A system based network approach to ethanol tolerance in Saccharomyces cerevisiae

BMC Systems Biology

Betul Kirdar²  Ebru Toksoy Oner¹  Kazim Yalcin Arga¹  Serpil Eraslan²  Ceyda Kasavi² 

[1] Department of Bioengineering, Marmara University, Istanbul, Turkey;Department of Chemical Engineering, Boğaziçi University, Istanbul, Turkey

关键词: Protein-protein interaction network;    Saccharomyces cerevisiae;    Candidate genes;    Ethanol tolerance network;   

Others  :  1159580
DOI  :  10.1186/s12918-014-0090-6

 received in 2014-04-10, accepted in 2014-07-15,  发布年份 2014

【 摘 要 】

Background

Saccharomyces cerevisiae has been widely used for bio-ethanol production and development of rational genetic engineering strategies leading both to the improvement of productivity and ethanol tolerance is very important for cost-effective bio-ethanol production. Studies on the identification of the genes that are up- or down-regulated in the presence of ethanol indicated that the genes may be involved to protect the cells against ethanol stress, but not necessarily required for ethanol tolerance.

Results

In the present study, a novel network based approach was developed to identify candidate genes involved in ethanol tolerance. Protein-protein interaction (PPI) network associated with ethanol tolerance (tETN) was reconstructed by integrating PPI data with Gene Ontology (GO) terms. Modular analysis of the constructed networks revealed genes with no previously reported experimental evidence related to ethanol tolerance and resulted in the identification of 17 genes with previously unknown biological functions. We have randomly selected four of these genes and deletion strains of two genes (YDR307W and YHL042W) were found to exhibit improved tolerance to ethanol when compared to wild type strain.

The genome-wide transcriptomic response of yeast cells to the deletions of YDR307W and YHL042W in the absence of ethanol revealed that the deletion of YDR307W and YHL042W genes resulted in the transcriptional re-programming of the metabolism resulting from a mis-perception of the nutritional environment. Yeast cells perceived an excess amount of glucose and a deficiency of methionine or sulfur in the absence of YDR307W and YHL042W, respectively, possibly resulting from a defect in the nutritional sensing and signaling or transport mechanisms. Mutations leading to an increase in ribosome biogenesis were found to be important for the improvement of ethanol tolerance. Modulations of chronological life span were also identified to contribute to ethanol tolerance in yeast.

Conclusions

The system based network approach developed allows the identification of novel gene targets for improved ethanol tolerance and supports the highly complex nature of ethanol tolerance in yeast.

【 授权许可】

   
2014 Kasavi et al.; licensee BioMed Central

【 图 表 】

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