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Overexpression of SNG1 causes 6-azauracil resistance in Saccharomyces cerevisiae

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Abstract

The mechanism of action of 6AU, a growth inhibitor for many microorganisms causing depletion of intracellular nucleotide pools of GTP and UTP, is not well understood. To gain insight into the mechanisms leading to 6AU resistance, and in an attempt to uncover novel genes required for this resistance, we undertook a high-copy-number suppressor screening to identify genes whose overexpression could repair the 6AUS growth defect caused by rpb1 mutations in Saccharomyces cerevisiae. We have identified SNG1 as a multicopy suppressor of the 6AUS growth defect caused by the S. cerevisiae rpb1 mutant. The mechanism by which Sng1 causes 6AU resistance is independent of the transcriptional elongation and of the nucleotide-pool regulation through Imd2 and Ura2, as well as of the Ssm1-mediated 6AU detoxification. This resistance to 6AU is not extended to other uracil analogues, such as 5-fluorouracil, 5FU. In addition, our results suggest that 6AU enters S. cerevisiae cells through the uracil permease Fur4. Our results demonstrate that Sng1 is localised in the plasma membrane and evidence SNG1 and FUR4 genes as determinants of resistance and susceptibility to this inhibitory compound, respectively. Taken together, these results show new mechanisms involved in the resistance and susceptibility to 6AU.

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Acknowledgments

We thank Dr. Jesús de la Cruz and Dr. Francisco Muñoz for critical discussion. We also thank Dr. Moye-Rowley, Dr. Kaplan and Dr. Sá-Correia for kindly gift of YRR1-1, PDR3, and AZR1 and FLR1 plasmids. This work was supported by grants of Ministry of Science and Technology (BFU2007-67575-C03-03/BMC, Spain) and Junta de Andalucía (BIO258, Spain). M.C. García López was a recipient of a fellowship from Universidad de Jaén-Junta de Andalucía (supported by grant BMC2003-07072-C03-03 from Ministry of Science and Technology, Spain) and M. C. Mirón-García is supported by grant of Ministry of Science and Technology (BFU2007-67575-C03-03/BMC, Spain).

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  1. Departamento de Biología Experimental, Facultad de Ciencias Experimentales, Universidad de Jaén, Paraje de las Lagunillas, s/n, 23071, Jaén, Spain

    Ma Carmen García-López, Ma Carmen Mirón-García, Ana I. Garrido-Godino, Carlos Mingorance & Francisco Navarro

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  1. Ma Carmen García-López
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  2. Ma Carmen Mirón-García
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  3. Ana I. Garrido-Godino
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  4. Carlos Mingorance
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  5. Francisco Navarro
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Correspondence to Francisco Navarro.

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Communicated by K. Kuchler.

M. C. García-López and M. C. Mirón-García have contributed equally to this work.

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García-López, M.C., Mirón-García, M.C., Garrido-Godino, A.I. et al. Overexpression of SNG1 causes 6-azauracil resistance in Saccharomyces cerevisiae . Curr Genet 56, 251–263 (2010). https://doi.org/10.1007/s00294-010-0297-z

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