PMID: 2484758Jun 1, 1989Paper

Ferrous iron uptake by Bifidobacterium breve

Biological Trace Element Research
A Bezkorovainy, L Solberg

Abstract

Bifidobacterium breve transports ferrous iron in preference to the ferric form in a saturable, concentration-dependent manner with an optimum pH of 6. Iron transport is highly temperature sensitive. Two transport systems with apparent Km's of 86 +/- 27 and 35 +/- 20 microM (p greater than 0.01) were distinguished, one operating at high iron concentrations, the other at low iron concentrations. Iron uptake could not be accounted for by surface binding. Uptake of iron was inhibited by iron chelators, a protein ionophore, and ATPase inhibitors, and it was stimulated by potassium ionophores. The presence of a ferri reductase in the insoluble cell fraction of B. breve and its "spent" growth medium was demonstrated. The hypothesis is presented that iron uptake by bifidobacteria is related to the nutritional immunity phenomenon.

References

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Aug 5, 1975·Biochimica Et Biophysica Acta·I D RyabovaY A Ovchinnikov
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Citations

Jul 1, 1993·Biological Trace Element Research·E KotA Bezkorovainy
Jul 1, 1993·The International Journal of Biochemistry·E Kot, A Bezkorovainy
Jan 17, 2015·BMC Microbiology·Pamela Vazquez-GutierrezChristophe Chassard
Jun 18, 2017·Frontiers in Microbiology·Noreen LaniganDouwe van Sinderen
Dec 20, 1999·Journal of Agricultural and Food Chemistry·E Kot, A Bezkorovainy

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