Open AccessSiderophore production by the magnetic bacterium Magnetospirillum magneticum AMB‐1
Author(s) -
Calugay Ronie J,
Miyashita Hideaki,
Okamura Yoshiko,
Matsunaga Tadashi
Publication year - 2003
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1016/s0378-1097(02)01188-6
Subject(s) - siderophore , bacteria , catechol , chemistry , biology , microbiology and biotechnology , biochemistry , nuclear chemistry , genetics
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 Fe 3+ 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.