Optimizing purification and refolding conditions of the recombinant ephrin-A5 from inclusion bodies of Escherichia coli
Keywords:
ephrin-A5, refolding conditions screening, imobilized metal affinity chromatography, recombinant proteins, inclusion bodiesAbstract
The paper is devoted to isolation, purification and development of refolding approach of the recombinant ephrin-A5 out of Escherichia coli inclusion bodies which corresponds to the aim of the research. The main methods applied are UV/visible spectroscopy, protein electrophoresis, column chromatography, refolding by dilution and matrix-assisted renaturation. Composition of the washing and solubilizing solutions was established as a result of washing and solubilizing conditions optimization allowing to get rid of impurities and minimize loss of the target protein as well as carry out the protein extraction out of inclusion bodies. The protein of interest with 70.3 ± 7.4 % purity was managed to obtain in conducting concentration and purification of the solubilized recombinant ephrin-A5 with the help of immobilized metal affinity chromatography on Ni-sepharose. Following refolding system containing 20 mmol/l Tris-HCl; pH 8; 50 mmol/l sucrose; 2.5 mmol/l DTT; 50 mmol/l NaCl with the final protein concentration up to 200 mkg/ml and 10-fold dilution was chosen as the best during the main refolding buffer characteristics screening.
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