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Volume 147, Issue 2

Siderophore uptake and use by the yeast Free

Abstract

The non-reductive uptake of several siderophores (ferrioxamine B, ferrichrome, triacetylfusarinine C and ferricrocin) by various strains of was studied. Several aspects of siderophore transport were examined, including specificity of transport, regulation of transport and intracellular localization of the ferri-siderophores. Ferrioxamine B was taken up preferentially via the products of the gene and triacetylfusarinine C by the gene product, but the specificity was not absolute. Ferrichrome and ferricrocin uptake was not dependent on a single major facilitator superfamily (MFS) gene product. The apparent specificity of transport was strongly dependent on the genetic background of the cells. Non-reductive uptake of siderophores was induced under more stringent conditions (of iron deprivation) than was the reductive uptake of ferric citrate. Regulation of transport depended on the transcriptional factors Aft1 and Tup1/Ssn6. Cells disrupted for the or genes were constitutively derepressed for the uptake of ferrichrome, ferricrocin or ferrioxamine B, but not for the uptake of triacetylfusarinine C. Cells bearing the mutation accumulated large amounts of ferric siderophores. Intracellular decomplexation of the siderophores occurred when transcription of the gene was repressed. Ferrioxamine B and ferrichrome seemed to accumulate in an endosomal compartment, as shown by biochemical studies and by confocal microscopy study of cells loaded with a fluorescent derivative of ferrichrome. Endocytosis was, however, not involved in the non-reductive uptake of siderophores.

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Keyword(s): BPS, bathophenanthrolinedisulfonate , FC, ferricrocin , FCH, ferrichrome , FOB, ferrioxamine B, mesylate form (Desferal) , iron , MFS, major facilitator superfamily , Saccharomyces cerevisiae , siderophore , TAF, triacetylfusarinine C and yeast
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2001-02-01
2024-04-19
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Siderophore uptake and use by the yeast Saccharomyces cerevisiae
Microbiology 147, 289 (2001); https://doi.org/10.1099/00221287-147-2-289
/content/journal/micro/10.1099/00221287-147-2-289
/content/journal/micro/10.1099/00221287-147-2-289
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