Updated project metadata. "Here, we report the development of a novel version of Kinobeads that extends kinome coverage to PIKK and PI3K kinases. This is achieved by inclusion of two affinity probes derived from the clinical PI3K/MTOR inhibitors Omipalisib and BGT226. The new affinity matrix was used to profile 13 clinical and pre-clinical PIKK/PI3K inhibitors. The large discrepancies between the PI3K affinity values obtained and reported results from recombinant assays led us to perform a phosphoproteomic experiment showing that the chemoproteomic assay is the better approximation of PI3K inhibitor action in-vivo."