The inframe deletion of lysine residue at position 549 in the iSH2 domain of PIK3R1 relieves inhibition of PI3K catalytic subunit PIK3CA and enables constitutive activity of PI3K complex that contains PIK3R1 K549del mutant (Urick et al. 2011).
Urick, ME, Rudd, ML, Godwin, AK, Sgroi, D, Bell, DW, Merino, M
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