., 01 1997, 115-121, Vol 179, No. 1
Copyright © 1997, American Society for Microbiology

2-Naphthoate catabolic pathway in Burkholderia strain JT 1500

B Morawski, RW Eaton, JT Rossiter, S Guoping, H Griengl and DW Ribbons
Institute of Organic Chemistry, SFB Biocatalysis, Technical University Graz, Austria.

Burkholderia strain (JT 1500), able to use 2-naphthoate as the sole source of carbon, was isolated from soil. On the basis of growth characteristics, oxygen uptake experiments, enzyme assays, and detection of intermediates, a degradation pathway of 2-naphthoate is proposed. The features of this pathway are convergent with those for phenanthrene. We propose a pathway for the conversion of 2-naphthoate to 1 mol (each) of pyruvate, succinate, and acetyl coenzyme A and 2 mol of CO2. During growth in the presence of 2-naphthoate, six metabolites were detected by thin-layer chromatography, high-performance liquid chromatography, and spectroscopy. 1-Hydroxy-2-naphthoate accumulated in the culture broth during growth on 2-naphthoate. Also, the formation of 2'-carboxybenzalpyruvate, phthalaldehydate, phthalate, protocatechuate, and beta-carboxy-cis,cis-muconic acid was demonstrated. (1R,2S)-cis-1,2- Dihydro-1,2-dihydroxy-2-naphthoate was thus considered an intermediate between 2-naphthoate and 1-hydroxy-2-naphthoate, but it was not transformed by whole cells or their extracts. We conclude that this diol is not responsible for the formation of 1-hydroxy-2-naphthoate from 2-naphthoate but that one of the other three diastereomers is not eliminated as a potential intermediate for a dehydration reaction.


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