Iron-limited growth and kinetics of iron uptake in Magnetospirillum gryphiswaldense View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-11

AUTHORS

Dirk Schüler, E. Baeuerlein

ABSTRACT

Growth and magnetite formation in Magnetospirillum gryphiswaldense MSR-1 were found close to the maximum at an extracellular iron concentration of 15-20 microM. Ferrous iron was incorporated by a slow, diffusion-like process. Several iron chelators including various microbial siderophores were unable to promote transport of iron into the cells. In contrast, spent culture fluids stimulated the uptake of ferric iron in iron-depleted cells at a high rate, whereas fresh medium and transport buffer were unable to promote iron uptake. However, no siderophore-like compound could be detected in spent culture fluids by the Chrome Azurol S assay. Ferric iron uptake followed Michaelis-Menten kinetics with a Km of 3 microM and a Vmax of 0.86 nmol min-1 (mg dry weight)-1, suggesting a comparatively low-affinity, but high-velocity transport system. Iron incorporation was sensitive to 2,4-dinitrophenol and carbonylcyanide-m-chlorophenylhydrazone, indicating an energy-dependent transport process. More... »

PAGES

301-307

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002030050387

DOI

http://dx.doi.org/10.1007/s002030050387

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1017301389

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/8929275


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