Figure 5.
Phosphorylation of PrkD by PrkC and HprK/P. (A) Identification of phosphorylated residues by mass spectrometry. Fragmentation spectra are shown for the three modified peptides, bearing the residues threonine 213, threonine 241, and serine 243 phosphorylated by PrkC, and serine 148 phosphorylated by HprK/P. (B) Mapping of the phosphorylated residues on the structural model of PrkD obtained by SWISS-MODEL (surface representation). The phosphorylated residues are shown in red. Residues in the activation loop are in blue, and the catalytic site is in yellow.