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Journal of Bacteriology, June 2009, p. 4047-4050, Vol. 191, No. 12
0021-9193/09/$08.00+0     doi:10.1128/JB.00313-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

VirB Alleviates H-NS Repression of the icsP Promoter in Shigella flexneri from Sites More Than One Kilobase Upstream of the Transcription Start Site{triangledown}

Maria I. Castellanos,§ Dustin J. Harrison,§ Jennifer M. Smith,{dagger} Stephanie K. Labahn, Karen M. Levy, and Helen J. Wing*

School of Life Sciences, University of Nevada, Las Vegas, Las Vegas, Nevada 89154-4004

Received 8 March 2009/ Accepted 1 April 2009

The icsP promoter of Shigella spp. is repressed by H-NS and derepressed by VirB. Here, we show that an inverted repeat located between positions –1144 and –1130 relative to the icsP transcription start site is necessary for VirB-dependent derepression. The atypical location of this cis-acting site is discussed.

* Corresponding author. Mailing address: University of Nevada, Las Vegas, 4505 South Maryland Parkway, Las Vegas, NV 89154-4004. Phone: (702) 895-5382. Fax: (702) 895-3956. E-mail: helen.wing{at}unlv.edu

{triangledown} Published ahead of print on 10 April 2009.

§ These authors contributed equally to this work.

{dagger} Present address: Thomas Jefferson University, Jefferson College of Graduate Studies, Jefferson Alumni Hall, 1020 Locust Street, Philadelphia, PA 19107.

Journal of Bacteriology, June 2009, p. 4047-4050, Vol. 191, No. 12
0021-9193/09/$08.00+0     doi:10.1128/JB.00313-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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