1887

Abstract

In , genes comprise a family of five paralogous genes. Previously, it has been shown that in the cell the gene products are organized into two interacting complexes, one of which is a heterodimer and the other a heterotrimer. Here, it has been demonstrated that in addition to supplying the cell with the key metabolic intermediate PRPP [5-phospho--ribosyl-1()-pyrophosphate], the gene products contribute to the maintenance of cell integrity. Specifically, the phosphorylation of Rlm1, one of the end points of the cell integrity signalling pathway, is significantly impaired following deletion of any one of the genes, in particular and . This is reflected in changes in the expression of the alternative 1,3--glucan synthase catalytic subunit, Fks2, as measured by its promoter activity. Yeast two-hybrid analysis has shown that Prs1, specifically the non-homologous region, NHR1-1 and Prs3, and to a lesser extent Prs2 and Prs4, interact with the MAPK (mitogen-activated protein kinase) of the cell integrity pathway, Slt2. When is lacking, the basal level of phosphorylation of Slt2 is increased. Furthermore, Δ and Δ strains have an increased chitin content under normal growth conditions. -Factor sensitivity and Calcofluor White resistance associated with the lack of Prs1 and Prs3 corroborate the involvement of these two gene products in cell integrity signalling. It is postulated that Prs polypeptides play a significant role in the remodelling of the cell wall and may have a direct involvement in cell integrity signalling.

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2004-10-01
2019-11-19
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