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Journal of Bacteriology, December 2009, p. 7372-7377, Vol. 191, No. 23
0021-9193/09/$08.00+0     doi:10.1128/JB.00788-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

The Catalase-Peroxidase KatG Is Required for Virulence of Xanthomonas campestris pv. campestris in a Host Plant by Providing Protection against Low Levels of H2O2{triangledown}

Thichakorn Jittawuttipoka,1,{dagger} Sarinya Buranajitpakorn,1,{dagger} Paiboon Vattanaviboon,2,3,5 and Skorn Mongkolsuk1,2,3,4,5*

Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand,1 Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok 10210, Thailand,2 Chulabhorn Graduate Institute, Bangkok 10210, Thailand,3 Center for Emerging Bacterial Infections, Faculty of Science, Mahidol University, Bangkok 10400, Thailand,4 Center of Excellence on Environmental Health, Toxicology and Management of Chemicals, Bangkok, Thailand5

Received 17 June 2009/ Accepted 15 September 2009

Xanthomonas campestris pv. campestris katG encodes a catalase-peroxidase that has a role in protecting the bacterium against micromolar concentrations of H2O2. A knockout mutation in katG that causes loss of catalase-peroxidase activity correlates with increased susceptibility to H2O2 and a superoxide generator and is avirulent in a plant model system. katG expression is induced by oxidants in an OxyR-dependent manner.

* 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: skorn{at}cri.or.th

{triangledown} Published ahead of print on 25 September 2009.

{dagger} These authors contributed equally to this work.

Journal of Bacteriology, December 2009, p. 7372-7377, Vol. 191, No. 23
0021-9193/09/$08.00+0     doi:10.1128/JB.00788-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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