Oncogenic mutations of PIK3CA lead to increased membrane recruitment driven by reorientation of the ABD, p85 and C-terminus
[Paper-level Aggregated] PMCID: PMC9837058
Evidence Type(s): Functional
Summary: Mutation: D915N | Summary: The D915N mutation is described as a kinase dead mutation that does not cause significant changes in protein conformation or membrane binding, indicating its role in altering molecular function without affecting these properties.
Evidence Type: Functional Mutation: N345K | Summary: The N345K mutation in p110alpha is associated with altered membrane binding properties, as evidenced by HDX-MS experiments showing protection in specific regions of the protein when interacting with membranes, indicating a change in molecular function related to membrane association.
Evidence Type: Functional Mutation: E726K | Summary: The E726K mutation alters molecular or biochemical function, particularly in relation to the disengagement of the ABD and p85 from the catalytic core, suggesting conformational changes associated with this mutation.
Evidence Type: Functional Mutation: H1047R | Summary: The H1047R mutation alters molecular function by enhancing membrane binding and increasing basal ATPase activity. It is associated with alterations in molecular or biochemical function, as indicated by the analysis of perturbations in conformation observed in HDX-MS experiments, and shows unique differences in binding interactions upon pY binding.
Evidence Type: Functional Mutation: His1047 | Summary: His1047 is involved in extensive interactions within the kinase domain, indicating that it plays a role in the molecular function of the protein.
Evidence Type: Functional Mutation: Met1043 | Summary: Met1043 is mentioned as a hydrophobic residue that contributes to the structural integrity of the kinase domain, suggesting its role in the molecular function of the protein.
Evidence Type: Functional Mutation: G1049R | Summary: The G1049R mutation alters molecular function by enhancing membrane binding and increasing basal ATPase activity. It shows significantly increased ATPase activity compared to wild type, indicating an alteration in molecular function.
Evidence Type: Functional Mutation: M1043L | Summary: The M1043L mutation alters molecular function by increasing basal ATPase activity with a limited effect on membrane binding. It demonstrates significantly increased ATPase activity compared to wild type and is described in the context of kinase activity.
Evidence Type: Functional Mutation: N1068fs | Summary: The N1068fs mutation alters molecular function by increasing membrane binding without affecting basal ATPase activity and is described in the context of being a kinase dead variant.
Gene→Variant (gene-first): PIK3CA(5290):D915N PIK3CA(5290):N345K PIK3CA(5290):E726K PIK3CA(5290):H1047R PIK3CA(5290):His1047 PIK3CA(5290):Met1043 PIK3CA(5290):G1049R PIK3CA(5290):M1043L PIK3CA(5290):N1068fs
Genes: PIK3CA(5290)
Variants: D915N N345K E726K H1047R His1047 Met1043 G1049R M1043L N1068fs