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Infection and Immunity, July 2006, p. 4349-4353, Vol. 74, No. 7
0019-9567/06/$08.00+0     doi:10.1128/IAI.01939-05

The Animal Pathogen-Like Type III Secretion System Is Required for the Intracellular Survival of Burkholderia mallei within J774.2 Macrophages

Wilson J. Ribot and Ricky L. Ulrich*

Bacteriology Division, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland 21702-5011

Received 28 November 2005/ Returned for modification 19 January 2006/ Accepted 30 March 2006

Burkholderia mallei is a highly infectious gram-negative pathogen and is the causative agent of human and animal glanders. By generating polar mutations (disruption of bsaQ and bsaZ) in the B. mallei ATCC 23344 animal pathogen-like type III secretion system (TTS), we demonstrate that this bacterial protein delivery system is required for intracellular growth of B. mallei in J774.2 cells, formation of macrophage membrane protrusions, actin polymerization, and phagosomal escape. These findings suggest that TTS plays a role in the intracellular trafficking of B. mallei and may facilitate cell-to-cell spread via actin-based motility.

* Corresponding author. Mailing address: Bacteriology Division, USAMRIID, 1425 Porter St., Fort Detrick, Frederick, MD 21702. Phone: (301) 619-8332. Fax: (301) 619-8351. E-mail: Ricky.Ulrich{at}AMEDD.ARMY.MIL.

Editor: V. J. DiRita

Infection and Immunity, July 2006, p. 4349-4353, Vol. 74, No. 7
0019-9567/06/$08.00+0     doi:10.1128/IAI.01939-05




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