Biotechnology and Bioprocess Engineering:BBE

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Initial Protein Concentration and Residual Denaturant Concentration Strongly Affect the Batch Refolding of Hen Egg White Lysozyme

  • Guise, Andrew D. (Department of Chemical Engineering University of Bath, Bath BA2 7AY, UK) ;
  • Chaudhuri, Julian B. (Department of Chemical Engineering University of Bath, Bath BA2 7AY, UK)
  • Published : 2001.12.01
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Abstract

The effects of several variables on the refolding of hen egg white lysozyme have been studied, Lysozyme was denatured in both urea, and guanidine hydrochloride(GuHCl), and batch refolded by dilution (100 to 1000 fold) into 0.1 M Tris-HCI, pH 8.2 mM EDTA 3 mM reduced glutathione and 0.3 mM oxidised glutathions. Refolding was found to be sensitive to temperature, with the highest refolding yield obtained at 50$\^{C}$. The apparent activation energy for lysozyme re-folding wasf ound to be 56kJ/mol, Refolding by dilution results in low concentrations of both de-naturant and reducing agent species. It was found that the residual concentrations obtained dur-ing dilution(100-fold dilution:[GuHCI]=0.06 mM, [DTT]=0.15 mM) were significant and could inhibit lysozyme refolding. This study has also shown that the initial protein concentration (1-10mg/mL) that is refolded is an important parameter. In the presence of residual GuHCl and DTT higher refolding yields were obtained when starting from higher initial lysozyme concentra-tions. This trend was reversed when residual denaturant components were removed from the re-folding buffer.

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