1887

Abstract

Mid2p is a plasma membrane protein that functions in as a sensor of cell wall stress, activating the cell integrity pathway via the small GTPase Rho1p during exposure to mating pheromone, calcofluor white, and heat. To examine Mid2p signalling, a global synthetic interaction analysis of a mutant was performed; this identified 11 interacting genes. These include and , upstream elements in cell integrity pathway signalling, and and , required for 1,3--glucan synthesis. These synthetic interactions indicate that the Wsc1p sensor acts through Rom2p to activate the Fks1p glucan synthase in a Mid2p-independent way. To further explore Mid2p signalling a two-hybrid screen was done using the cytoplasmic tail of Mid2p; this identified (), encoding a 12 kDa peripheral membrane protein that localizes to the plasma membrane. Disruption of leads to resistance to calcofluor white and to a Mid2p-dependent constitutive phosphorylation of Mpk1p, supporting a role for Zeo1p in the cell integrity pathway. Consistent with this, -deficient cells suppress the growth defect of mutants in the Rho1p GDP–GTP exchange factor Rom2p, while exacerbating the growth defect of Δ mutants at 37 °C. In contrast, Δ mutants have opposing effects to Δ mutants, being synthetically lethal with Δ, and suppressing an 18 °C growth defect of Δ, while overexpression of rescues a Δ 37 °C growth defect. Thus, and appear to play reciprocal roles in the modulation of the yeast cell integrity pathway.

Keyword(s): HA, haemagglutinin
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2003-09-01
2020-10-20
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