Complex of human p110α, also known as PIK3CA, GenBank Accession No. NM_006218, a.a. 2-1068(full length), with N345K mutation, with N-terminal His-tag, MW=111 kDa, and human p85α, also known as PIK3R1, GenBank Accession No. NM_181523, a.a. 1-724(full length), MW=85 kDa. Coexpressed in a Baculovirus infected Sf9 cell expression system.