Recombinant Human PIK3CA[1-1068(end) amino acids of accession number NP_006209.2] was coexpressed as N-terminal DYKDDDDK tagged, biotinylated protein (128 kDa) with PIK3R1[1-724(end) amino acids of accession number NP_852664.1] in insect cell and biotinyl
50 mM Tris-HCl, 150 mM NaCl, 0.05% Brij35, 1 mM DTT, 10% glycerol, pH7.5
>90% as determined by SDS-PAGE and CBB staining
Store at -80 centigrade. Aliquot to avoid repeated freezing and thawing.