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- W1906156964 abstract "Abstract We report here that Hap1p (originally named Cyp1p) has an essential function in anaerobic or heme-deficient growth. Analysis of intragenic revertants shows that this function depends on the amino acid preceding the first cysteine residue of the DNA-binding domain of Hap1p. Selection of recessive extragenic suppressors of a hap1−hem1− strain allowed the identification, cloning, and molecular analysis of ASC1 (Cyp1 Absence of growth Supressor). The sequence of ASC1 reveals that its ORF is interrupted by an intron that shelters the U24 snoRNA. Deletion of the intron, inactivation of the ORF, and molecular localization of the mutations show unambiguously that it is the protein and not the snoRNA that is involved in the suppressor phenotype. ASC1, which is constitutively transcribed, encodes an abundant, cytoplasmically localized 35-kD protein that belongs to the WD repeat family, which is found in a large variety of eucaryotic organisms. Polysome profile analysis supports the involvement of this protein in translation. We propose that the absence of functional Asc1p allows the growth of hap1−hem1− cells by reducing the efficiency of translation. Based on sequence comparisons, we discuss the possibility that the protein intervenes in a kinase-dependent signal transduction pathway involved in this last function." @default.
- W1906156964 created "2016-06-24" @default.
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- W1906156964 date "1998-02-01" @default.
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- W1906156964 title "The Transcriptional Regulator Hap1p (Cyp1p) Is Essential for Anaerobic or Heme-Deficient Growth of Saccharomyces cerevisiae: Genetic and Molecular Characterization of an Extragenic Suppressor that Encodes a WD Repeat Protein" @default.
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- W1906156964 doi "https://doi.org/10.1093/genetics/148.2.559" @default.
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