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Applied Microbiology and Biotechnology

, Volume 94, Issue 1, pp 173–184 | Cite as

Ixr1p and the control of the Saccharomyces cerevisiae hypoxic response

  • Ángel Vizoso-Vázquez
  • Mónica Lamas-Maceiras
  • Manuel Becerra
  • M. Isabel González-Siso
  • Esther Rodríguez-Belmonte
  • M. Esperanza CerdánEmail author
Applied genetics and molecular biotechnology

Abstract

In Saccharomyces cerevisiae, adaptation to hypoxia/anaerobiosis requires the transcriptional induction or derepression of multiple genes organized in regulons controlled by specific transcriptional regulators. Ixr1p is a transcriptional regulatory factor that causes aerobic repression of several hypoxic genes (COX5B, TIR1, and HEM13) and also the activation of HEM13 during hypoxic growth. Analysis of the transcriptome of the wild-type strain BY4741 and its isogenic derivative Δixr1, grown in aerobic and hypoxic conditions, reveals differential regulation of genes related not only to the hypoxic and oxidative stress responses but also to the re-adaptation of catabolic and anabolic fluxes in response to oxygen limitation. The function of Ixr1p in the transcriptional regulation of genes from the sulfate assimilation pathway and other pathways producing α-keto acids is of biotechnological importance for industries based on yeast-derived fermentation products.

Keywords

Transcriptional regulation Oxidative stress Sulfate assimilation pathway 

Notes

Acknowledgments

This research was supported by grants BFU2006-03961 and BFU2009-08854 from MICINN (Spain), co-financed by FEDER (CEE). General support to the laboratory during 2008-11 was funded by Xunta de Galicia (Consolidación C.E.O.U.2008/008), co-financed by FEDER. A.V’s salary was funded by the “Lucas-Labrada program-2008” from Xunta de Galicia.

Supplementary material

253_2011_3785_MOESM1_ESM.doc (2.8 mb)
ESM 1 (DOC 2821 kb)
253_2011_3785_MOESM2_ESM.ppt (235 kb)
Fig. S1 Cluster analysis of DEGs included in ESM Table S1 (a), ESM Table S2 (b), and ESM Table S3 (c) with Genespring. The values analyzed are the means of significant changes in expression obtained from independent cultures as described in the experimental design in “Materials and methods.” The genes that are above the median of the normalized values between the different samples are shown in red and those below shown in blue. The color intensity is proportional to the normalized values, as shown on the scale at the bottom of the figure. Cells were grown under normoxia (a), hypoxia (b), or after a hypoxic sift (c) (PPT 235 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Ángel Vizoso-Vázquez
    • 1
  • Mónica Lamas-Maceiras
    • 1
  • Manuel Becerra
    • 1
  • M. Isabel González-Siso
    • 1
  • Esther Rodríguez-Belmonte
    • 1
  • M. Esperanza Cerdán
    • 1
    Email author
  1. 1.Departamento de Biología Celular y Molecular, F. CienciasUniversidad de A CoruñaCoruñaSpain

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