Transcriptional profiling of Bordetella pertussis reveals requirement of RNA chaperone Hfq for Type III secretion system functionality.
RNA Biol
; 12(2): 175-85, 2015.
Article
en En
| MEDLINE
| ID: mdl-25674816
Bordetella pertussis, the causative agent of human whooping cough (pertussis) produces a complex array of virulence factors in order to establish efficient infection in the host. The RNA chaperone Hfq and small regulatory RNAs are key players in posttranscriptional regulation in bacteria and have been shown to play an essential role in virulence of a broad spectrum of bacterial pathogens. This study represents the first attempt to characterize the Hfq regulon of the human pathogen B. pertussis under laboratory conditions as well as upon passage in the host and indicates that loss of Hfq has a profound effect on gene expression in B. pertussis. Comparative transcriptional profiling revealed that Hfq is required for expression of several virulence factors in B. pertussis cells including the Type III secretion system (T3SS). In striking contrast to the wt strain, T3SS did not become operational in the hfq mutant passaged either through mice or macrophages thereby proving that Hfq is required for the functionality of the B. pertussis T3SS. Likewise, expression of virulence factors vag8 and tcfA encoding autotransporter and tracheal colonization factor, respectively, was strongly reduced in the hfq mutant. Importantly, for the first time we demonstrate that B. pertussis T3SS can be activated upon contact with macrophage cells in vitro.
Palabras clave
ABC protein, ATP-binding cassette protein; Bsp22; CFU, colony forming unit; Hfq; OMP, outer membrane protein; P, P-value; RT-qPCR, quantitative reverse transcription polymerase chain reaction; SS medium, Steiner-Scholte medium; T3SS; T3SS, Type III secretion system; infection; transcriptomics; virulence; wt, wild-type
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Proteínas Bacterianas
/
Bordetella pertussis
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ARN Bacteriano
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Regulación Bacteriana de la Expresión Génica
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Proteína de Factor 1 del Huésped
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Sistemas de Secreción Tipo III
Límite:
Animals
Idioma:
En
Revista:
RNA Biol
Asunto de la revista:
BIOLOGIA MOLECULAR
Año:
2015
Tipo del documento:
Article
País de afiliación:
República Checa
Pais de publicación:
Estados Unidos