Siderophore production by the magnetic bacterium Magnetospirillum magneticum AMB-1

Ronie J. Calugay, Hideaki Miyashita, Yoshiko Okamura, Tadashi Matsunaga

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Siderophore production by the magnetic bacterium Magnetospirillum magneticum AMB-1 is elicited by sufficient iron rather than by iron starvation. In order to clarify this unusual pattern, siderophore production was monitored in parallel to iron assimilation using the chrome azurol sulfonate assay and the ferrozine method respectively. Iron concentration lowered approximately five times less than its initial concentration only within 4 h post-inoculation, rendering the medium iron deficient. A concentration of at least 6 μM Fe3+ is required to initiate siderophore production. The propensity of M. magneticum AMB-1 for the assimilation of large amounts of iron accounts for the rapid depletion of iron in the medium, thereby triggering siderophore excretion. M. magneticum AMB-1 produces both hydroxamate and catechol siderophores.

Original languageEnglish
Pages (from-to)371-375
Number of pages5
JournalFEMS Microbiology Letters
Volume218
Issue number2
DOIs
Publication statusPublished - 2003 Jan 28
Externally publishedYes

Keywords

  • Magnetic bacterium
  • Magnetospirillum magneticum
  • Siderophore

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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