The inframe deletion of amino acid residues at position 463 to 466 in the iSH2 domain of PIK3R1 relieves inhibition of PI3K catalytic subunit PIK3CA and enables constitutive activity of PI3K complex that contains PIK3R1 Y463_L466del mutant (Urick et al. 2011).
Urick, ME, Rudd, ML, Godwin, AK, Sgroi, D, Bell, DW, Merino, M
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