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Applied and Environmental Microbiology, March 2008, p. 1634-1638, Vol. 74, No. 5
0099-2240/08/$08.00+0     doi:10.1128/AEM.02512-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

A Legionella pneumophila Peptidyl-Prolyl cis-trans Isomerase Present in Culture Supernatants Is Necessary for Optimal Growth at Low Temperatures{triangledown}

Maria A. Söderberg and Nicholas P. Cianciotto*

Department of Microbiology and Immunology, Northwestern University Medical School, Chicago, Illinois 60611

Received 7 November 2007/ Accepted 21 December 2007

Several Legionella pneumophila proteins were highly expressed in low-temperature supernatants. One of these proteins was the peptidyl-prolyl isomerase PpiB. Mutants lacking ppiB exhibited reduced growth at 17°C. Since PpiB lacked a signal sequence and was present in 17°C supernatants of type II and type IV secretion mutants, this protein may be secreted by a novel mechanism.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Northwestern University Medical School, 320 East Superior St., Chicago, IL 60611. Phone: (312) 503-0385. Fax: (312) 503-1339. E-mail: n-cianciotto{at}northwestern.edu

{triangledown} Published ahead of print on 28 December 2007.

Applied and Environmental Microbiology, March 2008, p. 1634-1638, Vol. 74, No. 5
0099-2240/08/$08.00+0     doi:10.1128/AEM.02512-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



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