    1.4.1.18 | His-tagged wild-type and mutant LysDHs after recombinant expression in Escherichia coli inclusion bodies are suspended in 20 mM Tris-HCl, pH 7.5, containing 5 mM 2-mercaptoethanol and 4% Triton X-100, and disrupted by sonication, followed by solubilization in 50 mM Tris-HCl, pH 7.5, containing 5 mM 2-mercaptoethanol, 6 M guanidine HCl, 0.2 M NaCl, and 1 mM EDTA. Refolding in buffer containing 0.1 M Tris-HCl, pH 7.5, 5 mM 2-mercaptoethanol, 0.4 M arginine, 2 mM EDTA, and 0.1 mM phenylmethylsulfonyl fluoride and incubation for 36 h at 4°C. Refolded LysDH is heated at 80°C for 10 min and clarified by centrifugation |
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