Abstract
New work shows that activation of the Ras guanine nucleotide exchange factor SOS is dependent upon the membrane density of phosphatidylinositol-4,5-bisphosphate (PIP2) and GTP-bound Ras. These signals synergize to release the autoinhibitory DH-PH domain, while the histone domain fine-tunes SOS activation in response to PIP2.
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