The binding landscape of Ras/effector interactions provides insights on Ras switching and oncogenesis

RasG12D reshapes the Ras–Nore1A binding landscape, uncovering many Nore1A variants with enhanced and selective affinity for mutant Ras, unlike RasWT and GTP hydrolysis.

• Why it matters: Signaling PPIs must balance specificity and adaptability, but how oncogenic mutations rewire interaction landscapes—and how that knowledge can guide inhibitor design—remains unclear.
• What they did: Using yeast surface display and deep mutational scanning, the authors screened ~33,000 Nore1A single and double mutants against RasWT and RasG12D in GTP- and GDP-bound states, then normalized binding data.
• The result: Most Nore1A mutations modestly reduce affinity, few increase it; GTP hydrolysis causes minimal landscape change, while RasG12D drives extensive remodeling, supported by MD simulations linking effects to altered RasG12D and Nore1A flexibility.

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