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Identification of Chromosomal Genes in Yersinia pestis that Influence Type III Secretion and Delivery of Yops into Target Cells

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [2];  [4];  [2];  [5]
  1. Indiana University, Bloomington, IN (United States); DOE/OSTI
  2. University of Chicago, IL (United States)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States)
  4. Indiana University, Bloomington, IN (United States)
  5. Indiana University, Bloomington, IN (United States); University of Chicago, IL (United States)

Pathogenic Yersinia species possess a type III secretion system, which is required for the delivery of effector Yop proteins into target cells during infection. Genes encoding the type III secretion machinery, its substrates, and several regulatory proteins all reside on a 70-Kb virulence plasmid. Genes encoded in the chromosome of yersiniae are thought to play important roles in bacterial perception of host environments and in the coordinated activation of the type III secretion pathway. Here, we investigate the contribution of chromosomal genes to the complex regulatory process controlling type III secretion in Yersinia pestis. Using transposon mutagenesis, we identified five chromosomal genes required for expression or secretion of Yops in laboratory media. Four out of the five chromosomal mutants were defective to various extents at injecting Yops into tissue culture cells. Interestingly, we found one mutant that was not able to secrete in vitro but was fully competent for injecting Yops into host cells, suggesting independent mechanisms for activation of the secretion apparatus. When tested in a mouse model of plague disease, three mutants were avirulent, whereas two strains were severely attenuated. Together these results demonstrate the importance of Y. pestis chromosomal genes in the proper function of type III secretion and in the pathogenesis of plague.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Great Lakes Regional Center of Excellence; National Institute of Allergy and Infectious Diseases; Indiana University; National Institute of Allergy and Infectious Diseases
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1627507
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 3 Vol. 7; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Resistance to Innate Immunity Contributes to Colonization of the Insect Gut by Yersinia pestis journal July 2015
Illuminating Targets of Bacterial Secretion journal August 2015
Regulation of the Yersinia type III secretion system: traffic control journal January 2013
YopK controls both rate and fidelity of Yop translocation: Control of translocation by YopK journal December 2012

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