Falcon deep research report on wsc1 (S. pombe)
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Wsc1 is a plasma-membrane/cell-surface cell wall stress sensor-like protein that maintains cell wall integrity under stress by coupling extracellular wall status to intracellular signaling, functioning by activating the GTPase Rho1.
"Wsc1 is a plasma-membrane/cell-surface, cell wall stress sensor-like protein** implicated in maintaining cell wall integrity under stress by coupling extracellular wall status to intracellular signaling"
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Wsc1 and Mtl2 single deletions are individually viable but the double deletion is lethal, with lethality rescued by overexpression of Rho1 or its GEFs, placing both sensors functionally upstream of Rho1 activation.
"wsc1Δ** and **mtl2Δ** are individually viable, but **wsc1Δ mtl2Δ** is lethal; this lethality is **rescued by overexpression of Rho1 or its GEFs**, placing Wsc1/Mtl2 functionally upstream of Rho1 activation"
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Wsc1 interacts with the Rho-GEF Rgf2 and its overexpression activates cell wall biosynthesis, consistent with a Wsc1 to Rgf2 to Rho1 axis stimulating glucan synthase.
"Wsc1 **interacts with the Rho-GEF Rgf2**, and **Wsc1 overexpression activates cell wall biosynthesis**, consistent with a Wsc1 → Rgf2 → Rho1 axis"
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Pmk1/CIP MAPK activity is not markedly reduced in wsc1-delta or mtl2-delta cells under cell wall stress, supporting partially MAPK-independent roles for these sensors.
"CIP/Pmk1 activity is not markedly reduced in their absence**, supporting partially MAPK-independent roles for these sensors"
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A fission-yeast review describes Wsc1 as a plasma membrane-associated, serine-rich cell wall mechanosensor localized at active growth sites and the division septum, proposed to detect mechanical stress associated with growth and wall remodeling.
"plasma membrane-associated, serine-rich cell wall “mechanosensor”**, localized at active growth sites and the division septum, proposed to detect mechanical stress associated with growth and wall remodeling"
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Expert review synthesis frames Wsc1 as a mechanosensing module that can form stable clusters acting as signaling platforms at sites of mechanical stress, feeding into Rho1-centered control of cell wall homeostasis.
"Wsc1 as a **mechanosensing module** that can form **stable clusters** acting as signaling platforms at sites of mechanical stress, feeding into Rho1-centered control of cell wall homeostasis"