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Ethanol synthesis by genetic engineering in cyanobacteria
1Department of Botany, University of Toronto, Toronto, Ontario, M5S 3B2, Canada.
Applied and Environmental Microbiology
|January 30, 1999
Summary
Researchers engineered cyanobacteria to produce ethanol by introducing genes for ethanol synthesis. This novel bioconversion system efficiently converts solar energy and CO2 into valuable ethanol fuel.
Area of Science:
- Biotechnology
- Metabolic Engineering
- Photosynthesis
Background:
- Cyanobacteria are prokaryotes performing oxygenic photosynthesis.
- They store carbon primarily as glycogen.
- Efficient carbon fixation and simple growth requirements make them suitable for bioproduction.
Purpose of the Study:
- To engineer a novel carbon utilization pathway in cyanobacteria.
- To enable the synthesis and accumulation of ethanol.
- To explore cyanobacteria as a platform for solar energy and CO2 bioconversion.
Main Methods:
- Cloned pyruvate decarboxylase (pdc) and alcohol dehydrogenase II (adh) genes from Zymomonas mobilis.
- Transformed Synechococcus sp. strain PCC 7942 using the shuttle vector pCB4.
- Expressed genes under the control of the rbcLS operon promoter.
Main Results:
- High-level expression of pdc and adh genes confirmed by Western blotting and enzyme assays.
- Transformed cyanobacteria successfully synthesized ethanol.
- Ethanol diffused from cells into the culture medium.
Conclusions:
- Engineered cyanobacteria can efficiently produce ethanol.
- This represents a novel pathway for fixed carbon utilization.
- Cyanobacteria offer a promising platform for sustainable bioproduction of biofuels from light and CO2.