Application
Trypsin Sequencing Grade is used to to digest proteins in solution, in gels or on blotting membranes.The enzyme is used for protein-structure elucidation, tryptic mapping, fingerprinting, sequence analysis, and translocation studies. Trypsin Sequencing Grade generates glycopeptides from purified glycoproteins and is suited for the digestion of proteins in polyacrylamide gels.
General description
Trypsin Sequencing Grade is isolated from bovine pancreas as a highly purified and specific protease. Trypsin Sequencing Grade is a serine endopeptidase. It specifically cleaves peptide bonds at the carboxylic side of the basic amino acids Arg and Lys. Amide and ester bonds of Arg and Lys are also cleaved.
Other Notes
For life science research only. Not for use in diagnostic procedures.
Preparation Note
Stabilizers: Trypsin is stable in 4 M.Working concentration: 1/100 to 1/20 of the protein by weight (in solution); 1-5 µg/100 µl (for in-gel digest)Storage conditions (working solution): A solution in 0.01% trifluoroacetic acid (TFA), (v/v) or 1 mM HCl may be used for one week at maximum, if stored at 2 to 8 °C. By incubation of proteins in solution at neutral to slightly basic pH-values partial autolysis might occur. For this application, Roche recommends Trypsin, Modified, Sequencing Grade.
Quality
Purity: Free of impurities that may interfere with the separation of peptides in reversed-phase HPLC.
Reconstitution
Reconstitution in acid is necessary for stability of solution: 0.01% TFA (v/v), 1 mM HCl or 0.1% acetic acid are recommended.
Specificity
The specificity of Trypsin Sequencing Grade is verified with the oxidized B-chain of insulin (insulin Box) as substrate. High concentrations of Trypsin Sequencing Grade (1 part by weight enzyme with 18 parts by weight insulin Box) are incubated for 18 hours to detect traces of chymotrypsin impurities.Specificity (HPLC, with Insulin Box):Cleavage after 1 hour: ≥90%;Unspecific cleavage products after 18 hours: ≤10%
This product has met the following criteria: