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Cholesterol Esterase from Pseudomonas sp.

lyophilized powder, ≥200,000 units/g protein

Cholesterol Esterase from Pseudomonas fluorescens, Sterol-ester acylhydrolase
CAS Number:
Enzyme Commission number:
EC Number:
MDL number:


lyophilized powder

Quality Level

specific activity

≥200,000 units/g protein

mol wt

~300 kDa


protein, ≥40% biuret

storage temp.


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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.

Storage Class Code

13 - Non Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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Technical Information

More Documents

Quotes and Ordering

Pornpen Srisawasdi et al.
Journal of clinical laboratory analysis, 26(6), 420-430 (2012-11-13)
Accurate determination of cholesterol requires complete hydrolysis of cholesteryl esters and must be very fast for the kinetic cholesterol assay. We investigated the properties of cholesterol esterase derived from Pseudomonas fluorescens, Candida cylindracea, bovine pancreas, and porcine pancreas for cholesterol
Kevin R Shreder et al.
Bioorganic & medicinal chemistry letters, 22(17), 5748-5751 (2012-08-11)
KIAA1363 is a serine hydrolase whose activity has been shown to be positively associated with tumor cell invasiveness. Thus, inhibitors of KIAA1363 represent a novel targeted therapy approach towards cancer. AX11890 ((1-bromo-2-naphthyl) N,N-dimethylcarbamate) was identified as a KIAA1363 inhibitor with
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
Marta Fernández-Galilea et al.
Journal of lipid research, 53(11), 2296-2306 (2012-09-04)
Lipoic acid (LA) is a naturally occurring compound with beneficial effects on obesity. The aim of this study was to evaluate its effects on lipolysis in 3T3-L1 adipocytes and the mechanisms involved. Our results revealed that LA induced a dose-
Mi-Jeong Lee et al.
American journal of physiology. Endocrinology and metabolism, 303(9), E1126-E1133 (2012-09-06)
High concentrations of TNF within obese adipose tissue increase basal lipolysis and antagonize insulin signaling. Adipocytes of the obese are also exposed to elevated levels of glucocorticoids (GCs), which antagonize TNF actions in many cell types. We tested the hypothesis


Cholesterol Esterification

Cholesterol undergoes esterification to improve transport. Cholesterol esters are more easily packaged into the interior of lipoproteins - increasing the quantity that can be readily transported in the blood stream.


Assay Procedure for Cholesterol Esterase

Protocol for Assay Procedure for Cholesterol Esterase

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