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AI-designed protein coverings called WRAPs offer a way to keep selected membrane proteins soluble in water without the detergent-extraction step used in conventional workflows. The covering is fused to the target protein: its hydrophobic side faces the target’s membrane-facing surface, while its hydrophilic exterior faces water. Early experiments report soluble, functional examples, but the method is not yet shown to work for every membrane protein.
Why membrane proteins are difficult to work with in water
Many membrane proteins sit within or pass through a cell’s lipid membrane. Their outward-facing surfaces are adapted to interact with lipids, not water. When a protein is removed from that environment, those hydrophobic surfaces can make it aggregate or lose its structure and activity.
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A conventional workaround is to extract the protein with detergents. Detergent molecules shield the hydrophobic surface, helping the protein remain in solution. The process can be tedious and involve multiple steps, and the detergent environment may limit downstream experiments or applications, according to UW Medicine’s July 2, 2026 report.
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The peer-reviewed Science paper uses WRAP to mean “Water-soluble RFdiffused Amphipathic Proteins.” A WRAP is a custom-designed protein covering fused to a membrane-protein target. Its amphipathic design places a hydrophobic interior against the target’s lipid-facing surface and a hydrophilic exterior toward the surrounding water. The resulting fused complex can be produced and purified from a soluble fraction, bypassing conventional detergent extraction in the reported workflow.
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The intended advantage is that the target’s sequence is retained rather than being converted into a different, water-soluble sequence. The PubMed abstract for the paper describes the design goal as preserving the target’s sequence, fold, active site and ligand-binding properties. Those are goals supported by selected experimental demonstrations, not a guarantee for every target.
How WRAPs compare with other approaches
| Approach | What happens to the target | Detergent extraction | What the evidence shows |
|---|---|---|---|
| Detergent extraction | The membrane protein is extracted while detergent molecules shield its hydrophobic surface. | Yes; it is the conventional workflow described by UW Medicine. | A standard preparation approach, though the process can be multistep and constrain downstream work. |
| WRAP coverings | A designed protein covering is genetically fused to the target; the target sequence is retained. | The reported workflow bypasses detergent extraction. | Experiments cover selected beta-barrel outer-membrane proteins and helical multipass proteins, with reported functional and structural demonstrations. |
| Designed soluble analogues | The membrane protein itself is computationally redesigned into a soluble version of its fold. | The approach is distinct from detergent extraction and from adding a WRAP covering. | A 2024 Nature study demonstrated selected claudin, rhomboid protease and GPCR-fold analogues; this is a separate design strategy, not a WRAP result. See the Nature study. |
What the experiments demonstrate
More than one membrane-protein architecture
The 2025 preprint reports WRAP designs for beta-barrel outer-membrane proteins and helical multipass transmembrane proteins. The later peer-reviewed paper, “Membrane protein solubilization and structure determination using de novo-designed proteins,” reports selected soluble targets that retained binding or enzymatic function and showed enhanced stability. These results establish a proof of concept across particular targets and classes, not broad success across the membrane-protein universe.
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A structure of a WRAPed porin
UW Medicine reports a cryo-electron microscopy structure of a WRAPed mycobacterial porin at 2.95 Å resolution. That resolution describes this specific structural result; it is not a success rate or a general measure of how well WRAPs work.
Potential research use for bacterial antigens
The work also describes soluble outer-membrane antigens from Treponema pallidum, the bacterium that causes syphilis. Making such antigens easier to study could support vaccine and diagnostic research. It does not establish an approved vaccine or diagnostic, or show a clinical benefit.
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What WRAPs do not yet establish
- They do not show that every membrane protein can be made soluble this way; the evidence concerns selected experimental targets.
- Reported function and ligand-binding results are specific to tested proteins, not proof that all targets preserve activity after fusion.
- The method is a research demonstration, not evidence that a clinical vaccine, diagnostic or drug-development outcome has been achieved.
- UW Medicine reports a filed patent application, but a patent application does not establish that a product is commercially available.
The UW Medicine account quotes David Baker, professor of biochemistry at the University of Washington School of Medicine and director of the UW Medicine Institute for Protein Design: “Membrane proteins are notoriously difficult to work with. We needed to find a way to keep them intact in water.” Lead author Ljubica Mihaljevic said: “I’m excited to finally release our WRAP approach to the broader scientific community and to see how it accelerates discovery in the membrane protein field.”
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