Kim SI, Song SY, Kim KW, Ho EM, Oh KH. Proteomic analysis of the benzoate degradation pathway in Acinetobacter sp. KS-1.
Res Microbiol 2004;
154:697-703. [PMID:
14643408 DOI:
10.1016/j.resmic.2003.09.003]
[Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The purpose of this study was to perform proteome analysis of Acinetobacter sp. KS-1, a bacterium capable of degrading benzoate as a sole carbon source. In order to understand the benzoate degradation pathway used by strain KS-1, proteomes of benzoate-cultured and succinate-cultured KS-1 were comparatively analyzed by two dimensional gel electrophoresis (2-DE). Eighteen protein spots proteins were exclusively induced from the benzoate-cultured strain KS-1. Of these 18 spots, two benzoate-degrading enzymes (catechol 1,2-dioxygenase and beta-ketoadipate succinyl-CoA transferase) were identified by MS/MS analysis by MALDI-TOF/TOF mass spectrometry, which suggests that strain KS-1 degrades benzoate by the beta-ketoadipate pathway. DEAE-chromatography suggested that strain KS-1 induced only one type of catechol 1,2-dioxygenase during benzoate degradation. The catechol 1,2-dioxygenase was purified using three steps of ammonium sulfate precipitation, DEAE-sepharose, and Mono-Q chromatography. The purified catechol 1,2-dioxygenase of strain KS-1 had strong dioxygenase activity for 4-methylcatechol as well as catechol. Sequencing analysis using N-terminal and internal amino acid sequences showed that this catechol 1,2-dioxygenase is highly homologous with catechol 1,2-dioxygenase of Acinetobacter radioresistens. These results suggest that comparative proteomic analysis of biodegrading bacteria cultured under different conditions may be a useful initial step toward the elucidation of the aromatic compound degradation pathway.
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