Omar Khalid
Plastic pollution is a pressing issue, with over 75% of plastic waste remaining in landfills, soils, and oceans for decades. This has led to the contamination of all environments and living organisms, posing a serious ecological threat. However, there is hope in the form of microbes that have evolved to biodegrade plastic. These plastic-eating microbes have the potential to mitigate pollution and reduce global plastic waste. The discovery of bacteria that can feed on plastic has sparked interest in their potential to clean the ocean of plastic waste. Researchers are now focused on understanding the biodegradation mechanisms and the role of bacterial enzymes in breaking down different polymers. The development of engineered microbes and enzymes capable of degrading multiple types of plastics is an ongoing area of research, with the goal of creating unique collaborations between academic institutions and industries to address this global issue.
| Characteristics | Values |
|---|---|
| Microbes that biodegrade plastic | Bacteria, worms, caterpillars |
| Types of plastic degraded | PET, polyethylene, polypropylene, polyethylene terephthalate, polythene, microplastics |
| Biodegradation byproducts | Carbon dioxide, water, decayed biomass, ethylene glycol |
| Biodegradation techniques | Enzymes, gene-specific and genome-wide engineering tools, computational tools |
| Biodegradation challenges | Long-chain polymers, high molecular weight, hydrophobicity, crystallinity, lack of essential nutrients in plastic |
| Biodegradation reaction time | Estimated to range between 1-400 hours in the marine environment |
| Biodegradation research focus | Improving efficiency, exploring bacterial enzymes, developing multi-enzyme systems, understanding metabolic processes |
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What You'll Learn
Plastic-eating microbes and enzymes
Plastic pollution is a pressing issue, with over 75% of plastic waste remaining in landfills, soils, or oceans for decades. The increasing presence of plastics in the environment has led to the evolution of certain microbes that can degrade plastics. These plastic-eating microbes and enzymes have the potential to mitigate global plastic waste and pollution.
In 2001, microbiologist Kohei Oda and his colleagues discovered bacteria at a rubbish dump that could fully break down plastic into basic nutrients. This finding sparked interest in the potential of microbes to address plastic pollution. Since then, scientists have been working to develop and engineer microbes and enzymes that can effectively break down multiple types of plastics.
One approach is to identify microbes from natural sources that have the ability to survive on plastics as their sole food source and then enhance their plastic-degrading capabilities through synthetic biological techniques. For example, the Ideonella sakaiensis PETase enzyme has been engineered to break down PET plastic, and a German group has engineered this enzyme into marine algae, which could be used to tackle microplastics in the ocean.
Another strategy is to create unique collaborations between academic institutions, industry, and investors to accelerate the development and deployment of plastic-eating microbes. For instance, a French company named Carbios has been using a bacterial enzyme to process PET plastic waste since 2021. Additionally, the Wyss Institute at Harvard University is working on a plastic degradation project, aiming to create plastivores or super-microbes that can efficiently degrade multiple types of plastics.
While the field of biodepolymerization research is still evolving, the potential of plastic-eating microbes and enzymes is significant. By optimizing enzymes through genetic engineering, scientists aim to enhance the efficiency of plastic degradation. However, it is important to note that most reported cases of enzyme- or microbe-mediated plastic degradation are slow and incomplete, and challenges remain in making these processes faster and more cost-effective. Nonetheless, the ongoing research and collaboration in this field offer hope for a sustainable solution to the global plastic crisis.
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Engineered microbes
The development of engineered microbes involves identifying microbes from natural sources and enhancing their pre-existing ability to survive on plastics as their sole food source. This process, known as "bio-prospecting" or bioprospecting, involves isolating and studying microbial strains that can decompose and bio-assimilate multiple types of plastics into harmless substances such as carbon dioxide, water, and decayed biomass.
Once these microbial strains are identified, synthetic biological techniques, including gene-specific and genome-wide engineering tools, are applied to accelerate the evolution of faster and more robust plastic-eating microbes. This process involves characterizing the microbes' plastic-metabolizing enzymes and pathways using analytical chemistry and next-generation sequencing.
For example, a German group engineered the Ideonella sakaiensis PETase into marine algae, which could potentially be used to break down microplastics in the ocean. Additionally, a French company named Carbios has been using a bacterial enzyme to process PET plastic waste, breaking it down into its precursor molecules.
While the development of engineered microbes shows promise, it is important to note that most reported cases of enzyme- or microbe-mediated plastic degradation are incomplete and slow. Scientists face the challenge of not only improving the efficiency of these processes but also making them cost-effective in a competitive marketplace.
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Microbial enzymatic degradation
The process of microbial enzymatic degradation can be classified into four steps: attachment/colonization, bio-fragmentation, assimilation, and mineralization. During attachment/colonization, microorganisms form a biofilm on the surface of plastics, altering their hydrodynamics and facilitating the degradation process. The biofilm formation allows for the excretion of extracellular enzymes, which initiate the breakdown of plastic polymers.
The rate of microbial enzymatic degradation depends on various factors, including the chemical structure, molecular weight, and degree of crystallinity of the plastic. Highly crystalline polymers, such as polyethylene, are more resistant to degradation due to their rigid structure. On the other hand, biodegradable plastics with flexible chains and abundant functional groups are more susceptible to enzymatic attacks, making them easier to break down.
Engineered plastic-eating microbes, or "plastivores," have emerged as a potential solution to enhance the degradation process. Researchers are identifying microbes from natural sources and evolving their abilities to survive on plastics as their sole food source. By applying synthetic biological techniques, such as gene-specific and genome-wide engineering, scientists aim to create faster and more robust plastic-eating microbes. These engineered microbes could then be deployed globally to decompose waste plastics and mitigate environmental pollution.
While the field of microbial enzymatic degradation has made significant advancements, there are still challenges to be addressed. The complexity of plastic compositions, including the presence of long-chain polymers, high molecular weight, and hydrophobicity, poses obstacles to degradation. Additionally, the lack of essential nutrients in plastics, such as nitrogen, hinders microbial growth and degradation efficiency. Nevertheless, with continued research and collaboration across various sectors, the development of efficient plastic-degrading microbes holds great promise in combating the global plastic pollution crisis.
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Microbes and worms
The vast majority of plastic waste ends up in landfills, soils, or oceans, contaminating the environment and posing serious ecological problems. As such, there is a pressing need to find ways to decompose commercial plastics.
Microbes and enzymes capable of degrading multiple types of plastics could help reduce global plastic waste and mitigate pollution. These plastic-eating microbes could be deployed globally to decompose waste plastics and tackle the plastics crisis.
In 2016, researchers in Japan discovered a microbe that could completely break down PET plastic into carbon dioxide and water. This was a significant advancement as, prior to this discovery, it was not known that bacteria capable of digesting plastic existed.
Since then, scientists have continued to develop and engineer plastic-eating microbes. For example, a German group engineered the Ideonella sakaiensis PETase into marine algae, which could potentially be used to break down microplastics in the ocean.
However, it is important to note that the process of making these technologies faster and more efficient is challenging. As of 2018, it was reported that plastics recycling with microbes and worms is further away than people think. The degradation of plastics by microbes and worms is a developing field, and further research is needed to fully understand the potential of these technologies.
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Biodegradation of plastics and microplastics
The increasing presence of plastics in the environment has led certain bacterial species to evolve and adapt to degrade plastics into harmless by-products. These include species in the genera Gracilibacillus, Enterobacter, and Bacillus, which are capable of polyhydroxyalkanoate biodegradation.
The biodegradation of plastics by microbes is a significant area of research, given the ecological problems caused by plastic and microplastic pollution. The potential of microbes to break down plastics was first discovered by Kohei Oda and his colleagues in a rubbish dump in 2001. They found bacteria that were breaking down plastic fully and processing it into basic nutrients. Since then, scientists have been working to develop and engineer microbes that can break down plastics efficiently and safely.
One of the challenges in plastic biodegradation is the presence of long-chain polymers, high molecular weight, hydrophobicity, and crystallinity in plastics, which make them difficult to break down. However, certain bacteria have been found to utilize oxygenase to initiate biodegradation, making the material more susceptible to degradation.
Recent studies have focused on the development of multienzyme systems, such as the I. sakaiensis strain, which has a dual-enzyme system containing PETase and MHETase. This system has evolved to utilize crystalline polyester substrates, and improved enzymes have shown the ability to degrade 90% of plastic products within 10 hours.
Engineered plastic-eating microbes have the potential to be deployed globally to mitigate environmental plastic pollution and reduce plastic waste. For example, a French company named Carbios has been using a bacterial enzyme to process PET plastic waste since 2021. Additionally, a German group has engineered the Ideonella sakaiensis PETase into marine algae, which could be used to break down microplastics in the ocean. These developments showcase the potential for microbes to play a significant role in addressing the global plastic crisis.
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Frequently asked questions
Plastic degradation is when microbes break down plastics into less harmful by-products, turning them into biodegradable materials.
Microbes have evolved to break down plastics into basic nutrients. They can also be engineered to break down plastics more efficiently.
Some examples of microbes that can biodegrade plastic include Ideonella sakaiensis, P. aeruginosa, Streptomyces sp., Aspergillus niger, Staphylococcus aureus, and Rhizopus sp.
Microbes use plastic-metabolizing enzymes and pathways to biodegrade plastic. They can also use a two-enzyme system to break down plastic waste.
Using microbes to biodegrade plastic can help reduce global plastic waste and mitigate pollution. Engineered microbes can be deployed globally to decompose waste plastics and address the plastics crisis.
