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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The yeast FET5 gene encodes a FET3-related multicopper oxidase implicated in iron transport.

The yeast FET3 gene encodes an integral membrane multicopper oxidase required for high-affinity iron uptake. The FET4 gene encodes an Fe(II) transporter required for low-affinity uptake. To identify other yeast genes involved in iron uptake, we isolated genes that could, when overexpressed, suppress the iron-limited growth defect of a fet3 fet4 mutant. The FET5 gene was isolated in this screen and it encodes a multi-copper oxidase closely related to Fet3p. Several observations indicate that Fet5p plays a role analogous to Fet3p in iron transport. Suppression of the fet3 fet4 mutant phenotype by FET5 overexpression required the putative FTR1 transporter subunit of the high-affinity system. Fet5p is an integral membrane protein whose oxidase domain is located on the cell surface or within an intracellular compartment. Oxidase activity measured in cells with altered levels of FET5 expression suggested that Fet5p is a functional oxidase. FET5 overexpression increased the rate of iron uptake by a novel uptake system. Finally, FET5 mRNA levels are regulated by iron and are increased in cells grown in iron-limited media. These results suggest that Fet5p normally plays a role in the transport of iron.[1]


  1. The yeast FET5 gene encodes a FET3-related multicopper oxidase implicated in iron transport. Spizzo, T., Byersdorfer, C., Duesterhoeft, S., Eide, D. Mol. Gen. Genet. (1997) [Pubmed]
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