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Effects of iron limitation on growth and carbon metabolism in oceanic and coastal heterotrophic bacteria
Author(s) -
Fourquez Marion,
Devez Aurélie,
Schaumann Annick,
Guéneuguès Audrey,
Jouenne Thierry,
Obernosterer Ingrid,
Blain Stéphane
Publication year - 2014
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.2014.59.2.0349
Subject(s) - heterotroph , metabolism , bacteria , citric acid cycle , carbon cycle , microbial metabolism , carbon fibers , strain (injury) , marine bacteriophage , biology , bacterial growth , catabolism , alteromonas , biochemistry , chemistry , ecology , materials science , ecosystem , genetics , anatomy , composite number , composite material
We investigated the metabolic response to iron (Fe) limitation of two bacterial strains of Alteromonas macleodii , isolated from a coastal and an oceanic marine environment. Bacteria were grown under Fe‐limited and Fe‐replete conditions, and comparative analyses of cellular properties and total proteomes were conducted. Respiration was reduced by a factor of two in both strains, but the growth rate of the oceanic strain was less affected by Fe limitation (reduced by 1.2‐fold) than the coastal strain (reduced by 2‐fold). Fe limitation led to significant changes in the expression of several key enzymes associated with carbon catabolism, specifically those involved in the citric acid cycle, glycolysis, and oxidative phosphorylation. The strain‐specific overall responses to Fe limitation were in part reflected in different metabolic strategies of the carbon metabolism and energy acquisition. Our study provides novel insights on how Fe limitation can affect bacterial heterotrophic metabolism, and how this could influence the coupling of the Fe and carbon cycles in the ocean.