Temporal and differential regulation of expression of the eukaryotic-like ankyrin effectors of Legionella pneumophila

Souhaila M. Al Khodor, Tasneem Al-Quadan, Yousef Abu Kwaik

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Upon transition from the exponential (E) to the postexponential phase (PE) of growth, Legionella pneumophila undergoes a phenotypic modulation from a replicative to a highly infectious form. This transition requires a delicate regulatory cascade that is triggered to induce expression of various virulencerelated genes. We have recently characterized eleven L. pneumophila eukaryotic-like ankyrin effectors (Ank) shared between the four sequenced genomes of L. pneumophila. The AnkB effector recruits polyubiquitinated proteins to the Legionella-containing vacuole (LCV). It is not known whether expression of the ank genes is regulated by various regulators triggered at the PE phase and whether this regulation is essential for function. Here we show that temporal and differential regulation of the ank genes is mediated by RelA, the enhancer protein LetE, and the two component systems LetA/S and PmrA/B. Consistent with the expression of ankB at the PE phase, we show that bacteria grown to the PE but not the E phase recruit polyubiquitinated proteins to the LCV within Acanthamoeba in an AnkB-dependant mechanism. We conclude that the genes encoding the eukaryoticlike Ank effectors of L. pneumophila are temporally and spatially regulated at the PE phase.

Original languageEnglish
Pages (from-to)677-684
Number of pages8
JournalEnvironmental Microbiology Reports
Volume2
Issue number5
DOIs
Publication statusPublished - Oct 2010
Externally publishedYes

Fingerprint

Legionella pneumophila
Ankyrins
ankyrins
Legionella
gene
Vacuoles
protein
vacuoles
Acanthamoeba
Genes
Proteins
genes
proteins
genome
Genome
Bacteria
Gene Expression
gene expression
bacterium
regulation

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Ecology, Evolution, Behavior and Systematics

Cite this

Temporal and differential regulation of expression of the eukaryotic-like ankyrin effectors of Legionella pneumophila. / Al Khodor, Souhaila M.; Al-Quadan, Tasneem; Kwaik, Yousef Abu.

In: Environmental Microbiology Reports, Vol. 2, No. 5, 10.2010, p. 677-684.

Research output: Contribution to journalArticle

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