Accelerated Degradation of Exogenous Indole by Burkholderia unamae Strain CK43B Exposed to Pyrogallol-Type Polyphenols

作者：Kim Dongyeop; Rahman Atiqur; Sitepu Irnayuli R; Hashidoko Yasuyuki^*

来源：Bioscience Biotechnology and Biochemistry, 2013, 77(8): 1722-1727.

DOI：10.1271/bbb.130282

• indole degradation
• cometabolic effect
• pyrogallol-type polyphenols
• Burkholderia unamae
• anthranilic acid decomposition

In modified Winogradsky%26apos;s (MW) medium supplemented with excessive indole (1), Burkholderia unamae strain CK43B isolated from polyphenol-rich Shorea rhizosphere showed almost no cell growth, but it showed drastic cell growth given further supplementation of gallic acid, a simple plant polyphenol. This active cell growth of B. unamae CK43B was due to the stimulating effect of gallic acid on 1-degradation of bacterial cells, which acquired a nitrogen source in 1. Under aerobic culture conditions with appropriate concentrations (0.5-2.0 mm) of gallic acid, B. unamae CK43B started to decompose exogenous 1 in a dose-dependent manner, and finally accumulated catechol (5) via anthranilic acid (4). Pyrogallol also showed a cometabolic effect on decarboxylation-coupled oxidative deamination of B. unamae CK43B, producing 5 from 4, as gallic acid did. These results suggest that pyrogallol-type plant polyphenols act as stimulators on B. unamae CK43B, causing it to degrade an N-heterocyclic aromatic compound (NHAC) including nitrogen-containing humic substances.

• 出版日期2013-8