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Related Concept Videos

Bacterial Phylum Cyanobacteria01:30

Bacterial Phylum Cyanobacteria

59
Cyanobacteria are a diverse group of oxygenic, phototrophic bacteria that played a pivotal role in converting Earth’s atmosphere from anoxic to oxygen-rich billions of years ago. They exhibit remarkable morphological diversity, ranging from unicellular forms to filamentous types, with cell sizes varying between 0.5 μm and 100 μm. Cyanobacteria are classified into five groups: Chroococcales (unicellular, dividing by binary fission), Pleurocapsales (unicellular, dividing by...
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Assessing and reducing phenotypic instability in cyanobacteria.

Maxwell Calvin Guillaume1, Filipe Branco Dos Santos1

  • 1Molecular Microbial Physiology Group, Swammerdam Institute for Life Sciences, Faculty of Science, University of Amsterdam, Science Park 904, Amsterdam 1098 XH, the Netherlands.

Current Opinion in Biotechnology
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Summary

Cyanobacteria instability in large bioreactors can be predicted and managed using metabolic models. Designing strains with specific metabolic changes can ensure stable, high-level production of valuable compounds.

Keywords:
CyanobacteriaGenetic instabilityGrowth-coupled productionPhenotypic instabilityProduction modeScale-up

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Area of Science:

  • Synthetic biology
  • Metabolic engineering
  • Microbial biotechnology

Background:

  • Cyanobacteria show potential as sustainable cell factories for bioproduction.
  • Phenotypic instability, characterized by the emergence of nonproducing cells, is a significant challenge in scaling up cyanobacteria bioproduction.
  • This instability can lead to substantial production losses over longer evolutionary timescales in industrial bioreactors.

Purpose of the Study:

  • To address the challenge of phenotypic instability in cyanobacteria bioproduction.
  • To enable informed decisions in strain development for scalable bioproduction.
  • To explore strategies for mitigating instability and ensuring consistent metabolite production.

Main Methods:

  • Utilizing genome-scale metabolic models for in silico strain design.
  • Developing growth-coupled production strains to enhance stability.
  • Investigating strategies like inducing cofactor imbalances and removing recycling reactions.

Main Results:

  • In silico studies predicted that specific metabolic manipulations can enhance strain stability.
  • The proposed methods aim to mitigate the emergence and selection of nonproducing cells.
  • These strategies are expected to lead to the stable production of diverse metabolites.

Conclusions:

  • Genome-scale metabolic modeling is a powerful tool for designing stable cyanobacteria production strains.
  • Targeted metabolic engineering can overcome phenotypic instability in industrial bioproduction.
  • This approach facilitates the reliable and scalable use of cyanobacteria as sustainable cell factories.