HOL1 mutations confer novel ion transport in Saccharomyces cerevisiae

Richard F. Gaber*, Morten C. Kielland-Brandt, Gerald R. Fink

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Saccharomyces cerevisiae histidine auxotrophs are unable to use L-histidinol as a source of histidine even when they have a functional histidinol dehydrogenase. Mutations in the hol1 gene permit growth of His- cells on histidinol by enhancing the ability of cells to take up histidinol from the medium. Second-site mutations linked to HOL1-1 further increase histidinol uptake. HOL1 double mutants and, to a lesser extent, HOL1-1 single mutants show hypersensitivity to specific cations added to the growth medium, including Na+, Li+, Cs+, Be2+, guanidinium ion, and histidinol, but not K+, Rb+, Ca2+, or Mg2+. The Na+-hypersensitive phenotype is correlated with increased uptake and accumulation of this ion. The HOL1-1-101 gene was cloned and used to generate a viable haploid strain containing a hol1 deletion mutation (hol1Δ). The uptake of cations, the dominance of the mutant alleles, and the relative inability of hol1Δ cells to take up histidinol or Na+ suggest that hol1 encodes an ion transporter. The novel pattern of ion transport conferred by HOL1-1 and HOL1-1-101 mutants may be explained by reduced selectivity for the permeant ions.

Original languageEnglish (US)
Pages (from-to)643-652
Number of pages10
JournalMolecular and cellular biology
Issue number2
StatePublished - Feb 1990

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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