Researchers are now using E. coli bacteria to manufacture ice-binding proteins, potentially revolutionizing organ preservation. Forget painstakingly extracting these proteins from ice fish—a process that’s both ethically challenging and logistically difficult. This new method offers a scalable, precise way to create and modify these crucial compounds.
Bacteria-Built Antifreeze: A Leap for Organ Storage?
Scientists have engineered a new family of proteins, created with the help of bacteria and artificial intelligence, that remain stable at a wider range of temperatures than those found in nature, opening doors for improved organ and tissue preservation.
- A team of researchers developed artificial ice-binding proteins using AI and E. coli bacteria.
- These new proteins are more stable and versatile than naturally occurring versions.
- The breakthrough could simplify organ storage, eliminating the need for specialized cooling equipment.
- A €150,000 grant will support the development of practical applications for this technology.
“In the chemical biology laboratory at TU/e, we use bacteria to produce ice-binding proteins for us,” explained Voets. “This way, we don’t have to isolate them from ice fish for our research. That’s not only better for the ice fish, but also useful for us, because it allows us to tinker with the protein structure very precisely in order to find out which parts are essential for the function of the proteins.”
Q: How do these artificially designed proteins differ from those found in nature?
A: Naturally occurring ice-binding proteins often lose their functionality at room temperature. The newly developed proteins maintain stability across a broader temperature spectrum, making them far more practical for applications like organ storage, where consistent cooling isn’t always feasible.
AI-Designed Proteins and Advanced Microscopy
The team, collaborating with Wageningen University & Research and Washington University, employed artificial intelligence to design proteins with specific desired properties. These artificial proteins are then produced in the lab using E. coli bacteria. Researchers then study how these proteins interact with ice crystals under various conditions.
A recent paper published in PNAS details this entirely new family of artificially designed proteins. Voets notes that these proteins are more stable, active, and versatile than their naturally occurring counterparts. “Naturally occurring ice-binding proteins are generally only found in cold environments. Some of these proteins already lose their characteristic folding and thus their ability to bind ice at room temperature. The new class of proteins we developed remains stable in a much wider temperature range.”
Practical Applications and Future Impact
The potential applications are significant. Voets envisions adding these proteins to human organs to facilitate their preservation for storage. “Imagine that you would want to add such proteins to human organs to freeze them for storage. The fact that these proteins don’t need to be kept at low temperatures to remain functional makes the handling a lot easier, as you do not need special cooling equipment or expertise.”
According to Voets, the success of this project is due to a convergence of factors. “There has been huge progress in computational methods for designing these proteins. At the same time, the world’s most powerful super-resolved fluorescence microscopes are available at the ICMS Advanced Microscopy Facility (AMF), allowing us to track individual proteins on ice for the first time.” Interdisciplinary collaborations with biomedical engineers at the Institute for Complex Molecular Systems, cardiologists at Utrecht University Medical Center, and transplant surgeons at University Medical Center Groningen were also essential.
From Lab to Real-World Product
Tim Hogervorst, a postdoctoral researcher from the Self-Organizing Soft Matter group, discovered a way to transfer the essential properties of these proteins to polymer-based materials, enabling scalable and cost-effective production. Voets and Hogervorst are now collaborating with The Gate to translate this discovery into a practical product.
A €150,000 Proof of Concept grant from the European Research Council will support this effort, paving the way for the pragmatic use of these new antifreeze materials and marking a critical step toward improving tissue and organ preservation.
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