Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Characterization of $\beta$-Ketoadipate Pathway from Multi-Drug Resistance Bacterium, Acinetobacter baumannii DU202 by Proteomic Approach

  • Park, Soon-Ho (Proteomics Team, Korea Basic Science Institute) ;
  • Kim, Jae-Woo (Department of Laboratory Medicine, Dong-A University Medical Center) ;
  • Yun, Sung-Ho (Proteomics Team, Korea Basic Science Institute) ;
  • Leem, Sun-Hee (Department of Biology, Dong-A University) ;
  • Kahng, Hyung-Yeel (Department of Environmental Education, Sunchon National University) ;
  • Kim, Seung-Il (Proteomics Team, Korea Basic Science Institute)
  • Published : 2006.12.31
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Abstract

In this study, the biodegradative activities of monocyclic aromatic compounds were determined from the multi-drug resistant (MDR) Acinetobacter baumannii, which were studied in the form of clinical isolates from a hospital in Korea. These bacteria were capable of biodegrading monocyclic aromatic compounds, such as benzoate and p-hydroxybenzoate. In order to determine which pathways are available for biodegradation in these stains, we conducted proteome analyses of benzoate, and p-hydroxybenzoate-cultured A. baumannii DU202, using 2-DE/MS analysis. As genome DB of A. baumannii was not yet available, MS/MS analysis or de novo sequencing methods were employed in the identification of induced proteins. Benzoate branch enzymes [catechol 1,2-dioxygenase (CatA) and benzoate dioxygenase $\alpha$ subunit (BenA)] of the $\beta$-ketoadipate pathway were identified under benzoate culture condition and p-hydroxybenzoate branch enzymes [protocatechuate 3,4-dioxygenas $\alpha$ subunit (PcaG) and 3-carboxy-cis,cis-muconate cycloisomerase (PcaR)] of the $\beta$-ketoadipate pathway were identified under p-hydroxybenzoate culture condition, respectively, thereby suggesting that strain DU202 utilized the $\beta$-ketoadipate pathway for the biodegradation of monocyclic aromatic compounds. The sequence analysis of two purified dioxygenases (CatA and PcaGH) indicated that CatA is closely associated with the CatA of Acinetobacter radiresistance, but PcaGH is only moderately associated with the PcaGH of Acinetobacter sp. ADPI. Interestingly, the fused form of PcaD and PcaC, carboxymuconolactone decarboxylase (PcaCD), was detected on benzoate-cultured A. baumannii DU202. These results indicate that A. baumannii DU202 exploits a different $\beta$-ketoadipate pathway from other Acinetobacter species.

Keywords

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