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Journal of Biological Chemistry
Article . 2007 . Peer-reviewed
License: CC BY
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Journal of Biological Chemistry
Article
License: CC BY
Data sources: UnpayWall
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The Metalloreductase Fre6p in Fe-Efflux from the Yeast Vacuole

Authors: Arvinder, Singh; Navjot, Kaur; Daniel J, Kosman;

The Metalloreductase Fre6p in Fe-Efflux from the Yeast Vacuole

Abstract

The yeast vacuole is the storage depot for cellular iron. In this report we quantify the import-export balance in the vacuole because of the import of iron by Ccc1p and to export by the combined activity of Smf3p and the ferroxidase, permease pair of proteins, Fet5p and Fth1p. Our data indicate that the two efflux pathways are equally efficient in trafficking iron out of the vacuole. A major focus of this work was to identify the ferrireductase(s) that supplies the Fe(II) for efflux whether by Smf3p or the Fet5p-Fth1p complex. Using a combination of flameless atomic absorption spectrophotometry to quantify vacuolar and whole cell iron content and a reporter assay for cytoplasmic iron we demonstrate that Fre6p supplies Fe(II) to both efflux systems, while Fre7p plays no role in Fe-efflux from the vacuole. Enzymatic assay shows the two fusions to have similar reductase activity, however. Confocal fluorescence microscopy demonstrates that Fre6:GFP localizes to the vacuolar membrane; in contrast, Fre7:GFP fusions exhibit a variable and diffuse cellular distribution. Demonstrating a role for a vacuolar metalloreductase in Fe-efflux supports the model that iron is stored in the vacuole in the ferric state.

Keywords

Ion Transport, Microscopy, Confocal, Saccharomyces cerevisiae Proteins, FMN Reductase, Cations, Divalent, Iron, Spectrophotometry, Atomic, Cell Membrane, Saccharomyces cerevisiae, Vacuoles, Oxidoreductases, Cation Transport Proteins

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
68
Top 10%
Top 10%
Top 10%
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