Microscopic enzymes breaking down pollutants in water

Ligninolytic Enzymes: Nature's Tiny Warriors Against Water Pollution

Soraya Malik monogram
Soraya Malik in Climate & Environment October 2026 • 4 min read.

"Discover how these natural biocatalysts are revolutionizing wastewater treatment by targeting endocrine-disrupting chemicals (EDCs)."


In today's world, clean water is more critical than ever. Municipal wastewater plants release endocrine-disrupting chemicals (EDCs) into our freshwaters, threatening the environment and public health. These chemicals, found in everyday products, interfere with hormone systems, leading to developmental and reproductive issues in both humans and animals.

Traditional wastewater treatments often fall short in fully removing EDCs, making it necessary to develop innovative solutions. One promising answer lies in ligninolytic enzymes, nature’s own biocatalysts. These enzymes possess unique catalytic properties that break down a wide range of organic compounds, offering a versatile tool for wastewater treatment.

This article explores how ligninolytic enzymes, specifically laccase, manganese peroxidase, and versatile peroxidase, can eliminate EDCs from wastewater. We'll also propose a new wastewater treatment approach that integrates these enzymes for more effective and sustainable water purification.

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Where EDCs Persist

Endocrine-disrupting chemicals (EDCs) can mimic or interfere with hormones, potentially causing developmental, reproductive, brain, and immune-related problems. Wastewater treatment plants are identified as hotspots where EDCs, pharmaceuticals, personal care products, and active pharmaceutical ingredients can enter aquatic networks. EDCs are frequently reported in surface waters downstream of wastewater treatment plants, effluent-dominated rivers, and reservoirs affected by urban and industrial watersheds.

Why Ligninolytic Enzymes Could Be the Future of Wastewater Treatment

Microscopic enzymes breaking down pollutants in water

Ligninolytic enzymes (LEs) stand out due to their ability to tackle a broad spectrum of organic pollutants, including endocrine-disrupting chemicals (EDCs). The enzymes laccase, manganese peroxidase (MnP), and versatile peroxidase (VP) have high redox potentials, enabling them to oxidize and neutralize various harmful compounds. Beyond just degrading lignin, these enzymes have shown promise in bioremediation and wastewater treatment, making them invaluable for environmental applications.

These enzymes are adept at transforming complex aromatic compounds like PAHs, PCBs, and pesticides, which are known to disrupt the endocrine system. The potential of laccase and MnP in wastewater treatment has been well-researched, though information on VP is still emerging. VP's hybrid molecular structure makes it particularly promising for EDC elimination, especially because it doesn't need redox mediators, unlike laccase.

  • Laccases (EC.1.10.3.2): Multicopper oxidases that use molecular oxygen to oxidize aromatic compounds. They work best in specific pH and temperature conditions and are widely distributed in various organisms.
  • Manganese Peroxidase (EC.1.11.1.13): It oxidizes Mn2+ to Mn3+, which then degrades phenolic substrates. Though mainly studied in fungi, it shows significant potential in modifying lignin.
  • Versatile Peroxidase (EC.1.11.1.16): A hybrid enzyme combining properties of MnP and lignin peroxidase (LiP), making it effective against a range of pollutants. Produced by certain ligninolytic fungi, VP is noted for its high redox potential.
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Laccases in Emerging Research

Research on thermophilic fungal isolates describes laccases as ligninolytic enzymes that can act as biocatalysts. These enzymes have been applied to transform a wide range of phenolic and nonphenolic substrates. A separate 10-year overview of bacterial laccases identifies large-scale production, operational problems, and the use of genetic and protein engineering as important issues for advancing xenobiotic degradation in water.

Limits to Scale

Despite its potential applications, lignin peroxidase has not yet been commercially exploited because commercial preparations are scarce and expensive. Reviews also report that large-scale use of ligninolytic enzymes remains limited by insufficient production. For laccases specifically, complex contaminated media, high salt concentrations, and extreme pH values can affect protein stability, recovery, and recycling.

Different Laccase Outcomes

A laccase cocktail from Pycnoporus sanguineus CS43 achieved approximately 89–100% biodegradation of bisphenol A, nonylphenol, ethynylestradiol, and triclosan in synthetic samples containing 10 mg L−1 of each compound, using 100 U L−1 enzyme activity. Immobilized laccase from Cerrena unicolor eliminated 80% of bisphenol A, 40% of nonylphenol, and 60% of triclosan from solutions containing 50 μmol of each micropollutant separately. These results show strong but variable removal performance across enzyme systems, pollutants, and test conditions.

Each enzyme offers unique benefits, making them suitable for different treatment scenarios. Laccases are effective but sometimes need mediators for non-phenolic compounds, while MnP and VP can handle a broader range of pollutants, with VP showing particular promise due to its unique molecular attributes.

A Vision for Cleaner Water: Integrating Enzymes into Treatment Processes

Ligninolytic enzymes offer a powerful, sustainable solution for eliminating EDCs and other pollutants from wastewater. By integrating these enzymes into existing treatment technologies, we can prevent harmful chemicals from entering our waterways, safeguarding both environmental and public health. As research continues and new applications emerge, the potential of ligninolytic enzymes to revolutionize wastewater treatment is vast, promising a future of cleaner, safer water for all.

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Treatment Beyond Conventional Systems

Conventional treatment systems may not effectively remove endocrine-disrupting chemicals from wastewater. The fate of these chemicals should therefore be carefully monitored in wastewater treatment plant effluent. The cited review identifies additional treatment methods, including advanced oxidation processes, as options for removing endocrine disruptors.

Enzyme treatment compared with other removal routes

Reported removal outcomes differ sharply by treatment context. Sedimentation removed less than 28% of diclofenac and estriol, whereas a Pleurotus ostreatus bioreactor removed about 95% of EDCs and also suppressed estrogenic activity.[1] [2]

Ligninolytic enzymes occupy the biological-treatment part of this broader landscape. Their reported use includes biodegradation and decolorization of industrial waste and xenobiotic compounds.[1] [3]

What the immobilized-laccase figures mean in practice

  • 86.4 % activity retainedAn immobilized enzyme retained 86.4% of its activity at 4 °C over 30 days. This is a stability result, not a percentage of EDC removed.[4]
  • 2-5 pHIts enhanced stability was observed across pH 2-5, defining the tested stability range rather than proving effectiveness across all wastewater conditions.[4]

What enzyme deployment must still demonstrate

  • Scale-up remains unresolved because reported barriers include rapid enzyme denaturation, limited reuse of free enzyme, and the need for large catalyst quantities that increase cost.[5]
  • For laccase-based treatment, mediator-assisted removal can be difficult to transfer into treatment systems: high mediator concentrations may be required, and remediation products may form at concentrations higher than the original pollutant.[5]
  • The properties of the target chemical, including hydrophilicity, pH behavior, acid solubility, water partitioning, degradability, and polarity, can shape treatment limitations and outcomes.[1]

The vocabulary behind enzyme-assisted treatment

Mediator
A mediator is an added factor that enhances enzyme activity and helps facilitate degradation and detoxification.[3]
White-rot fungi
White-rot fungi are wood-decomposing fungi associated with extracellular lignin peroxidase production.[6]

Questions about combining enzyme treatment with wastewater systems

Which pollutants can oxidative lignin enzymes target?

Reported targets include pharmaceuticals, phenolics, chlorinated phenols, PAHs, EDCs, and other pollutants.[6]

Sources

  1. Treatment strategies for enhancing the removal of ... (sciencedirect.com)
  2. Biodegradation of endocrine disruptors in urban wastewater using Pleurotus ostreatus bioreactor - PubMed (pubmed.ncbi.nlm.nih.gov)
  3. Ligninolytic enzymes and its mechanisms for degradation of lignocellulosic waste in environment - PMC (pmc.ncbi.nlm.nih.gov)
  4. Preparation and application of laccase-immobilized magnetic biochar for effective degradation of endocrine disruptors: Efficiency and mechanistic analysis - PubMed (pubmed.ncbi.nlm.nih.gov, 2025)
  5. Current Challenges for Biological Treatment of Pharmaceutical-Based Contaminants with Oxidoreductase Enzymes: Immobilization Processes, Real Aqueous Matrices and Hybrid Techniques (pmc.ncbi.nlm.nih.gov, 2022)
  6. Biocatalytic Functionalities of Lignin Peroxidase-Based Systems in Lignin Depolymerization and Pollutants Removal from Environmental Matrices | Current Pollution Reports | Springer Nature Link (link.springer.com)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

Everything You Need To Know

1

What are endocrine-disrupting chemicals (EDCs) and why is there a growing concern about them in our water resources?

Endocrine-disrupting chemicals (EDCs) are compounds found in everyday products that can interfere with hormone systems in humans and animals, potentially leading to developmental and reproductive issues. There is a growing concern due to their prevalence in municipal wastewater and the limitations of traditional wastewater treatments in fully removing them, posing a threat to both environmental and public health. This is creating a demand for innovative solutions like the use of specific enzymes that target these pollutants for a sustainable water purification.

2

How do ligninolytic enzymes contribute to solving the problem of endocrine-disrupting chemicals (EDCs) in wastewater?

Ligninolytic enzymes, including laccase, manganese peroxidase (MnP), and versatile peroxidase (VP), possess catalytic properties that enable them to break down a wide range of organic pollutants, including EDCs. These enzymes oxidize and neutralize harmful compounds, providing a versatile and environmentally friendly tool for wastewater treatment by preventing these chemicals from entering our waterways.

3

Could you explain the unique properties of Laccase, Manganese Peroxidase (MnP), and Versatile Peroxidase (VP) and their roles in wastewater treatment?

Laccases are multicopper oxidases that use molecular oxygen to oxidize aromatic compounds, functioning optimally under specific pH and temperature conditions, but may require mediators for non-phenolic compounds. Manganese Peroxidase (MnP) oxidizes Mn2+ to Mn3+, which then degrades phenolic substrates, showing potential in modifying lignin. Versatile Peroxidase (VP) is a hybrid enzyme that combines properties of MnP and lignin peroxidase (LiP), making it effective against a range of pollutants without needing redox mediators. Each enzyme offers distinct benefits, making them suitable for different wastewater treatment scenarios.

4

What are the advantages of using Versatile Peroxidase (VP) compared to other ligninolytic enzymes like Laccase in eliminating endocrine-disrupting chemicals (EDCs)?

Versatile Peroxidase (VP) has a hybrid molecular structure combining the properties of Manganese Peroxidase (MnP) and lignin peroxidase (LiP), making it effective against a broader range of pollutants. Unlike Laccase, VP does not require redox mediators to function. This makes VP particularly promising for EDC elimination, especially in complex wastewater environments where mediators might not be readily available or effective.

5

What is the vision for integrating ligninolytic enzymes into existing wastewater treatment processes, and what impact could this have on water quality and public health?

The vision involves incorporating enzymes such as laccase, manganese peroxidase, and versatile peroxidase into current treatment technologies to enhance the elimination of EDCs and other pollutants from wastewater. By doing so, harmful chemicals can be prevented from entering waterways, ensuring cleaner and safer water resources. This integration would safeguard both environmental and public health, reducing the risks associated with exposure to EDCs and improving overall water quality.

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