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Genetic Modification of Cyanobacteria by Conjugation Using the CyanoGate Modular Cloning Toolkit
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Recombinant Protein Stability in Cyanobacteria.

Xianan Zhang1, Nico Betterle1, Diego Hidalgo Martinez1

  • 1Department of Plant and Microbial Biology, University of California, Berkeley, California 94720-3102, United States.

ACS Synthetic Biology
|March 8, 2021
PubMed
Summary
This summary is machine-generated.

Recombinant proteins from plants and animals are unstable in cyanobacteria unless fused with other proteins. Fusion constructs enable high-level soluble protein expression in cyanobacteria for biotechnology applications.

Keywords:
Synechocystis sp. PCC 6803fusion constructsprotein overexpressionrecombinant proteintobacco etch virus protease

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Area of Science:

  • Biotechnology
  • Synthetic Biology
  • Protein Expression

Background:

  • Cells have mechanisms to remove foreign or damaged proteins, hindering recombinant protein overexpression.
  • Recombinant proteins in E. coli often form insoluble inclusion bodies.
  • Fusion constructs allow soluble recombinant protein accumulation in cyanobacteria, reaching 10-20% of total cellular protein.

Purpose of the Study:

  • Investigate recombinant protein stability in cyanobacteria (Synechocystis sp. PCC 6803).
  • Develop an in vivo cleavage system to separate target proteins from fusion leaders.
  • Provide insights into transgene overexpression, stability, and commercial exploitation in cyanobacteria.

Main Methods:

  • Utilized fusion constructs for high-level recombinant protein expression in cyanobacteria.
  • Employed an in vivo tobacco etch virus (TEV) cleavage system for protein processing.
  • Analyzed the stability of various plant, animal, and prokaryotic recombinant proteins in fusion and free forms.

Main Results:

  • Eukaryotic recombinant proteins are unstable in the cyanobacterial cytosol but stable in fusion configurations.
  • High expression levels (10-20% of total protein) of soluble recombinant proteins were achieved.
  • Demonstrated successful expression of diverse proteins including plant enzymes, human interferon, and bacterial toxins/resistance genes.

Conclusions:

  • Fusion strategies enhance the stability and expression of heterologous proteins in cyanobacteria.
  • Cyanobacteria can serve as effective biofactories for producing commercially relevant recombinant proteins.
  • This work lays the foundation for overexpressing pathway enzymes in synthetic biology using cyanobacteria.