DOI: 10.1111/j.1432-1033.1991.tb16209.x. Identification and characterization of a <i>Saccharomyces cerevisiae</i> gene (PAR1) conferring resistance to iron chelators

Identification and characterization of a Saccharomyces cerevisiae gene (PAR1) conferring resistance to iron chelators

10.1111/j.1432-1033.1991.tb16209.x

Crossref journal-article

Wiley

European Journal of Biochemistry (311)

Abstract

o‐Phenanthroline (1,10‐phenanthroline) is a chemical known to chelate iron and other transition metal ions. This compound was added to solid yeast media to reduce the concentration of biologically available iron. Other essential divalent cations, like Zn2+ or Cu2+, which could also be bound, were supplemented. Growth of wild‐type yeast strains was totally inhibited at specific concentrations of the chelator. However, several cells containing plasmids of a multicopy vector genomic library of S. cerevisiae could be selected by growth on these media. All of the resistant clones carried a single additional gene, PAR1 on their multicopy plasmids.Plasmid‐directed overexpression of PAR1 increased the resistance of transformants to o‐phenanthroline and additionally conferred resistance to 1‐nitroso‐2‐naphthol, an iron(III)‐binding molecule with different coordinating ligands. By supplementing the o‐phenanthroline‐containing media with several different metal ions, it could be proved that the selection plates really caused a specific iron limitation. These observations clearly demonstrated that the overexpressed PAR1 gene enables the cell to compete with iron‐chelating organic molecules. PAR1 null mutants, constructed by insertion of the LEU2 gene into the open reading frame, showed a remarkable phenotype: they did not grow on slightly alkaline buffered media (pH > 7) and became hypersensitive to oxidative stress by hydrogen peroxide. Of several heavy metal ions, such as Fe3+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+, tested for supplementation of the alkaline growth deficiency, only iron, either added in the ferrous or ferric form, was able to restore cellular growth.It can be concluded from the DNA sequence that PAR1 encodes a highly acidic protein of 650 residues with mostly hydrophilic character. Some interesting repetitive amino acid motifs, such as (Asp‐Asn)4 or Cys‐Ser‐Glu, may act as metal‐binding sites. The possible role of PAR1 is discussed.

Bibliography

SCHNELL, N., & ENTIAN, K. (1991). Identification and characterization of a Saccharomyces cerevisiae gene (PAR1) conferring resistance to iron chelators. European Journal of Biochemistry, 200(2), 487â493. Portico.

Authors 2

Norbert SCHNELL (first)
Karl‐Dieter ENTIAN (additional)

References 30 Referenced 58

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Dates

Type	When
Created	20 years, 5 months ago (March 4, 2005, 12:38 a.m.)
Deposited	1 year, 9 months ago (Nov. 23, 2023, 1:33 a.m.)
Indexed	1 year, 2 months ago (June 7, 2024, 12:38 a.m.)
Issued	33 years, 11 months ago (Sept. 1, 1991)
Published	33 years, 11 months ago (Sept. 1, 1991)
Published Online	20 years, 5 months ago (March 3, 2005)
Published Print	33 years, 11 months ago (Sept. 1, 1991)

Funders 0

None

BibTeX

@article{SCHNELL_1991, title={Identification and characterization of a Saccharomyces cerevisiae gene (PAR1) conferring resistance to iron chelators}, volume={200}, ISSN={1432-1033}, url={http://dx.doi.org/10.1111/j.1432-1033.1991.tb16209.x}, DOI={10.1111/j.1432-1033.1991.tb16209.x}, number={2}, journal={European Journal of Biochemistry}, publisher={Wiley}, author={SCHNELL, Norbert and ENTIAN, Karl‐Dieter}, year={1991}, month=sep, pages={487–493} }

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