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 Previous Article

Journal of Bacteriology, December 2006, p. 8669-8673, Vol. 188, No. 24
0021-9193/06/$08.00+0     doi:10.1128/JB.00856-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Agrobacterium tumefaciens soxR Is Involved in Superoxide Stress Protection and Also Directly Regulates Superoxide-Inducible Expression of Itself and a Target Gene{triangledown}

Warawan Eiamphungporn,1,2,{dagger} Nisanart Charoenlap,2 Paiboon Vattanaviboon,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 15 June 2006/ Accepted 2 October 2006

Inactivation of Agrobacterium tumefaciens soxR increases sensitivity to superoxide generators. soxR expression is highly induced by superoxide stress and is autoregulated. SoxR also directly regulates the superoxide-inducible expression of atu5152. Taken together, the physiological role of soxR and the mechanism by which it regulates expression of target genes make the A. tumefaciens SoxR system different from other bacterial systems.

* Corresponding author. Mailing address: Laboratory of Biotechnology, Chulabhorn Research Institute, Lak Si, Bangkok 10210, Thailand. Phone: 662 574 0622, ext. 3816. Fax: 662 574 2027. E-mail for S. Mongkolsuk: skorn{at}cri.or.th. E-mail for P. Vattanaviboon: paiboon{at}cri.or.th.

{triangledown} Published ahead of print on 13 October 2006.

{dagger} Present address: Department of Microbiology, Cornell University, Wing Hall, Ithaca, NY 14853-8101.

Journal of Bacteriology, December 2006, p. 8669-8673, Vol. 188, No. 24
0021-9193/06/$08.00+0     doi:10.1128/JB.00856-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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