An efficient in vitro refolding of recombinant bacterial laccase in Escherichia coli |
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Authors: | Nasrin Mollania Khosro Khajeh Bijan Ranjbar Fatemeh Rashno Neda Akbari Mehrnoosh Fathi-Roudsari |
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Institution: | 1. Department of Biology, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar, Iran;2. Department of Biochemistry and Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran;3. Department of Microbiology, Faculty of Sciences, Islamic Azad University, Arak Branch, Arak, Iran |
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Abstract: | Laccases (benzenediol oxygen oxidoreductases, EC 1.10.3.2) are important multicopper enzymes that are used in many biotechnological processes. A recombinant form of laccase from Bacillus sp. HR03 was overexpressed in Escherichia coli BL-21(DE3). Inclusion body (IB) formation happens quite often during recombinant protein production. Hence, developing a protocol for efficient refolding of proteins from inclusion bodies to provide large amounts of active protein could be advantageous for structural and functional studies. Here, we have tried to find an efficient method of refolding for this bacterial enzyme. Solubilization of inclusion bodies was carried out in phosphate buffer pH 7, containing 8 M urea and 4 mM β-mercaptoethanol and refolding was performed using the dilution method. The effect of different additives was investigated on the refolding procedure of denaturated laccase. Mix buffer (phosphate buffer and citrate buffer, 100 mM) containing 4 mM ZnSO4 and 100 mM sorbitol was selected as an optimized refolding buffer. Also Kinetic parameters of soluble and refolded laccase were analyzed. |
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Keywords: | Laccase Refolding Inclusion body Intrinsic fluorescence Overexpression |
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