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Journal of Bacteriology, March 2002, p. 1287-1295, Vol. 184, No. 5
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.5.1287-1295.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

YopD and LcrH Regulate Expression of Yersinia enterocolitica YopQ by a Posttranscriptional Mechanism and Bind to yopQ RNA

*** Deborah M. Anderson,,{dagger} Kumaran S. Ramamurthi,,{ddagger} Christina Tam,,{ddagger} and Olaf Schneewind,{ddagger}*

Department of Microbiology & Immunology, University of California-Los Angeles School of Medicine, Los Angeles, California 90095

Received 14 September 2001/ Accepted 16 November 2001

Pathogenic yersiniae secrete 14 Yop proteins via the type III pathway. Synthesis of YopQ occurs when the type III machinery is activated by a low-calcium signal, but not when the calcium concentration is above 100 µM. To characterize the mechanism that regulates the expression of yopQ, mutants that permit synthesis of YopQ in the presence of calcium were isolated. Yersiniae bearing deletion mutations in yopN, tyeA, sycN, or yscB synthesized and secreted YopQ in both the presence and the absence of calcium. In contrast, yersiniae with a deletion in yopD or lcrH synthesized YopQ in the presence of calcium but did not secrete the polypeptide. These variants displayed no defect in YopQ secretion under low-calcium conditions, revealing that yopD and lcrH are required for the regulation of yopQ expression. Experiments with transcriptional and translational fusions to the npt reporter gene suggest that yopD and lcrH regulate yopQ expression at a posttranscriptional step. YopD and LcrH form a complex in the bacterial cytosol and bind yopQ mRNA. Models that can account for posttranscriptional regulatory mechanisms of yop expression are discussed.

* Corresponding author. Mailing address: Committee on Microbiology, The University of Chicago, 920 East 58th Street, Chicago, IL 60637. Phone: (773) 834-9060. Fax: (773) 834-8150. E-mail: oschnee{at}delphi.bsd.uchicago.edu.

{dagger} Present address: Division of Cellular and Molecular Medicine, School of Medicine, University of California San Diego, La Jolla, CA 92093.

{ddagger} Present address: Committee on Microbiology, The University of Chicago, Chicago, IL 60637.

Journal of Bacteriology, March 2002, p. 1287-1295, Vol. 184, No. 5
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.5.1287-1295.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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