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Published on August 25, 2006; 10.1104/pp.106.085936

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Received June 28, 2006
Accepted August 21, 2006

The Key Role of Chlorocatechol 1,2-dioxygenase in Phyto-removal and Degradation of Catechol by Transgenic Arabidopsis

Yang Liao , Xiao Zhou , Jin Yu , Yajun Cao , Xian Li , and Benke Kuai *

Department of Biochemistry, State Key Laboratory of Genetic Engineering, School of Life Sciences, Fudan University, Shanghai 200433, China

* Corresponding author; email: bkkuai{at}fudan.edu.cn.

Transgenic exploitation of bacterial degradative genes in plants has been considered a favorable strategy for degrading organic pollutants in the environment. The aromatic ring characteristic of these pollutants is mainly responsible for their recalcitrance to degradation. In this study, a Plesiomonas-derived chlorocatechol 1, 2-dioxygenase (TfdC) gene (tfdC), capable of cleaving the aromatic ring, was introduced into Arabidopsis thaliana. Morphology and growth of transgenic plants are indistinguishable from those of wild-type plants. In contrast, they show significantly enhanced tolerances to catechol. Transgenic plants also exhibit strikingly higher capabilities of removing catechol from their media and high efficiencies of converting catechol to cis,cis-muconic acid. As far-less-than-calculated amounts of cis,cis-muconic acid were accumulated within the transgenic plants , existence of endogenous TfdD- and TfdE-like activities was postulated and subsequently putative orthologs of bacterial tfdD and tfdE were detected in Arabidopsis. However, no TfdC activity and no putative orthologs of either tfdC or tfdF were identified. This work indicates that the TfdC activity, conferred by tfdC in transgenic Arabidopsis, is a key requirement for phyto-removal and degradation of catechol, and also suggests that microbial degradative genes may be transgenically exploited in plants for bioremediation of aromatic pollutants in the environment.






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