title: Characterization of beta-ketoadipate pathway from multi-drug resistance bacterium, Acinetobacter baumannii DU202 by proteomic approach.
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-dioxygenase alpha subunit (PcaG) and 3-carboxy-cis,cis-muconate cycloisomerase (PcaB)] 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. ADP1. 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.
authors.affiliation: Proteomics Team, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea.
authors.forename: Soon-Ho
authors.initials: SH
authors.lastname: Park
authors.forename: Jae-Woo
authors.initials: JW
authors.lastname: Kim
authors.forename: Sung-Ho
authors.initials: SH
authors.lastname: Yun
authors.forename: Sun Hee
authors.initials: SH
authors.lastname: Leem
authors.forename: Hyung-Yeel
authors.initials: HY
authors.lastname: Kahng
authors.forename: Seung Il
authors.initials: SI
authors.lastname: Kim
mesh_terms: D040981:Acinetobacter baumannii / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D000272:Adipates / Q000378:metabolism*; D000368:Aged; D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001565:Benzoates / Q000378:metabolism; D024901:Drug Resistance, Multiple, Bacterial; D015964:Gene Expression Regulation, Bacterial; D006801:Humans; D008826:Microbial Sensitivity Tests; D008875:Middle Aged; D008969:Molecular Sequence Data; D010226:Parabens / Q000378:metabolism*; D020543:Proteome
chemical_list: D000272:Adipates; D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D001565:Benzoates; D010226:Parabens; D020543:Proteome; C027316:3-oxoadipic acid; C038193:4-hydroxybenzoic acid