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- W4384697094 abstract "Abstract Ras is a small GTPase that is central to important functional decisions in diverse cell types. An important aspect of Ras signaling is its ability to exhibit bimodal, or switch-like activity. We describe the total reconstitution of a receptor-mediated Ras activation-deactivation reaction catalyzed by SOS and p120-RasGAP on supported lipid membrane microarrays. The results reveal a bimodal Ras activation response, which is not a result of classic kinetic bistability, but is rather driven by the distinct processivity of the Ras activator, SOS. Furthermore, the bimodal response is controlled by the condensation state of the scaffold protein, LAT, to which SOS is recruited. Processivity-driven bimodality leads to stochastic bursts of Ras activation even under strongly deactivating conditions. This behavior contrasts classic kinetic bistability and is distinctly more resistant to pharmacological inhibition." @default.
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- W4384697094 date "2023-07-17" @default.
- W4384697094 modified "2023-09-25" @default.
- W4384697094 title "Bimodality in Ras signaling originates from processivity of the Ras activator SOS without classic kinetic bistability" @default.
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- W4384697094 doi "https://doi.org/10.1101/2023.07.17.549263" @default.
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