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International Journal of Medical Research & Health Sciences
Year : 2018, Volume : 5, Issue : 10
First page : ( 142) Last page : ( 147)
Online ISSN : 2319-5886.

Cloning, expression, and enzymatic activity evaluation of cholesterol oxidase gene isolated from a native Rhodococcus sp.

Lashgarian Hamed Esmaeil1,*, Shahzamani Kiana2, Jahanbakhsh Sareh3

1Hepatitis Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran

2Dept. of Biology, Faculty of Basic Sciences, Lorestan University, Khorramabad, Iran

3Research Center for Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman, Iran

*Corresponding E-mail: hamedesmaiili@gmail.com

Online published on 3 October, 2018.


Cholesterol oxidase (CHO) is one of the valuable enzymes that play an important role in: measurement of serum cholesterol, food industry as a biocatalyst and agriculture as a biological larvicide. This enzyme was produced by several bacterial strains. Wild type enzyme produced by Rhodococcus sp. secret two forms of CHO enzyme: extra cellular and membrane bound type which its amount is low and unstable. The goal of the study was cloning, expression, and enzymatic activity evaluation of cholesterol oxidase gene isolated from a native Rhodococcus sp. CHO gene was isolated from native bacteria and cloned into pET23a. In the next step, the construct was expressed in E.coli BL21 and induced by different concentration of IPTG ranges from 0.1–0.9 mM. This gene contains 1642 bp and encodes a protein consists of 533 amino acids. It has about 96% homology with CHO gene isolated from Rhodococcus equi. The high expression was obtained in 0.5 mM concentration of IPTG after 4 hour induction. This recombinant enzyme had a molecular weight of 55 kDa, that secretion of intra cellular type is much more than extra cellular form. The optimum pH and temperature conditions for the recombinant enzyme were 7.5 and 45°C, respectively. CHO enzyme obtained from Rhodococcus sp. is a cheap enzyme with medical and industrial applications that can be produced easily and purified in large scale with simple methods.



Cloning, Expression, Enzymatic activity, Cholesterol oxidase gene, Rhodococcus sp.


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