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Haloarchaea as Cell Factories to Produce Bioplastics
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This study assessed microplastic ingestion by wild rabbits and hares in an agricultural landscape, finding particles in gastrointestinal contents of a majority of sampled individuals. Soil ingestion during grazing and the consumption of plant material contaminated with agricultural plastic fragments were identified as likely exposure routes for these terrestrial herbivores.
Plastic pollution is a worldwide concern causing the death of animals (mainly aquatic fauna) and environmental deterioration. Plastic recycling is, in most cases, difficult or even impossible. For this reason, new research lines are emerging to identify highly biodegradable bioplastics or plastic formulations that are more environmentally friendly than current ones. In this context, microbes, capable of synthesizing bioplastics, were revealed to be good models to design strategies in which microorganisms can be used as cell factories. Recently, special interest has been paid to haloarchaea due to the capability of some species to produce significant concentrations of polyhydroxyalkanoate (PHA), polyhydroxybutyrate (PHB), and polyhydroxyvalerate (PHV) when growing under a specific nutritional status. The growth of those microorganisms at the pilot or industrial scale offers several advantages compared to that of other microbes that are bioplastic producers. This review summarizes the state of the art of bioplastic production and the most recent findings regarding the production of bioplastics by halophilic microorganisms with special emphasis on haloarchaea. Some protocols to produce/analyze bioplastics are highlighted here to shed light on the potential use of haloarchaea at the industrial scale to produce valuable products, thus minimizing environmental pollution by plastics made from petroleum.
More Papers Like This
Current developments on polyhydroxyalkanoates synthesis by using halophiles as a promising cell factory
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Researchers reviewed how salt-loving microorganisms called halophiles can serve as efficient biological factories for producing polyhydroxyalkanoates (PHAs), a class of biodegradable plastics that could replace petroleum-based plastics. Their high salt requirements naturally prevent contamination during large-scale fermentation, and advances in metabolic engineering are making PHA production cheaper and more scalable.
The Halophilic Bacterium Paracoccus haeundaensis for the Production of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate) from Single Carbon Sources
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This study demonstrated for the first time that Paracoccus haeundaensis can produce polyhydroxyalkanoates (PHAs) under nitrogen-limited conditions with glucose as carbon source, identifying it as a potential new bacterial host for biodegradable plastic production.
Production and characterization of polyhydroxyalkanoates by Halomonas alkaliantarctica utilizing dairy waste as feedstock
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Researchers found that a salt-tolerant Antarctic bacterium called Halomonas alkaliantarctica can convert cheese whey — a dairy industry waste product — into polyhydroxyalkanoate (PHA), a biodegradable plastic alternative, producing up to 0.42 g/L without any additional nutrients, offering a dual benefit of waste valorization and sustainable bioplastic production.
Bioplastics against Microplastics: Screening of Environmental Bacteria for Bioplastics Production
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Researchers screened environmental bacteria for their ability to produce polyhydroxyalkanoate bioplastics, which are biodegradable alternatives to conventional petroleum-based plastics. Developing efficient bioplastic-producing strains is one strategy to reduce the long-term accumulation of persistent microplastics in the environment.
Sustainable Poly(3-hydroxybutyrate) Bioplastic Production by Extremely Halophilic Haloarcula sp. PLQ Isolated from Qatari Extreme Environments
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Scientists discovered salt-loving microbes in Qatar's extreme environments that can produce a biodegradable plastic (called PHB) as they grow, offering a promising alternative to traditional plastics made from petroleum. This matters because conventional plastics break down into microplastics that pollute our environment and have been found in human blood, organs, and even breast milk—so finding sustainable, biodegradable alternatives could help reduce our long-term exposure to these particles. While this is still early-stage lab research, it points toward greener plastic production methods that don't rely on fossil fuels.
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