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Modeling and simulation of fed-batch protein refolding process.

Xiao-Yan Dong1, Guang-Quan Shi, Wei Li

  • 1Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People's Republic of China.

Biotechnology Progress
|August 7, 2004
PubMed
Summary
This summary is machine-generated.

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A simplified kinetic model accurately describes lysozyme refolding under specific conditions. Fed-batch strategies, influenced by denaturant concentration and flow rate, optimize protein folding yield.

Area of Science:

  • Protein biochemistry
  • Biophysical chemistry
  • Chemical engineering

Background:

  • Protein misfolding and aggregation are significant challenges in biotechnology.
  • Optimizing refolding conditions is crucial for obtaining functional proteins.

Purpose of the Study:

  • To develop and validate a kinetic model for fed-batch refolding of denatured-reduced lysozyme.
  • To investigate the influence of denaturant concentration, protein concentration, and fed-batch parameters on refolding yield.

Main Methods:

  • A simplified kinetic model was employed, considering first-order folding and third-order aggregation.
  • Fed-batch refolding experiments were conducted with varying guanidinium chloride (GdmCl) concentrations and protein loads.
  • Computer simulations were used to analyze the impact of process parameters.

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Main Results:

  • The kinetic model successfully described refolding within specific protein concentration ranges (1-2 and 5-7 mg/mL) at high GdmCl levels.
  • Folding and aggregation rate constants were dependent on protein and GdmCl concentrations.
  • Rate constants determined from fed-batch experiments could predict the process but not direct batch refolding.
  • Denaturant concentration and fed-batch flow rate significantly impact refolding yield.

Conclusions:

  • Fed-batch refolding offers advantages over batch methods, particularly at low denaturant concentrations.
  • Prolonged fed-batch time is beneficial for increasing correctly folded protein yield by minimizing intermediates.
  • Optimized fed-batch strategies, including feed rate and duration, are essential for maximizing refolding efficiency.