The substitution of asparagine residue with lysine at position 564 in the iSH2 domain of PIK3R1 relieves inhibition of PI3K catalytic subunit PIK3CA and enables constitutive activity of PI3K complex that contains PIK3R1 N654K mutant (Sun et al. 2010).
Hofmann, BT, Hillmann, P, Vogt, PK, Sun, M, Hart, JR
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