Table II

Comparison of detected E. coli phosphoproteome with published B. subtilis phosphoproteome4

This comparison shows similarity in size, distribution of Ser/Thr/Tyr phosphorylation sites, and increased proportion of essential proteins.

Genome size (ORFs)No. of phosphoproteinsNo. of detected phosphorylation eventspS (%)pT (%)pY (%)Essential genes (%)Essential phosphoproteins (%)
E. coli ∼43007910567.923.58.617>27
B. subtilis ∼41007810369.220.510.36.615.4