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C9281 Sigma

Cholesterol Esterase from Pseudomonas fluorescens

lyophilized powder, ≥10,000 units/g protein

Synonym: Sterol-ester acylhydrolase

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Properties

Related Categories 3.1.x.x Acting on esters, 3.x.x.x Hydrolases, Application Index, Biochemicals and Reagents, Cell Biology,
form   lyophilized powder
composition   Protein, ~20%
solubility   0.4 M potassium phosphate, pH 7.0: soluble1.0 mg/mL
storage temp.   −20°C

Description

Analysis Note

Protein determined by biuret.

Other Notes

Contains potassium phosphate and TRITON® X-100.

Packaging

100, 500 units in poly bottle

Unit Definition

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

Application

Cholesterol esterase from Pseudomonas fluorescens has been used in an optimization study of components in enzymatic cholesterol reagents containing cholesterol oxidase. Cholesterol esterase from Pseudomonas fluorescens has also been used in a study to investigate the nondenaturing protein electrotransfer of the esterase activity of lipolytic preparations.

This enzyme is widely used in the determination of serum cholesterol in diagnostic laboratories.

Biochem/physiol Actions

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 ceramides. The enzyme may have multiple functions in lipid and lipoprotein metabolism, as well as in atherosclerosis. Its molecular mass is approximately 129 kDa and the optimum pH range is 7.0-9.0. The enzyme is activated by cholic acid, glycocholic acid, BSA, Mg2+ and 0.3% (v/v) X-100. Ag+, Hg2+ and ionic detergents inhibit the activity of the enzyme.

Legal Information

Triton is a trademark of The Dow Chemical Company or an affiliated company of Dow

Price and Availability


All labs need water

Biomedical Applications
Safety & Documentation

Safety Information

RIDADR 
NONH for all modes of transport
WGK Germany 
3
Protocols & Articles

Articles

Cholesterol Esterification

To more efficiently transport both dietary and synthesized cholesterol, it is converted to cholesteryl esters. Free cholesterol can be taken up by lipoproteins, but is confined to the outer surface o...
BioFiles 2007, 2.7, 10.
Keywords: Biofiles, Catalysis

Related Content

Enzymes & Proteins

Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Molecular biology

Peer-Reviewed Papers
15

References

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92210 Timestrip Plus 0 °C
06693 Timestrip Plus -20 °C

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