C. Human protein kinases phosphorylate large sets of yeast proteins. Upper panel: In total, 27 human protein kinases showed activity towards yeast proteins visible on western blots through enhanced reactivity with phospho-motif antibodies on yeast proteins in comparison to other human kinases, kinase‑dead mutant versions or vector control samples. Commercially available pS/T-antibodies with relatively low sequence specificities were chosen to enable detection of phosphorylation of the yeast proteome by human kinases. Lower panel: Examples of western blots with equal amount of whole yeast cell lysate from strains expressing human kinases loaded. When developed with the indicated phospho-motif recognizing antibodies, immunoreactive bands indicated phosphorylation of yeast proteins. 