PTMScan ® Trypsin, TPCK-Treated

Trypsin is chromatographically purified from bovine pancreas, treated with L-(tosylamido-2-phenyl) ethyl chloromethyl ketone (TPCK) to inhibit chymotryptic activity, 0.22 micron diafiltered against 1 mM HCl, and lyophilized.

Trypsin is a serine endopeptidase derived from its inactive pancreatic zymogen, trypsinogen, when the N-terminal 6 amino acid leader sequence is enzymatically removed. Activated trypsin cleaves amide and ester bonds of lysine and arginine and is used extensively in detaching cells from culture dishes, protein sequencing, and proteomics applications.

Product Usage Information

PTMScan® Trypsin-TPCK is provided for use with Cell Signaling Technology's patented PTMScan® protocol in the initial protein digestion step. Samples in urea lysis buffer need to be diluted to 2M or less urea prior to addition of trypsin. For a 1 mg/mL solution, dissolve 20 mg trypsin in 4 mL of 1 mM HCl prior to use. Transfer the 4 mL to a 50 mL conical tube and bring the volume up to 20 mL with 1 mM HCl. Aliquot and store at -80ºC. Consult the specific PTMScan® kit and protocol for more details on the appropriate protease before digesting any protein samples.

Specificity/Sensitivity