Abstract
Cholesterol oxidase production (COD) by a new isolate characterized as Streptomyces sp. was studied in different production media and fermentation conditions. Individual supplementation of 1 % maltose, lactose, sucrose, peptone, soybean meal and yeast extract enhanced COD production by 80–110 % in comparison to the basal production medium (2.4 U/ml). Supplementation of 0.05 % cholesterol (inducer) enhanced COD production by 150 %. COD was purified 14.3-fold and its molecular weight was found to be 62 kDa. Vmax (21.93 μM/min mg) and substrate affinity Km (101.3 μM) suggested high affinity of the COD for cholesterol. In presence of Ba2+ and Hg2+ the enzyme activity was inhibited while Cu2+ enhanced the activity nearly threefold. Relative activity of the enzyme was found maximum in triton X-100 whereas sodium dodecyl sulfate inactivated the enzyme. The enzyme activity was also inhibited by the thiol-reducing reagents like Dithiothreitol and β-mercaptoethanol. The COD showed moderate stability towards all organic solvents except acetone, benzene and chloroform. The activity increased in presence of isopropanol and ethanol. The enzyme was most active at pH 7 and 37 °C temperature. This organism is not reported to produce COD.
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Acknowledgments
This study was financially supported by Council of Scientific and Industrial Research, India. The authors would like to thank Mr. A.K. Joshi, Technical officer in F.T. Division CDRI Lucknow for his valuable help.
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Niwas, R., Singh, V., Singh, R. et al. Production, purification and characterization of cholesterol oxidase from a newly isolated Streptomyces sp.. World J Microbiol Biotechnol 29, 2077–2085 (2013). https://doi.org/10.1007/s11274-013-1371-8
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DOI: https://doi.org/10.1007/s11274-013-1371-8