C3766

Cholesterol Esterase from bovine pancreas

lyophilized powder, ≥200 units/g protein

• Synonyme(s) : Sterol-ester acylhydrolase
• Numéro CAS: 9026-00-0
• Numéro de classification (Commission des enzymes): 3.1.1.13 (BRENDA, IUBMB)
• Numéro CE : 232-808-6
• Numéro MDL: MFCD00071052
• Code UNSPSC : 12352204
• Nomenclature NACRES : NA.54

Propriétés

• Forme: lyophilized powder
• Activité spécifique: ≥200 units/g protein
• Poids mol.: 84 kDa by SDS-PAGE
• Composition: protein, ≥20%
• Température de stockage: −20°C

Description

Description générale

Cholesterol Esterase from bovine pancreas is a member of α-β hydrolase superfamily. The core of the protein comprises 11 β-strands, surrounded by 15 α-strands. Catalytic triad is in the centre of the molecule. The C-terminus possesses hydrophobic residues.

Application

Cholesterol Esterase from bovine pancreas has been used:

• in γ-oryzanol-hydrolyzing activity
• in cholesterol esterase enzyme activity for quantification of cholesterol and cholesterol esters associated in tear film and lenses samples
• to test in vitro degradation of poly(fumaroyl bioxirane) maleate (PFM) polymer designed for bone tissue engineering

Cholesterol esterase bound to membrane-associated heparin on brush border membranes aids in the transport of cholesterol and free fatty acid across the membrane. This enzyme is widely used in the determination of serum cholesterol in clinical laboratories. The enzyme from Sigma has been used to evaluate the inhibitory and antioxidant functions of the methanol extract of the Camellia sinensis leaves under in vitro conditions. The enzyme has also been used to digest human serum samples to confirm the presence and position of acyl esters of 7α-hydroxycholesterol.

Enzyme responsible for the hydrolysis of many of the fatty acid esters of cholesterol.
Optimum pH range: 6-8
Activators: Bisphenol A diglycidyl ether, cAMP-dependent protein kinase type II, ethanol, methanol, n-butanol, phosphatidylcholine, phosphatidylethanolamine, sodium taurocholic acid
Inhibitors: Bisphenol A methacrylate, diisopropylfluorophosphate, enolase, Hg²⁺, sodium fluoride, phosphatidic acid, phosphatidylcholine, phosphatidylserine

Actions biochimiques/physiologiques

Cholesterol esterase (CE) is a reversible enzyme that can hydrolyze or synthesize fatty acid esters of cholesterol and other sterols. Hydrolysis of water insoluble long chain fatty acid esters requires bile salt activation. Hydrolysis of water soluble esters of short chain fatty acids and lysophospholipids does not require activation by bile salts. It also hydrolyzes tri-, di-, and mono-acylglycerols, phospholipids, lysophospholipids, and ceramide. This monomeric glycoprotein may have multiple functions in lipid and lipoprotein metabolism, as well as in atherosclerosis. Its molecular mass is found to be 84 kDa.

Autres remarques

Partially purified

Définition de l'unité

One unit will hydrolyze 1.0 μmole of cholesteryl oleate to cholesterol and oleic acid per minute at pH 7.0 at 37 °C in the presence of taurocholate.

Forme physique

This product is partially purified from bovine pancreas and is supplied as a white to light brown lyophilized powder containing ≥20% protein (biuret) and potassium phosphate.

Notes préparatoires

Cholesterol esterase is soluble in 0.4 M potassium phosphate, pH 7.0 at 1 mg/mL concentration.

Remarque sur l'analyse

Protein determined by biuret.

Informations sur la sécurité

• Pictogrammes: GHS08
• Mention d'avertissement: Danger
• Mentions de danger: H334
• Conseils de prudence: P261 - P284 - P501
• Classification des risques: Resp. Sens. 1
• Code de la classe de stockage: 11 - Combustible Solids
• Classe de danger pour l'eau (WGK): WGK 1
• Point d'éclair (°F): Not applicable
• Point d'éclair (°C): Not applicable
• Équipement de protection individuelle: Eyeshields, Gloves, type N95 (US)