Update information. MpSTE1 mediates the phosphoylation of downstream proteins which control hyphal branching in M. purpureus. The phosphoproteomes of the wild-type (WT) and ΔmpSTE1 strains were compared to pinpoint proteins specifically phosphorylated in an MpSTE1-dependent manner. Since the gene mpSTE1 was disrupted in the mutant, its targets should not undergo phosphorylation compared to the WT strain. The data were filtered for phosphorylated peptides present in all WT replicates but absent in all ΔmpSTE1 replicates.