Cited by 29Microbial Metabolic Engineering and BioproductionAlgal biology and biofuel productionPhotosynthetic Processes and Mechanisms

Adaptive laboratory evolution of the fast-growing cyanobacterium Synechococcus elongatus PCC 11801 for improved solvent tolerance

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Srivastava, Vaibhav, Amanna, Ruth, Rowden, Stephen J.L., Sengupta, Shinjinee, Madhu, Swati, Howe, Christopher J., Wangikar, Pramod P.·2021·Journal of Bioscience and Bioengineering

Abstract

Cyanobacteria hold promise as cell factories for the photoautotrophic conversion of carbon dioxide to useful chemicals. For the eventual commercial viability of such processes, cyanobacteria need to be engineered for (i) efficient channeling of carbon flux toward the product of interest and (ii) improved product tolerance, the latter being the focus of this study. We chose the recently reported, fast-growing, high light and CO 2 tolerant cyanobacterium Synechococcus elongatus PCC 11801 for adaptive laboratory evolution. In two parallel experiments that lasted over 8400 h of culturing and 100 serial passages, S. elongatus PCC 11801 was evolved to tolerate 5 g/L n-butanol or 30 g/L 2,3-butanediol representing a 100% improvement in concentrations tolerated. The evolved strains retained alcohol tolerance even after being passaged several times without the alcohol stress suggesting that the changes were permanent. Whole genome sequencing of the n-butanol evolved strains revealed mutations in a number of stress responsive genes encoding translation initiation factors, RpoB and an ABC transporter. In 2,3-butanediol evolved strains, genes for ClpC, a different ABC transporter, glyceraldehyde-3-phosphate dehydrogenase and phosphoribulokinase were found to be mutated. Furthermore, the evolved strains showed significant improvement in tolerance toward several other alcohols. Notably, the n-butanol evolved strain could tolerate up to 32 g/L ethanol, thereby making it a promising host for photosynthetic production of biofuels via metabolic engineering.

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Crossref · 10.1016/j.jbiosc.2020.11.012

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  • Cyanobacterial ALE has already been used to improve solvent tolerance in Synechococcus elongatus PCC 11801 and cadmium tolerance in Synechocystis sp. PCC 6803, while engineered hypermutation has accelerated adaptation of Synechococcus elongatus PCC 7942 to combined high-light and high-temperature stress.

    “Cyanobacterial ALE has already been used to improve solvent tolerance in Synechococcus elongatus PCC 11801 [218] and cadmium tolerance in Synechocystis sp. PCC 6803 [219], while engineered hypermutation has accelerated adaptation of Synechococcus elongatus PCC 7942 to combined high-light and high-temperature stress [220].”

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Authors
Srivastava, V., Amanna, R., Rowden, S. J. L., Sengupta, S., Madhu, S., Howe, C. J., & Wangikar, P. P.
Affiliations
  • Indian Institute of Technology Bombay (IN)
  • University of Cambridge (GB)
Corresponding author
Wangikar, Pramod P.
Venue
Journal of Bioscience and Bioengineering
Publisher
Elsevier BV
Published
2021-05
Volume
131
Issue
5
Pages
491-500
ISSN
  • 1347-4421 (ISSN-L)
  • 1389-1723
OpenAlex
W3120133637
Cited by
29
References
77
Citations by year
2026: 3 · 2025: 7 · 2024: 5 · 2023: 4 · 2022: 6 · 2021: 4
FWCI
1.49
Type
journal article
Language
en
Open access
Locations
  • Journal of Bioscience and Bioengineering (publishedVersion)
  • PubMed (publishedVersion)
  • Apollo (University of Cambridge) (submittedVersion, cc-by-nc-nd)
  • Apollo
Funders
Department of Biotechnology , Ministry of Science and Technology
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
Keywords
adaptive laboratory evolution, solvent tolerance, ethanol tolerance, stress response genes, translation initiation factors, rpoB, ABC transporters, ClpC, glyceraldehyde-3-phosphate dehydrogenase, phosphoribulokinase, biofuel production
MeSH terms
Alcohols, Carbon Dioxide, Photosynthesis, Solvents, Directed Molecular Evolution, Synechococcus, Biofuels

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