Product Name

Trypsin from bovine pancreas

Assay

Type I, ~10,000 BAEE units/mg protein; protein, 90-100%

CAS Number

9002-07-7

Molecular Weight

mol wt 23.8 kDa

MDL number

MFCD00082094

Suitability

BioReagent

l Physical and Chemical Information

Appearance

solid

Solubility(25°C)

hydrochloric acid: soluble 1 mM, clear

l Biological Information

Biochem/Physiol Actions

Trypsin cleaves peptides on the C-terminal side of lysine and arginine residues. The rate of hydrolysis of this reaction is slowed if an acidic residue is on either side of the cleavage site and hydrolysis is stopped if a proline residue is on the carboxyl side of the cleavage site. The optimal pH for trypsin activity is 7-9. Trypsin can also act to cleave ester and amide ages of synthetic derivatives of amino acids. EDTA is added to trypsin solutions as a chelating agent that neutralizes calcium and magnesium ions that obscure the peptide bonds on which trypsin acts. Removing these ions increases the enzymatic activity. Serine protease inhibitors, including DFP, TLCK, APMSF, AEBSEF, and aprotinin, amongst others, will inhibit Trypsin.

Application

For trypsin digestion of peptides, use a ratio of about 1:100 to 1:20 for trypsin:peptide. The typical use for this product is in removing adherent cells from a culture surface. The concentration of trypsin necessary to dislodge cells from their substrate is dependent primarily on the cell type and the age of the culture. Trypsins have also been used for the re-suspension of cells during cell culture, in proteomics research for digestion of proteins and in various in-gel digestions. Additional applications include assessing crystallization by membrane-based techniques and in a study to determine that protein folding rates and yields can be limited by the presence of kinetic traps.

Preparation Note

Soluble in 1 mM HCl at 1 mg/mL.

Caution

Solutions in 1 mM HCl are stable for 1 year in aliquots and stored at -20°C. The presence of Ca₂₊ will also diminish the self-autolysis of trypsin and maintain its stability in solution. Trypsin will also retain most of its activity in 2.0 M urea, 2.0 M guanidine HCl, or 0.1% (w/v) SDS.

Unit Definition

One BAEE unit will produce a A²⁵³ of 0.001 per minute at pH 7.6 at 25°C using BAEE as a substrate. One BTEE unit = 320 ATEE units

l Storage

Storage temp.

-20°C

l Precautions and Disclaimer

This product is for R&D use only, not for drug, household, or other uses.

l References

1. http://www.drugbank.ca

2. https://ncit.nci.nih.gov

3. https://www.ncbi.nlm.nih.gov