Updated project metadata. Staphylococcus aureus is the leading cause of infections worldwide and infection results in a variety of diseases. As of no surprise, phosphorylation is a major game player in signaling cascades and has been shown to be involved in S. aureus virulence. Albeit long neglected, eukaryotic-like serine/threonine kinases have been implicated in these complex signaling cascades. Due to the sub-stoichiometric nature of protein phosphorylation and a lack of suitable analysis tools, the knowledge of these cascades is however, to date, still limited. Here, were apply an optimized protocol for efficient phosphopeptide enrichment via Fe3+-IMAC followed by LC-MS/MS to get a better understanding of the impact of protein phosphorylation on the complex signaling networks involved in pathogenicity. By profiling a serine/threonine kinase and phosphatase mutant from a methicillin-resistant S. aureus mutant library, we generated the most comprehensive phosphoproteome dataset of S. aureus to date, aiding a better understanding of signaling in bacteria.