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Related Experiment Videos

Cosolvent assisted protein refolding.

J L Cleland1, D I Wang

  • 1Chemical Engineering Department, Massachusetts Institute of Technology, Cambridge 02139.

Bio/Technology (Nature Publishing Company)
|December 1, 1990
PubMed
Summary
This summary is machine-generated.

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Polyethylene glycol (PEG) cosolvents significantly accelerate protein refolding and prevent aggregation. This study demonstrates PEG

Area of Science:

  • Biochemistry
  • Protein Chemistry
  • Chemical Engineering

Background:

  • Cosolvents enhance protein refolding and reduce aggregation in aqueous solutions.
  • Polyethylene glycol (PEG) is a widely used cosolvent in biochemical applications.

Purpose of the Study:

  • To investigate the effect of polyethylene glycol (PEG) on the refolding rate and aggregation of bovine carbonic anhydrase B (CAB).
  • To elucidate the mechanism by which PEG influences protein refolding intermediates.

Main Methods:

  • Utilized PEG with molecular weights ranging from 1000 to 8000 Daltons.
  • Assessed the refolding rate and aggregation of CAB at varying PEG concentrations (3 and 30 g/l).
  • Analyzed the interaction of PEG with refolding intermediates using kinetic studies.

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Main Results:

  • PEG significantly increased the refolding rate of CAB, with a threefold increase observed at 3 g/l of PEG (3350 MW).
  • PEG effectively prevented protein aggregation during refolding and at equilibrium.
  • PEG was found to stabilize the first intermediate in the CAB refolding pathway, promoting its conversion to the second intermediate and preventing self-association.

Conclusions:

  • Polyethylene glycol (PEG) is an effective cosolvent for enhancing protein refolding and preventing aggregation.
  • PEG's mechanism involves stabilizing key refolding intermediates, leading to improved recovery of active protein.
  • The findings have implications for protein purification and recombinant protein production.