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C1403

Sigma-Aldrich

Cholesterol Esterase from Pseudomonas sp.

lyophilized powder, ≥200,000 units/g protein

Synonym(s):

Cholesterol Esterase from Pseudomonas fluorescens, Sterol-ester acylhydrolase

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About This Item

CAS Number:
9026-00-0
Enzyme Commission number:
3.1.1.13 (BRENDA, IUBMB)
EC Number:
232-808-6
MDL number:
MFCD00071052
UNSPSC Code:
12352204
NACRES:
NA.54

form

lyophilized powder

Quality Level

200

specific activity

≥200,000 units/g protein

mol wt

~300 kDa

composition

protein, ≥40% biuret

storage temp.

−20°C

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Application

This enzyme is useful for enzymatic determination of total cholesterol when coupled with cholesterol oxidase in clinical analysis.

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 ceramide. The enzyme may have multiple functions in lipid and lipoprotein metabolism, and atherosclerosis.

Physical properties

Stability: Stable at –20°C for at least one year
Isoelectric point: 5.9 ± 0.1
Michaelis constants: 5.4 x 10‾5M (Linoleate), 6.6 x 10‾5M (Oleate)
3.7 x 10‾5M (Linolenate), 1.5 x 10‾4M (Palmitate)
1.2 x 10‾4M (Myristate), 2.3 x 10‾5M (Stearate)
Inhibitors: Hg++, Ag+, ionic detergents
Optimum pH: 7.0 − 9.0
Optimum temp: 40°C
pH Stability: pH 5.0 − 9.0 (25°C, 24hr)
Thermal stability: Below 55°C (pH 7.5, 10min)

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.

Pictograms

Health hazard
GHS08

Signal Word

Danger

Hazard Statements

H334

Precautionary Statements

P261 - P284 - P501

Hazard Classifications

Resp. Sens. 1

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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David Y Hui et al.
Journal of lipid research, 43(12), 2017-2030 (2002-11-28)
Carboxyl ester lipase (CEL), previously named cholesterol esterase or bile salt-stimulated (or dependent) lipase, is a lipolytic enzyme capable of hydrolyzing cholesteryl esters, tri-, di-, and mono-acylglycerols, phospholipids, lysophospholipids, and ceramide. The active site catalytic triad of serine-histidine-aspartate is centrally
Yong-lan Huang et al.
Zhonghua er ke za zhi = Chinese journal of pediatrics, 50(8), 601-605 (2012-11-20)
To explore the clinical characteristics of Wolman disease and diagnostic methods using enzymatic and molecular analysis. Lysosomal acid lipase activity was measured using 4-methylumbelliferyl oleate in the leukocytes of an infant suspected of Wolman disease and LIPA gene mutational analysis
Joanna Karbowska et al.
Steroids, 77(13), 1359-1365 (2012-09-07)
Dehydroepiandrosterone (DHEA) reduces body fat in rodents and humans, and increases glycerol release from isolated rat epididymal adipocytes and human visceral adipose tissue explants. It suggests that DHEA stimulates triglyceride hydrolysis in adipose tissue; however, the mechanisms underlying this action
Vincent Delorme et al.
PloS one, 7(9), e46493-e46493 (2012-10-03)
Lipid metabolism plays an important role during the lifetime of Mycobacterium tuberculosis, the causative agent of tuberculosis. Although M. tuberculosis possesses numerous lipolytic enzymes, very few have been characterized yet at a biochemical/pharmacological level. This study was devoted to the
Maria Morak et al.
Molecular & cellular proteomics : MCP, 11(12), 1777-1789 (2012-09-18)
Adipose triglyceride lipase (ATGL) and hormone-sensitive lipase (HSL) are key enzymes involved in intracellular degradation of triacylglycerols. It was the aim of this study to elucidate how the deficiency in one of these proteins affects the residual lipolytic proteome in
View All Related Papers

Articles

Cholesterol Esterification

Cholesterol esterification enhances transport efficiency in lipoproteins for increased blood stream transport.

Cholesterol Esterification

Cholesterol esterification enhances transport efficiency in lipoproteins for increased blood stream transport.

Cholesterol Esterification

Cholesterol esterification enhances transport efficiency in lipoproteins for increased blood stream transport.

Cholesterol Esterification

Cholesterol esterification enhances transport efficiency in lipoproteins for increased blood stream transport.

Protocols

Assay Procedure for Cholesterol Esterase

Protocol for Assay Procedure for Cholesterol Esterase

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