Fur-regulated iron uptake system of Edwardsiella ictaluri and its influence on pathogenesis and immunogenicity in the catfish host

Javier Santander, Greg Golden, Soo Young Wanda, Roy Curtiss

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The ability of bacterial pathogens to take up iron from the host during infection is necessary for their multiplication within the host. However, host high-affinity iron binding proteins limit levels of free iron in fluids and tissues. To overcome this deficiency of iron during infection, bacterial pathogens have developed iron uptake systems that are upregulated in the absence of iron, typically tightly controlled by the ferric uptake regulator (Fur) protein. The iron uptake system of Edwardsiella ictaluri, a hostrestricted pathogen of channel catfish (Ictalurus punctatus) and the main pathogen of this fish in aquaculture, is unknown. Here we describe the E. ictaluri Fur protein, the iron uptake machinery controlled by Fur, and the effects of fur gene deletion on virulence and immunogenicity in the fish host. Analysis of the E. ictaluri Fur protein shows that it lacks the N-terminal region found in the majority of pathogen-encoded Fur proteins. However, it is fully functional in regulated genes encoding iron uptake proteins. E. ictaluri grown under iron-limited conditions upregulates an outer membrane protein (HemR) that shows heme-hemoglobin transport activity and is tightly regulated by Fur. In vivo studies showed that an E. ictaluri Δfur mutant is attenuated and immune protective in zebrafish (Danio rerio) and catfish (Ictalurus punctatus), triggering systemic immunity. We conclude that an E. ictaluri Δfur mutant could be an effective component of an immersion-oral vaccine for the catfish industry.

Original languageEnglish (US)
Pages (from-to)2689-2703
Number of pages15
JournalInfection and Immunity
Volume80
Issue number8
DOIs
StatePublished - Aug 2012

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Edwardsiella ictaluri
Catfishes
Iron
Ictaluridae
Zebrafish
Proteins
Fishes
Iron-Binding Proteins
Aquaculture
Gene Deletion
Immersion
Heme
Bacterial Infections
Virulence
Immunity
Industry
Membrane Proteins
Hemoglobins
Up-Regulation
Vaccines

ASJC Scopus subject areas

  • Immunology
  • Microbiology
  • Parasitology
  • Infectious Diseases

Cite this

Fur-regulated iron uptake system of Edwardsiella ictaluri and its influence on pathogenesis and immunogenicity in the catfish host. / Santander, Javier; Golden, Greg; Wanda, Soo Young; Curtiss, Roy.

In: Infection and Immunity, Vol. 80, No. 8, 08.2012, p. 2689-2703.

Research output: Contribution to journalArticle

Santander, Javier ; Golden, Greg ; Wanda, Soo Young ; Curtiss, Roy. / Fur-regulated iron uptake system of Edwardsiella ictaluri and its influence on pathogenesis and immunogenicity in the catfish host. In: Infection and Immunity. 2012 ; Vol. 80, No. 8. pp. 2689-2703.
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