(a) Digestion
of CytC by EndoPro or AEX fractions at pH 4 incubated
for different times (i.e., 0, 15, 30, 60, 90, 120, 200, 300, and 480
min). The y-axis represents the relative density
of the band of the undigested CytC and the x-axis
the incubation time of the protease with CytC at 37 °C. The gel
of digestion with EndoPro is shown in Figure S9. (b) The cleavage specificity of EndoPro and AEX fractions at pH
2 (upper part) and pH 4 (lower part). The x-axis
shows the C-terminal amino acids of the BSA peptides generated by
protease digestion. The data is a mean percentage (n = 4) of total cleavages of BSA per protease. The error bars show
standard deviations. See the Experimental Section for details on the experimental procedure. (c) An example of C-terminal
ragging for peptide “FDEHVKLVNELTEFAKTCVADESHAG”.
The color indicates the relative number of PSMs detected for this
peptide.