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Related Experiment Videos

An improved system for ribonuclease Ba expression

A L Okorokov1, R W Hartley, K I Panov

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow.

Protein Expression and Purification
|December 1, 1994
PubMed
Summary
This summary is machine-generated.

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Researchers developed an efficient system for producing barnase, an extracellular ribonuclease, in E. coli. This method yields high-purity barnase protein for structure-function studies.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Barnase (extracellular ribonuclease from Bacillus amyloliquefaciens) is crucial for enzyme structure-function research.
  • Existing methods for barnase production can be inefficient.
  • A robust expression and purification system is needed for large-scale barnase production.

Purpose of the Study:

  • To develop an efficient and scalable system for expressing and purifying barnase (RNase Ba) in Escherichia coli.
  • To optimize the production of homogeneous barnase protein for biochemical studies.

Main Methods:

  • Utilized a strong, regulated expression cassette with the lambda phage Pr promoter in E. coli.
  • Co-expressed barnase and its inhibitor barstar under Pr promoter control.

Related Experiment Videos

  • Engineered plasmid pTN441 for large-scale barnase production, incorporating the phoA signal peptide for periplasmic targeting.
  • Purified barnase using a two-step process: sample concentration followed by reverse-phase high-performance liquid chromatography (RP-HPLC).

    • Main Results:

    • Achieved a stable yield of homogeneous barnase protein.
    • The system produced approximately 100-150 mg of pure barnase per liter of culture medium.
    • Demonstrated the efficacy of the Pr promoter and cooperative expression strategy for high-level protein production.

    Conclusions:

    • The developed expression and purification system is highly efficient for large-scale barnase production.
    • This system provides a reliable source of homogeneous barnase for structure-function studies.
    • The strategy offers a valuable tool for researchers requiring significant quantities of purified barnase.