Engineered bacteria turn tobacco waste into useful chemicals
Munteanu IT, Huşleag A, Susanu RI, Mleşniță AM, Mihăşan M
Crispr
The tobacco plants grown for cigarettes leave behind nicotine-laden stems and dust that usually become environmental waste, and this microbial trick shows a path to turning that leftover into something useful instead of a pollution problem.
Tobacco farming and processing generate a lot of nicotine-rich leftovers that are hard to dispose of safely. Researchers tweaked the genes of a soil bacterium so it eats nicotine and stops partway through breaking it down, leaving behind a useful chemical called 6-hydroxynicotine instead of destroying it completely. They tested this in lab flasks and larger tanks, showing it works on both pure nicotine and real tobacco extracts.
Key Findings
A gene-edited bacterial strain overexpressing nicotine dehydrogenase produced up to 1.78 g/L of 6-hydroxynicotine, with a production rate of 104.4 mg/L per hour.
Adding 0.8 mM zinc sulfate blocked a competing enzyme (6-hydroxynicotine oxidase) and extended the window for product accumulation without hurting nicotine breakdown.
The process scaled up successfully in a stirred bioreactor using both pure nicotine and real tobacco extracts, with oxygen levels in the tank serving as a useful signal for monitoring the reaction.
chevron_right Technical Summary
Scientists engineered a soil bacterium to turn nicotine from tobacco industry waste into a valuable chemical called 6-hydroxynicotine, offering a way to recycle a toxic byproduct instead of letting it pollute the environment.
Abstract Preview
Original paper
Biotechnological potential of Paenarthrobacter nicotinovorans ATCC 49919 for the microbial conversion of nicotine and tobacco extracts into 6-hydroxynicotine.
Nicotine-rich wastes from the tobacco industry represent an environmental liability but also a potential feedstock for value-added bioconversion. In this study, the biotechnological potential of Pa...
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