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RAM pathway contributes to Rpb4 dependent pseudohyphal differentiation in Saccharomyces cerevisiae

Verma-Gaur, Jiyoti and Deshpande, Swati and Sadhale, Parag P (2008) RAM pathway contributes to Rpb4 dependent pseudohyphal differentiation in Saccharomyces cerevisiae. In: Fungal Genetics and Biology, 45 (10). pp. 1373-1379.

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Rpb4, a subunit of RNA Polymerase II plays an important role in various stress responses in budding yeast, Saccharomyces cerevisiae. In response to nitrogen starvation, diploid yeast undergoes a dimorphic transition to filamentous pseudohyphal growth, which is regulated through cAMP-PKA and MAP kinase pathway.In the present study, we show that disruption of Rpb4 leads to enhanced pseudohyphal growth,which is independent of nutritional status. We observed that the rpb4D/rpb4D cells exhibit pseudohyphae even in the absence of functional MAP kinase and cAMP-PKA pathways. Genome-wide expression profiling showed that in the absence of Rpb4 several genes controlling mother daughter cell separation are down regulated. Our genetic studies also provide evidence for involvement of RNA Pol II subunit Rpb4 in the expression of genes downstream of the RAM pathway. Finally, we show that this effect on expression of RAM pathway may at least be partially responsible for the pseudohyphal phenotype of rpb4 \delta /rpb4 \delta cells.

Item Type: Journal Article
Publication: Fungal Genetics and Biology
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Rpb4;RNA polymerase II;Saccharomyces cerevisiae;Pseudohyphal morphogenesis;RAM pathway;Ace2.
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 22 May 2009 05:40
Last Modified: 19 Sep 2010 04:53
URI: http://eprints.iisc.ac.in/id/eprint/16770

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