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• W2012356113 abstract "A peptide motif Glu-Xaa-Xaa-Glu has been implicated in direct binding of ferric iron in several proteins involved in iron transport, sensing or storage. However, it is not known whether the motif alone is sufficient for iron binding and whether functional replacement of the conserved residues by other amino acids with similar properties is possible. We previously identified a Candida albicans iron permease, CaFtr1p, which contains five Glu-Xaa-Xaa-Glu motifs [Ramanan and Wang (2000) Science 288, 1062-1065]. In this study, we investigated the role of each of these motifs in iron uptake by site-directed mutagenesis. Substitution of Ala for any one of the two Glu residues in Glu-Gly-Leu-Glu(158-161) abolished iron-uptake activity, while the same substitution in any of the other four motifs had little effect, indicating that only the motif at position 158-161 is required for iron transport. We then evaluated the importance of each of the residues within and immediately adjacent to this motif in iron uptake. The permease remained active when any one of the Glu residues was replaced by Asp, while it became inactive when both were replaced. We also found that the amino acid immediately in front of Glu-Gly-Leu-Glu(158-161) must be either Arg or Lys. In addition, substitution of any of the two residues in the middle with several structurally distinct amino acids had no detectable effect on iron uptake. Here we propose to extend the iron-binding motif to Arg/Lys-Glu/Asp-Xaa-Xaa-Glu or Arg/Lys-Glu-Xaa-Xaa-Glu/Asp, which may serve as a guide for the identification of potential iron-binding sites in proteins." @default.
• W2012356113 created "2016-06-24" @default.
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• W2012356113 date "2002-12-01" @default.
• W2012356113 modified "2023-09-26" @default.
• W2012356113 title "Characterization of iron-binding motifs in Candida albicans high-affinity iron permease CaFtr1p by site-directed mutagenesis" @default.
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• W2012356113 doi "https://doi.org/10.1042/bj20021005" @default.
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