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Related Concept Videos

Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...

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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
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Protein refolding at high concentration using size-exclusion chromatography.

B Batas1, J B Chaudhuri

  • 1School of Chemical Engineering, University of Bath, Bath BA2 7AY, United Kingdom.

Biotechnology and Bioengineering
|April 5, 1996
PubMed
Summary

A novel chromatography method enhances protein refolding yields and concentration in one step. This technique reduces aggregation and purifies active proteins, improving efficiency for applications like hen egg white lysozyme refolding.

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Area of Science:

  • Biochemistry
  • Protein Chemistry
  • Chromatography

Background:

  • Protein refolding is crucial for producing active proteins from inclusion bodies.
  • Traditional methods often involve multiple steps, leading to yield loss and aggregation.
  • Improving refolding efficiency and concentration remains a challenge in protein biotechnology.

Purpose of the Study:

  • To develop a single-step method for protein refolding, buffer exchange, and aggregate removal.
  • To enhance refolding yields and increase the concentration of active refolded proteins.
  • To investigate the impact of size-exclusion chromatography matrices on protein aggregation during refolding.

Main Methods:

  • Utilized size-exclusion chromatography (SEC) matrices (Sephacryl S-100 HR) for simultaneous buffer exchange, aggregate removal, and refolding.
  • Investigated the effect of reduced protein diffusion in SEC media on suppressing nonspecific interactions.
  • Tested the method with hen egg white lysozyme (HEWL) and bovine carbonic anhydrase (CAB) at high initial protein concentrations (up to 80 mg/mL).

Main Results:

  • Successfully refolded HEWL and CAB with significantly reduced aggregation, even at high concentrations.
  • Achieved average recovery yields of 63% for HEWL (104% specific activity) and 56% for CAB (81% specific activity).
  • Demonstrated that reduced diffusion in SEC media suppresses aggregation of partially folded proteins.

Conclusions:

  • The developed SEC-based method enables efficient, single-step protein refolding and purification.
  • This approach improves refolding yields and protein concentration while minimizing aggregation.
  • The technique offers a promising advancement for protein production and biotechnology applications.