P8415

Peroxidase from horseradish

Type XII, essentially salt-free, lyophilized powder, ≥250 units/mg solid (using pyrogallol)

• Szinonimák: Donor:hydrogen-peroxide oxidoreductase, Horseradish peroxidase
• CAS-szám: 9003-99-0
• Enzyme Commission szám: 1.11.1.7 (BRENDA, IUBMB)
• EC-szám: 232-668-6
• MDL-szám: MFCD00071339
• UNSPSC kód: 12352204
• NACRES: NA.54

Tulajdonságok

• típus: Type XII
• Minőségi szint: 200
• Forma: essentially salt-free, lyophilized powder
• specifikus aktivitás: ≥250 units/mg solid (using pyrogallol)
• molekulatömeg: ~44 kDa
• oldhatóság: 0.1 M phosphate buffer: soluble (pH 6.0); H₂O: soluble
• abszorbancia arány: RZ ≥3.0
• tárolási hőmérséklet: 2-8°C
• SMILES string: [O+H2]O[O-]
• InChI: 1S/H2O3/c1-3-2/h1-2H
• Nemzetközi kémiai azonosító kulcs: JSPLKZUTYZBBKA-UHFFFAOYSA-N

Leírás

Általános leírás

HRP is a single chain polypeptide containing four disulfide bridges. It is a glycoprotein containing 18% carbohydrate. The carbohydrate composition consists of galactose, arabinose, xylose, fucose, mannose, mannosamine, and galactosamine depending upon the specific isozyme. Its molecular weight (~44 kDa) includes the polypeptide chain (33,890 Daltons), hemin plus Ca²⁺ (~700 Daltons), and carbohydrate (~9,400 Daltons). At least seven isozymes of HRP exist. The isoelectric point for horseradish peroxidase isozymes ranges from 3.0 - 9.0.

Horseradish peroxidase is isolated from horseradish roots (Amoracia rusticana) and belongs to the ferroprotoporphyrin group of peroxidases. HRP is a single chain polypeptide containing four disulfide bridges. It is a glycoprotein containing 18% carbohydrate. The carbohydrate composition consists of galactose, arabinose, xylose, fucose, mannose, mannosamine, and galactosamine depending upon the specific isozyme. Its molecular weight (~44 kDa) includes the polypeptide chain (33,890 Daltons), hemin plus Ca²⁺ (~700 Daltons), and carbohydrate (~9,400 Daltons). At least seven isozymes of HRP exist. The isoelectric point for horseradish peroxidase isozymes ranges from 3.0 - 9.0.

Alkalmazás

Horseradish peroxidase (HRP) is isolated from horseradish roots (Amoracia rusticana) and belongs to the ferroprotoporphyrin group of peroxidases. It is used in biochemistry applications such as western blots, ELISA and Immunohistochemistry. Horseradish peroxidase is used to amplify a weak signal and increase detectability of a target molecule, such as a protein. Product P8415, type XII, is an essentially salt free lyophilized powder. It is a further purification of product P8375. It is commonly used to determine amounts of glucose and peroxides in solution. It has been used in an aspergillus fumigatus rapid susceptibility assay.

Peroxidase from horseradish has been used to initiate peroxidase-coupled assay. It has also been used in the preparation of β-galactosidase (β-gal) stock solution.

The enzyme has been used to determine H₂O₂ production in tobacco BY-2 cells using a spectrofluorimetric method.

Biokémiai/fiziológiai hatások

HRP readily combines with hydrogen peroxide (H₂O₂) and the resultant [HRP-H₂O₂] complex can oxidize a wide variety of hydrogen donors. The optimal pH is 6.0-6.5 and the enzyme is most stable in the pH range of 5.0-9.0. HRP can be conjugated to antibodies by several different methods including glutaraldehyde, periodate oxidation, through disulfide bonds, and also via amino and thiol directed cross-linkers. It is smaller and more stable than the enzyme labels β-galactosidase and alkaline phosphatase and hence, it is the most desired label. Also, its glycosylation leads to lower non-specific binding. It is also used for the determination of glucose and peroxides in solution.

When incubated with a substrate, horseradish peroxidase produces a coloured, fluorimetric, or luminescent derivative of the labeled molecule, allowing quantification. Horseradish peroxidase has been shown to slightly reduce the level of inhibition in a cydAB mutant. Known inhibitors are sodium azide, cyanide, L-cystine, dichromate, ethylenethiourea, hydroxylamine, sulfide, vanadate, p-aminobenzoic acid, and Cd²⁺, Co²⁺, Cu²⁺, Fe³⁺, Mn²⁺, Ni²⁺, and Pb²⁺ ions.

Egyéb megjegyzések

A further purification of Peroxidase TypeVI (P8375).

View more information on peroxidase at www.sigma-aldrich.com/enzymeexplorer.

Egység definíció

One pyrogallol unit will form 1.0 mg purpurogallin from pyrogallol in 20 sec at pH 6.0 at 20 °C.

Elkészítési megjegyzés

Chromatographically purified

Analízis megjegyzés

Preliminary isoelectric focusing data indicates this is primarily isoenzyme C

The RZ (Reinheitszahl) is the absorbance ratio A₄₀₃/A₂₇₅ determined at 0.5-1.0 mg/ml in deionized water. It is a measure of hemin content, not enzymatic activity. Even preparations with high RZ may have low enzymatic activity.

Biztonsági adatok

• Piktogramok: GHS08
• Figyelmeztetés: Danger
• Figyelmeztető mondatok: H334
• Óvintézkedésre vonatkozó mondatok: P261 - P284 - P501
• Veszélyességi osztályok: Resp. Sens. 1
• Tárolási osztály kódja: 11 - Combustible Solids
• WGK: WGK 1
• Egyéni védőeszköz: Eyeshields, Gloves, type N95 (US)