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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Rox3 and Rts1 function in the global stress response pathway in baker's yeast.

Yeast respond to a variety of stresses through a global stress response that is mediated by a number of signal transduction pathways and the cis-acting STRE DNA sequence. The CYC7 gene, encoding iso-2-cytochrome c, has been demonstrated to respond to heat shock, glucose starvation, approach-to-stationary phase, and, as we demonstrate here, to osmotic stress. This response was delayed in a the hog1-delta 1 strain implicating the Hog1 mitogen-activated protein kinase cascade, a known component of the global stress response. Deletion analysis of the CYC7 regulatory region suggested that three STRE elements were each capable of inducing the stress response. Mutations in the ROX3 gene prevented CYC7 RNA accumulation during heat shock and osmotic stress. ROX3 RNA levels were shown to be induced by stress through a novel regulatory element. A selection for high-copy suppressors of a ROX3 temperature-sensitive allele resulted in the isolation of RTS1, encoding a protein with homology to the B' regulatory subunit of protein phosphatase 2A0. Deletion of RTS1 caused temperature and osmotic sensitivity and increased accumulation of CYC7 RNA under all conditions. Over-expression of this gene caused increased CYC7 RNA accumulation in rox3 mutants but not in wild-type cells.[1]


  1. Rox3 and Rts1 function in the global stress response pathway in baker's yeast. Evangelista, C.C., Rodriguez Torres, A.M., Limbach, M.P., Zitomer, R.S. Genetics (1996) [Pubmed]
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