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C7762
α-Chymotrypsin from bovine pancreas
Type I-S, essentially salt-free, lyophilized powder
Sinónimos:
α-chymotrypsin A and B, alpha-chymotrypsin
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Número CAS:
UNSPSC Code:
12352204
eCl@ss:
42010112
EC Number:
232-671-2
NACRES:
NA.54
MDL number:
Specific activity:
≥40 units/mg protein
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Type I-S
Quality Segment
form
essentially salt-free, lyophilized powder
specific activity
≥40 units/mg protein
mol wt
25 kDa
purified by
3× crystallization
solubility
1 mM HCl: soluble 2.0 mg/mL, clear
UniProt accession no.
storage temp.
−20°C
Gene Information
cow ... CTRB1(618826)
Application
α-Chymotrypsin from bovine pancreas has been used in a study to investigate protein extraction by Winsor-III microemulsion systems. α-Chymotrypsin from bovine pancreas has also been used in a study to investigate a new specific fullerene-based fluorescent probe for trypsin.
The product has been used to investigate the inhibitory effect of several ether oligomers against the enzyme.[1] It has also been used to cleave pro-phenoloxidase in order to estimate total phenoloxidase in haemolymph.[2] Furthermore, the enzyme has been used as a positive control in chymotrypsin assays using salivary gland and anterior midgut extracts of Deraeocoris nigritulus.
Biochem/physiol Actions
α-Chymotrypsin is a serine peptidase and has 241 amino acid residues contained in three polypeptide chains (A chain-13 residues, B chain-131 residues, and C chain-97 residues) linked by disulfide bridges. Molecular weight of this enzyme is found to be 25 kDa. The pI is 8.75. It selectively hydrolyzes peptide bonds on the C-terminal side of tyrosine, phenylalanine, tryptophan, and leucine. Ca2+ activates and stabilizes the enzyme. The enzyme is inhibited by diisopropyl fluorophosphate (DFP), phenylmethanesulfonyl fluoride (PMSF), N-p-tosyl-L-phenylalanine chloromethyl ketone (TPCK), chymostatin, aprotinin, α1-antitrypsin, and α2-macroglobulin, as well as 10 mM of Cu2+ and Hg2+.
A serine protease that hydrolyzes peptide bonds with aromatic or large hydrophobic side chains (Tyr, Trp, Phe, Met, Leu) on the carboxyl end of the bond.
Preparation Note
Prepared free of autolysis products and low molecular weight contaminants.
The powder may be reconstituted in 1 mM HCl at 2 mg/mL concentration to form a clear solution.
Analysis Note
Minimum 85% protein
Protein determined by E1%/280
Other Notes
One unit will hydrolyze 1.0 μmole of BTEE per min at pH 7.8 at 25 °C.
View more information on chymotrypsin at www.sigma-aldrich.com/enzymeexplorer
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Este artículo | |||
|---|---|---|---|
| Gene Information cow ... CTRB1(618826) | Gene Information cow ... CTRB1(618826) | Gene Information cow ... CTRB1(618826) | Gene Information cow ... CTRB1(618826) |
| specific activity ≥40 units/mg protein | specific activity - | specific activity ≥40 units/mg protein | specific activity ≥40 units/mg protein |
| form essentially salt-free, lyophilized powder | form salt-free, lyophilized powder | form essentially salt-free, lyophilized powder | form lyophilized powder |
| UniProt accession no. | UniProt accession no. | UniProt accession no. | UniProt accession no. |
| storage temp. −20°C | storage temp. 2-8°C | storage temp. −20°C | storage temp. −20°C |
| mol wt 25 kDa | mol wt 25 kDa | mol wt 25 kDa | mol wt 25 kDa |
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signalword
Danger
Hazard Classifications
Acute Tox. 4 Oral - Aquatic Acute 1 - Eye Irrit. 2 - Resp. Sens. 1 - Skin Irrit. 2 - STOT SE 3
target_organs
Respiratory system
Clase de almacenamiento
11 - Combustible Solids
wgk
WGK 1
ppe
dust mask type N95 (US), Eyeshields, Faceshields, Gloves
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What is the Department of Transportation shipping information for this product?
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How can solutions of α-Chymotrypsin, Product C7762, be stored?
1 answer-
Stock solutions prepared in 1 mM HCl, containing 2 mM calcium chloride can be stored at -20 °C for about one week.
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What is the molecular weight of alpha-chymotrypsin from bovine pancreas (Product No. C7762)?
1 answer-
The molecular weight of alpha chymotrypsin, reported in the literature, is approximately 25 kDa. This information and the basic structure description of the enzyme can be found on our product information sheet (under Documents, above).
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What is the pH optimum for the enzyme, α-Chymotrypsin, Product C7762?
1 answer-
The pH optimum is between pH 7.5-8.5.
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How should I prepare a solution of α-Chymotrypsin, Product C7762?
1 answer-
It is recommended to reconstitute product C7762 in 1 mM hydrochloric acid containing 2 mM calcium chloride. The calcium functions as both a stabilizer (and possibly an activator) of the enzyme.
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