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Related Experiment Videos

Engineering the lac permease for purification and crystallization

G G Prive1, H R Kaback

  • 1Ontario Cancer Institute, University of Toronto, Canada.

Journal of Bioenergetics and Biomembranes
|February 1, 1996
PubMed
Summary

Researchers redesigned the lactose permease, a membrane protein, to improve crystallization. Fusing it with cytochrome b562 created a "red permease" that is easier to purify and monitor for crystallization.

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Area of Science:

  • Structural biology
  • Membrane protein research
  • Protein engineering

Background:

  • Membrane proteins are crucial but challenging to crystallize.
  • The lactose permease serves as a model for membrane protein studies.
  • Improving crystallization likelihood is key for structural determination.

Purpose of the Study:

  • To rationally redesign the lactose permease for enhanced crystallization.
  • To develop a fusion protein that retains lactose permease function and is easily detectable.
  • To create a model system for membrane protein structural studies.

Main Methods:

  • Engineering modifications including C-terminal histidine tags for purification.
  • Inserting the cytochrome b562 domain into a cytoplasmic loop of lactose permease.

Related Experiment Videos

  • Utilizing nickel-chelate chromatography for protein purification.

    • Main Results:

    • The modified lactose permease (fusion protein) retained transport activity.
    • The fusion protein exhibited the visible absorbance spectrum of cytochrome b562.
    • The resulting "red permease" facilitated monitoring through expression, purification, and crystallization stages.

    Conclusions:

    • Fusion of cytochrome b562 to lactose permease enhances its handling and crystallization potential.
    • The engineered "red permease" is a valuable tool for studying membrane protein structure and function.
    • Rational protein redesign strategies can overcome crystallization challenges for membrane proteins.