Identification of an iron acquisition machinery in Flavobacterium columnare

Lingyu Guan, Javier Santander, Melha Mellata, Yuangxing Zhang, Roy Curtiss

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Flavobacterium columnare, a fastidious Gram-negative pathogen and the causative agent of columnaris disease, is one of the most harmful pathogens in the freshwater fish-farming industry. Nevertheless the virulence mechanisms of F. columnare are not well understood. Bacterial iron uptake from the host during infection is an important mechanism of virulence. Here we identified and analyzed part of the iron uptake machinery of F. columnare. Under iron-limited conditions during in vitro growth, synthesis of an outer membrane protein of ~86 kDa was upregulated. This protein was identified as a TonB-dependent ferrichrome-iron receptor precursor (FhuA). Synthesis of siderophores in F. columnare was corroborated by chrome azurol S assays. A putative ferric uptake regulator (Fur) protein was also identified in the F. columnare genome. Structural analysis of the F. columnare Fur protein revealed that it was similar to Fur proteins involved in iron uptake regulation of other bacteria. Furthermore, Salmonella enterica serovar Typhimurium (S. Typhimurium) Δfur mutants were partially complemented by the F. columnare fur gene. We conclude that a siderophore-mediated iron uptake system exists in F. columnare, and fur from F. columnare could partially complement S. Typhimurium Δfur mutant.

Original languageEnglish (US)
Pages (from-to)129-138
Number of pages10
JournalDiseases of Aquatic Organisms
Volume106
Issue number2
DOIs
StatePublished - Oct 11 2013

Fingerprint

Flavobacterium columnare
machinery
iron
uptake mechanisms
protein
fur
siderophore
virulence
pathogen
siderophores
ferrichrome
structural analysis
proteins
mutants
synthesis
genome
pathogens
outer membrane proteins
assay
fish culture

Keywords

  • FhuA
  • Flavobacterium columnare
  • Fur
  • Iron uptake
  • Siderophore

ASJC Scopus subject areas

  • Aquatic Science
  • Ecology, Evolution, Behavior and Systematics

Cite this

Guan, L., Santander, J., Mellata, M., Zhang, Y., & Curtiss, R. (2013). Identification of an iron acquisition machinery in Flavobacterium columnare. Diseases of Aquatic Organisms, 106(2), 129-138. https://doi.org/10.3354/dao02635

Identification of an iron acquisition machinery in Flavobacterium columnare. / Guan, Lingyu; Santander, Javier; Mellata, Melha; Zhang, Yuangxing; Curtiss, Roy.

In: Diseases of Aquatic Organisms, Vol. 106, No. 2, 11.10.2013, p. 129-138.

Research output: Contribution to journalArticle

Guan, L, Santander, J, Mellata, M, Zhang, Y & Curtiss, R 2013, 'Identification of an iron acquisition machinery in Flavobacterium columnare', Diseases of Aquatic Organisms, vol. 106, no. 2, pp. 129-138. https://doi.org/10.3354/dao02635
Guan, Lingyu ; Santander, Javier ; Mellata, Melha ; Zhang, Yuangxing ; Curtiss, Roy. / Identification of an iron acquisition machinery in Flavobacterium columnare. In: Diseases of Aquatic Organisms. 2013 ; Vol. 106, No. 2. pp. 129-138.
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