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Pressure-assisted digestion of proteins, also known as pressure cycling technology (PCT), using a Barocycler NEP 2320 was compared with the conventional method using atmospheric pressure. Our objective was to demonstrate that PCT provides more controlled enzymatic digestion of proteins than prolonged digestion at atmospheric pressure ranging from 18 to 24 h. More controlled digestion would be beneficial for studies of highly posttranslationally modified protein such as histones. For the comparison of these two techniques, recombinant and native histone H4 were used as model proteins. PCT was optimized for pressure and time, and it was found to be most effective at 15 kpsi for 120 min of incubation. In conclusion, the PCT method was found to be much faster than using atmospheric pressure. PCT was also found to allow for unambiguous control of digestion parameters and to provide a high yield of sequence coverage compared with atmospheric pressure.

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