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Journal of Bacteriology, May 2007, p. 3660-3664, Vol. 189, No. 9
0021-9193/07/$08.00+0     doi:10.1128/JB.01662-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

HpdR Is a Transcriptional Activator of Sinorhizobium meliloti hpdA, Which Encodes a Herbicide-Targeted 4-Hydroxyphenylpyruvate Dioxygenase{triangledown}

Suvit Loprasert,1* Wirongrong Whangsuk,1 James M. Dubbs,1 Ratiboot Sallabhan,1 Kumpanart Somsongkul,1 and Skorn Mongkolsuk1,2

Laboratory of Biotechnology, Chulabhorn Research Institute, Lak Si, Bangkok 10210, Thailand,1 Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand2

Received 27 October 2006/ Accepted 19 February 2007

Sinorhizobium meliloti hpdA, which encodes the herbicide target 4-hydroxyphenylpyruvate dioxygenase, is positively regulated by HpdR. Gel mobility shift and DNase I footprinting analyses revealed that HpdR binds to a region that spans two conserved direct-repeat sequences within the hpdR-hpdA intergenic space. HpdR-dependent hpdA transcription occurs in the presence of 4-hydroxyphenylpyruvate, tyrosine, and phenylalanine, as well as during starvation.

* Corresponding author. Mailing address: Laboratory of Biotechnology, Chulabhorn Research Institute, Vibhavadee-Rangsit Highway, Bangkok 10210, Thailand. Phone: (662) 574-0622. Fax: (662) 574-2027. E-mail: suvit{at}cri.or.th

{triangledown} Published ahead of print on 2 March 2007.

Journal of Bacteriology, May 2007, p. 3660-3664, Vol. 189, No. 9
0021-9193/07/$08.00+0     doi:10.1128/JB.01662-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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