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Turning a Natural Biopolymer-Binding Protein into a Plastic Surface-Recognizing Protein
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Scientists re-engineered a natural protein (originally designed to grip onto materials like crab shells) so it instead sticks to plastics like PET, polystyrene, and polyethylene. In lab tests, this modified protein successfully "lit up" microplastic particles pulled from real seawater samples, acting like a highlighter for plastic contamination. This matters because better tools to detect microplastics could eventually help researchers track how much plastic pollution is in our water and environment, an important step toward understanding our exposure to these particles, though this study doesn't yet address direct health effects.
Abstract Type A carbohydrate-binding modules (CBMs) preferentially recognize crystalline polysaccharides such as cellulose and chitin, yet some can also bind synthetic plastics, suggesting that their recognition properties can be redesigned through protein engineering. Here, we used directed evolution to alter the substrate specificity of the archaeal chitin-binding protein PfChBD2 toward plastics. Two rounds of evolution, targeting surface residues and conserved aromatic residues, were screened by phage display, yielding mutants with markedly reduced chitin affinity and distinct PET-binding profiles characterized by apparent binding parameters. Structural modeling indicated that substitutions altering surface electrostatics and hydrophobicity contributed to the shift in substrate preference. When fused to a fluorescent tag, the engineered proteins bound several plastics, including PET, PS, PE, and PP, while showing minimal interaction with natural polysaccharides. The proteins also stained microplastics collected from seawater, demonstrating their potential for environmental detection. This study further demonstrates CBMs as evolutionarily adaptable scaffolds capable of recognizing synthetic polymers and highlights the potential of engineered CBM-based probes for microplastic detection, polymer analysis, and biotechnological and environmental applications.
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Surface plasmon resonance biosensor with plastic-binding peptide for nanoplastic detection in environmental water
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Scientists have developed a new sensor that can quickly detect tiny plastic particles (nanoplastics) in water by using a special protein that sticks to plastic like a magnet. This matters because nanoplastics are so small they're hard to find with current tools, yet they may pose health risks if they end up in our water supply — this device could help researchers and water quality experts spot contamination faster and more easily, even in real pond and aquarium water. While still an early-stage lab tool, it's a promising step toward better monitoring of plastic pollution that could eventually protect drinking water safety.
Peptide-based strategies for detecting microplastics in aquatic systems: A review
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This review explores the emerging use of specially designed peptides that can bind to specific types of plastic for detecting microplastics in water. Researchers describe how advances in protein engineering and computational design have enabled the creation of peptides that selectively recognize different polymer surfaces. The peptide-based approach offers a promising new detection method that could complement existing techniques for monitoring microplastic pollution in aquatic environments.
Multispectroscopic investigations of the binding interaction between microplastics and actin protein
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Scientists found that tiny plastic particles can physically bind to actin, a protein that helps give our cells structure and lets them move. Some plastic types (like polystyrene) stuck more strongly than others, and this binding actually changed the protein's shape. This matters because if microplastics build up in our cells and distort important proteins, it could interfere with how cells normally function.
Selective Recognition and Portable Quantification of PVC Microplastics Using a Water-Soluble AIE Fluorescent Probe
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Scientists created a special glow-in-the-dark dye that lights up specifically when it touches PVC microplastics—a common but concerning type of plastic pollution—in water samples like tap water, lake water, and even seawater. This matters because right now it's hard to quickly identify which type of microplastic is contaminating our water, and this simple test could help researchers track PVC pollution (which can release harmful chemical additives) more easily, without needing complicated lab equipment. While this study focused on detection technology rather than health effects directly, better tools like this are an important step toward understanding and monitoring our exposure to potentially harmful plastics
Plastic Analysis with a Plasmonic Nano-Gold Sensor Coated with Plastic-Binding Peptides
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Researchers developed a nano-gold sensor coated with plastic-binding peptides to detect common plastic polymers including polyethylene, PET, polypropylene, and polystyrene at very small scales. When tested on freshwater mussels deployed at suspected pollution sites, the sensor detected higher plastic levels near rainfall overflow and urban areas compared to treated municipal effluent sites.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.