Global analysis of posttranscriptional regulation by GlmY and GlmZ in enterohemorrhagic Escherichia coli O157:H7

Charley C. Gruber, Vanessa Sperandio

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Enterohemorrhagic Escherichia coli (EHEC) is a significant human pathogen and is the cause of bloody diarrhea and hemolyticuremic syndrome. The virulence repertoire of EHEC includes the genes within the locus of enterocyte effacement (LEE) that are largely organized in five operons, LEE1 to LEE5, which encode a type III secretion system, several effectors, chaperones, and regulatory proteins. In addition, EHEC also encodes several non-LEE-encoded effectors and fimbrial operons. The virulence genes of this pathogen are under a large amount of posttranscriptional regulation. The small RNAs (sRNAs) GlmY and GlmZ activate the translation of glucosamine synthase (GlmS) in E. coli K-12, and in EHEC they destabilize the 3' fragments of the LEE4 and LEE5 operons and promote translation of the non-LEE-encoded effector EspFu. We investigated the global changes of EHEC gene expression governed by GlmY and GlmZ using RNA sequencing and gene arrays. This study extends the known effects of GlmY and GlmZ regulation to show that they promote expression of the curli adhesin, repress the expression of tryptophan metabolism genes, and promote the expression of acid resistance genes and the non-LEE-encoded effector NleA. In addition, seven novel EHEC-specific sRNAs were identified using RNA sequencing, and three of them-sRNA56, sRNA103, and sRNA350-were shown to regulate urease, fimbria, and the LEE, respectively. These findings expand the knowledge of posttranscriptional regulation in EHEC.

Original languageEnglish (US)
Pages (from-to)1286-1295
Number of pages10
JournalInfection and immunity
Volume83
Issue number4
DOIs
StatePublished - 2015

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Infectious Diseases

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