The inframe deletion of amino acid residues at position 574 to 576 in the iSH2 domain of PIK3R1 relieves inhibition of PI3K catalytic subunit PIK3CA and enables constitutive activity of PI3K complex that contains PIK3R1 R574_T576del mutant (Urick et al. 2011).
Urick, ME, Rudd, ML, Godwin, AK, Sgroi, D, Bell, DW, Merino, M
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