Soybean trypsin inhibitor is a mixture of the three types. We have not characterized our trypsin inhibitor products in terms of how much of each of the three types may be present. All three have a molecular weight of between 20,000 and 20,200 daltons, so one might use 20,100 daltons as an average.The three types vary in the amino acids at a few positions. The detailed summary of the three types (or variants) was published in the following linked reference: J. Biochem. (Japan), 98, 435-448 (1985).Note that the authors use Tia, Tib and Tic to indicate the three variants.
T1021
Trypsin inhibitor
powder, suitable for isoelectric focusing (IEF)
Synonym(s):
SBTI
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| Size/SKU | Availability | Price |
|---|---|---|
1 vial | Check Cart for Availability | $52.50 |
About This Item
$52.50
Check Cart for Availability
Product Name
Trypsin inhibitor from Glycine max (soybean), Isoelectric focusing marker, pI 4.6
biological source
Glycine max (soybean)
Quality Segment
form
powder
mol wt
20,100 Da
technique(s)
isoelectric focusing (IEF): suitable
input
plant, fungi and insect sample(s)
pI
4.6
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.
−20°C
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.
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.
Solutions can retain activity when stored short-term at 2-8° C. Solutions are stable in frozen aliquots at -20°C.
Other Notes
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.
The soybean trypsin inhibitor is a monomeric protein containing 181 amino acid residues in a single polypeptide chain crosslinked by two disulfide bridges.
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This Item | |||
|---|---|---|---|
| description Isoelectric focusing marker, pI 4.6 | description BioReagent, For use as a marker in SDS-PAGE | description lyophilized powder, ~10000 U/mg | description solution, sterile-filtered, suitable for, suitable for cell culture |
| biological source Glycine max (soybean) | biological source Glycine max (soybean) | biological source Glycine max (soybean) | biological source Glycine max (soybean) |
| Quality Level 200 | Quality Level 200 | Quality Level 100 | Quality Level 100 |
| form powder | form powder | form lyophilized powder | form solution |
| shipped in ambient | shipped in ambient | shipped in wet ice | shipped in dry ice |
| storage temp. −20°C | storage temp. 2-8°C | storage temp. −20°C | storage temp. −20°C |
| solubility balanced salt solution: 1 mg/mL, phosphate buffer: 10 mg/mL, serum-free medium: soluble, concentrate: >10 mg/mL, hazy, amber-yellow, water: 10 mg/mL | 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 | solubility 0.1 M phosphate pH 7.6: 5 mg/mL, clear, colorless to almost colorless | 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 |
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