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Expression, Solubilization, and Purification of Eukaryotic Borate Transporters
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Concentrating membrane proteins using ultrafiltration without concentrating detergents.

Hasin Feroz1, Craig Vandervelden1, Bon Ikwuagwu1

  • 1Department of Chemical Engineering, The Pennsylvania State University, 155 Fenske Laboratory, University Park, Pennsylvania, 16802.

Biotechnology and Bioengineering
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Summary

Ultrafiltration (UF) concentrates membrane proteins (MPs) but also retains detergents. Optimizing UF systems to promote concentration polarization (CP) is key for efficient MP purification without unwanted detergent micelles.

Keywords:
concentration polarizationmembrane proteinsultrafiltration

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Area of Science:

  • Biotechnology
  • Biochemical Engineering
  • Membrane Science

Background:

  • Membrane proteins (MPs) are crucial for pharmaceuticals, sensors, and synthetic membranes.
  • Ultrafiltration (UF) is common for concentrating low-yield MPs but also concentrates detergent micelles.
  • Understanding detergent passage during UF is vital for optimizing MP purification.

Purpose of the Study:

  • To analyze hydrodynamic processes governing detergent passage during MP ultrafiltration.
  • To propose methods for optimizing detergent removal during large-scale MP concentration.
  • To investigate the impact of system design on detergent sieving during UF.

Main Methods:

  • Studied nonionic detergents (OG, DM) with Aquaporin Z and halorhodopsin using ultrafiltration.
  • Evaluated detergent passage via sieving coefficient (So) in stirred cell and centrifugal systems.
  • Analyzed the effects of filtrate flux, shear rate, and concentration polarization (CP) on So.

Main Results:

  • Detergent passage (So) increased with filtrate flux and decreased shear rates (higher CP) in stirred cells.
  • MP-detergent micelles showed similar trends to free detergents.
  • Centrifugal UF exhibited lower detergent and MP-detergent micelle transmission due to reduced CP.

Conclusions:

  • Concentration polarization (CP) significantly influences detergent passage during MP ultrafiltration.
  • Designing UF systems that promote CP is essential for concentrating MPs while minimizing detergent retention.
  • Optimized UF strategies can improve the purification of membrane proteins for various applications.