Identification and characterization of an indigo-producing oxygenase involved in indole 3-acetic acid utilization by Acinetobacter baumannii

Guang Huey Lin, Hao Ping Chen, Jui Hsin Huang, Tze Tze Liu, Tze Kang Lin, Shih Jon Wang, Cheng Hsing Tseng, Hung Yu Shu*

*此作品的通信作者

研究成果: Article同行評審

42 引文 斯高帕斯(Scopus)

摘要

Acinetobacter baumannii harbours a gene cluster similar to the iac locus of Pseudomonas putida 1290, which can catabolize the plant hormone indole 3-acetic acid (IAA) as an energy source. However, there has been no evidence showing that IAA can be utilized by A. baumannii. This study showed that A. baumannii can grow in M9 minimalmediumcontaining IAA as the sole carbon source. A mutagenesis study indicated that iacA, encoded in the iac locus of A. baumannii, is involved in the catabolism of IAA. As shown bywestern blotting analysis, the IacA protein was detected in A. baumannii grown inM9 minimal medium with IAA but notwith pyruvate, suggesting that the expression of iacA is regulated by the presence of IAA. In vitro studies have shown that IacA can oxidize indole, an IAA-like molecule, converting it to indoxyl, which spontaneously dimerises to form indigo. In this study, we show that the crude extracts from either wild-type A. baumannii or Escherichia coli overexpressing IacA can oxidize IAA. These results imply that the iac gene cluster of A. baumannii is involved in IAA degradation and that the iacA gene is upregulated when cells encounter IAA in their native environments.

原文English
頁(從 - 到)881-890
頁數10
期刊Antonie van Leeuwenhoek
101
發行號4
DOIs
出版狀態Published - 5月 2012

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