Purification and characterization of novel extracellular cholesterol esterase from Acinetobacter sp

CHE4‐1, a bacterial strain that belongs to the genus Acinetobacter and expresses high level of inducible extracellular cholesterol esterase (CHE), was isolated from feces of carnivore Panthera pardus var. The cholesterol esterase of the strain CHE4‐1 was purified by ultrafiltration followed with DEA...

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Bibliographic Details
Published in:Journal of basic microbiology 2010-12, Vol.50 (S1), p.S30-S36
Main Authors: Du, Liangjun, Huo, Ying, Ge, Fanglan, YU, Jiajun, Li, Wei, Cheng, Guiying, Yong, Bin, Zeng, Lihuang, Huang, Min
Format: Article
Language:English
Subjects:
Acinetobacter
Acinetobacter - enzymology
Acinetobacter - genetics
Acinetobacter - isolation & purification
Animals
Carnivore feces
Characterization
Cholesterol esterase
Enzyme Stability
Feces - microbiology
Molecular Weight
Panthera - microbiology
Panthera pardus
RNA, Ribosomal, 16S - genetics
Sterol Esterase - isolation & purification
Sterol Esterase - metabolism
Substrate Specificity
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Summary:CHE4‐1, a bacterial strain that belongs to the genus Acinetobacter and expresses high level of inducible extracellular cholesterol esterase (CHE), was isolated from feces of carnivore Panthera pardus var. The cholesterol esterase of the strain CHE4‐1 was purified by ultrafiltration followed with DEAE‐Sepharose FF chromatography and Phenyl‐Sepharose CL‐4B chromatography, and then by Sephadex G‐50 gel filtration. Different from other known microbial cholesterol esterase, the purified CHE from CHE4‐1 strain is a monomer with molecular weight of 6.5 kD and has high activity to both long‐chain and short‐chain cholesterol ester. Enzymatic activity was enhanced in the presence of metal ion Ca²⁺, Zn²⁺ and boracic acid, and was not significantly affected by several detergents including sodium cholate, Triton X100 and Tween‐80. The enzyme was found to be stable during long‐term aqueous storage at 4 °C, indicating its potential as a clinical diagnostic reagent. To the best of our knowledge, this is the first report regarding purification and characterization of CHE from Acinetobacter sp. The results demonstrated that this particular CHE is a novel cholesterol esterase. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0233-111X
1521-4028
DOI:10.1002/jobm.200900292