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Recovery of mrs3Δmrs4Δ Saccharomyces cerevisiae Cells under Iron-Sufficient Conditions and the Role of Fe580

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    Recovery of mrs3Δmrs4Δ Saccharomyces cerevisiae Cells under Iron-Sufficient Conditions and the Role of Fe580
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    † Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
    ‡ Department of Medicine, Division of Hematology-Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
    § Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77843, United States
    *Department of Chemistry, Texas A&M University, College Station, TX 77843-3255. Phone: 979-845-0956. Fax: 979-845-4719. E-mail: [email protected]
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    Biochemistry

    Cite this: Biochemistry 2018, 57, 5, 672–683
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    https://doi.org/10.1021/acs.biochem.7b01034
    Published December 11, 2017
    Copyright © 2017 American Chemical Society
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    Abstract

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    Mrs3 and Mrs4 are mitochondrial inner membrane proteins that deliver an unidentified cytosolic iron species into the matrix for use in iron-sulfur cluster (ISC) and heme biosynthesis. The Mrs3/4 double-deletion strain (ΔΔ) grew slowly in iron-deficient glycerol/ethanol medium but recovered to wild-type (WT) rates in iron-sufficient medium. ΔΔ cells grown under both iron-deficient and iron-sufficient respiring conditions acquired large amounts of iron relative to WT cells, indicating iron homeostatic dysregulation regardless of nutrient iron status. Biophysical spectroscopy (including Mössbauer, electron paramagnetic resonance, and electronic absorption) and bioanalytical methods (liquid chromatography with online inductively coupled plasma mass spectrometry detection) were used to characterize these phenotypes. Anaerobically isolated mitochondria contained a labile iron pool composed of a nonheme high-spin FeII complex with primarily O and N donor ligands, called Fe580. Fe580 likely serves as feedstock for ISC and heme biosynthesis. Mitochondria from respiring ΔΔ cells grown under iron-deficient conditions were devoid of Fe580, ISCs, and hemes; most iron was present as FeIII nanoparticles. O2 likely penetrates the matrix of slow-growing poorly respiring iron-deficient ΔΔ cells and reacts with Fe580 to form nanoparticles, thereby inhibiting ISC and heme biosynthesis. Mitochondria from iron-sufficient ΔΔ cells contained ISCs, hemes, and Fe580 at concentrations comparable to those of WT mitochondria. The matrix of these mutant cells was probably sufficiently anaerobic to protect Fe580 from degradation by O2. An ∼1100 Da manganese complex, an ∼1200 Da zinc complex, and an ∼5000 Da copper species were also present in ΔΔ and WT mitochondrial flow-through solutions. No lower-mass copper complex was evident.

    Copyright © 2017 American Chemical Society

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    This article is cited by 22 publications.

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    Biochemistry

    Cite this: Biochemistry 2018, 57, 5, 672–683
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.biochem.7b01034
    Published December 11, 2017
    Copyright © 2017 American Chemical Society
    Request reuse permissions

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