T9128

Trypsin inhibitor

lyophilized powder, suitable for inhibition assay

• Synonym(s): SBTI
• CAS Number: 9035-81-8
• EC Number: 232-906-9
• MDL number: MFCD00082103
• UNSPSC Code: 12352202
• NACRES: NA.77

Properties

• product name: Trypsin inhibitor from Glycine max (soybean), lyophilized powder
• biological source: Glycine max (soybean)
• type: Type II-S
• form: lyophilized powder
• mol wt: 20,100 Da
• technique(s): inhibition assay: suitable
• solubility: balanced salt solution: 1 mg/mL; concentrate: >10 mg/mL, hazy, amber-yellow; phosphate buffer: 10 mg/mL; water: 10 mg/mL; serum-free medium: soluble
• shipped in: ambient
• storage temp.: 2-8°C

Description

Biochem/physiol Actions

This inhibitor acts against trypsin, and chymotrypsin and plasmin to a lesser extent. It will also inhibit proteases with mechanisms similar to trypsin, plasma kallikrein and coagulation Factor X. The trypsin inhibitor will not act against metalloproteases, tissue-baseed kallikrein, acid proteases, or thio proteases. This inhibitor acts by forming a 1:1 stoichiometric complex with the protease active site, and then cleaving a single arginine-isoleucine bond on the inhibitor. The inhibition is both reversible and pH dependent.

Components

The soybean trypsin inhibitor is a monomeric protein containing 181 amino acid residues in a single polypeptide chain crosslinked by two disulfide bridges.

Unit Definition

One trypsin unit = A₂₅₃ of 0.001 per minute with N-alpha-benzoyl-L-arginine ethyl ester (BAEE) as substrate at pH 7.6 at 25 °C.

One trypsin unit will produce a ΔA₂₅₃ of 0.001 per min with BAEE as substrate at pH 7.6 at 25 °C; reaction volume 3.2 ml, 1 cm light path.

Preparation Note

The trypsin inhibitor is soluble in water and phosphate buffers at 10 mg/mL. It is soluble in balanced salt solutions at 1 mg/mL and in serum-free media. Concentrated solutions greater than 10 mg/mL may be hazy and have a yellow to amber color. After trypsinizing cells, resuspend in 1 mL trypsin inhibitor solution at 1 mg/mL for every mL of trypsin solution used for dissociation. The cell suspension should then be centrifuged at 1000 rpm, forming a cell pellet.

Solutions can retain activity when stored short-term at 2-8° C. Solutions are stable in frozen aliquots at -20°C.

Analysis Note

One mg of trypsin inhibitor will inhibit a minimum of 1.0 mg Trypsin of activity ~10,000 BAEE units/mg trypsin.

Safety Information

• Pictograms: GHS08
• Signal Word: Danger
• Hazard Statements: H317,H334
• Precautionary Statements: P261 - P272 - P280 - P284 - P302 + P352 - P333 + P313
• Hazard Classifications: Resp. Sens. 1 - Skin Sens. 1
• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves