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Related Experiment Videos

Directed evolution of RuBisCO hypermorphs through genetic selection in engineered E.coli.

Monal R Parikh1, Dina N Greene, Kristen K Woods

  • 1Department of Biochemistry, Center for Fundamental and Applied Molecular Evolution, Emory University School of Medicine, Rollins Research Center, Room 4119, Atlanta, GA 30322, USA.

Protein Engineering, Design & Selection : PEDS
|January 21, 2006
PubMed
Summary

Scientists engineered improved ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) variants by reconstructing the Calvin Cycle in E. coli. This directed evolution strategy yielded RuBisCO with 5-fold higher activity, advancing enzyme engineering.

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Area of Science:

  • Biochemistry
  • Metabolic Engineering
  • Synthetic Biology

Background:

  • The Calvin Cycle is crucial for carbon dioxide fixation in the biosphere.
  • Ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) is the key enzyme catalyzing the rate-limiting step of carbon fixation.
  • Improving RuBisCO's kinetic and biophysical properties is essential for enhancing photosynthetic efficiency.

Purpose of the Study:

  • To develop a directed evolution strategy for improving RuBisCO.
  • To create novel RuBisCO variants with enhanced catalytic activity and stability.
  • To demonstrate the feasibility of using a reconstructed Calvin Cycle in E. coli for enzyme evolution.

Main Methods:

  • Partially reconstructing the Calvin Cycle in Escherichia coli.

Related Experiment Videos

  • Randomly mutating the RuBisCO large subunit gene (rbcL) and co-expressing it with the small subunit (rbcS) and phosphoribulokinase (prkA).
  • Employing a selection strategy to identify hypermorphic RuBisCO variants after three rounds of mutagenesis.

    • Main Results:

    • Engineered E. coli strains demonstrated RuBisCO-dependent growth on minimal media with pentose.
    • Evolved RuBisCO variants exhibited a 5-fold improvement in specific activity compared to wild-type.
    • The study successfully identified and characterized significantly improved RuBisCO enzymes.

    Conclusions:

    • A novel strategy for artificial selection of RuBisCO has been established.
    • This method is applicable for evolving other non-native metabolic enzymes.
    • Directed evolution in a reconstructed metabolic pathway offers a powerful tool for enzyme engineering.