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How a designed nanopore can act as a sensor
A nanopore is a tiny opening through a membrane. In an ionic-current readout, ions move through the pore; a molecule entering or interacting with the channel can change the measured signal. To turn a pore into a sensor, researchers need both a pore architecture that works in a membrane and a way for the target molecule to produce a distinguishable signal.
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In the most direct example here, Shimizu and colleagues designed SV28, a β-hairpin peptide chemically synthesized to assemble into pores in lipid bilayers. Their study, published online in 2021 and appearing in Nature Nanotechnology in 2022, reported pore diameters ranging from 1.7 to 6.3 nm. The authors reported DNA detection using SV28. They then introduced a glycine-kink redesign, SVG28, which formed a reported monodisperse 1.7 nm pore; with that pore, they reported detection of a single polypeptide chain. These are separate demonstrations, not evidence that one pore size detects every kind of molecule.
The study’s result is significant because it shows that a designed peptide can assemble into a membrane pore with sensing capability. The measurements were made in an experimental membrane system; the findings do not establish a packaged diagnostic or a clinically validated test. Read the paper: De novo design of a nanopore for single-molecule detection that incorporates a β-hairpin peptide.
What “designed from scratch” means—and what it does not
In de novo design, researchers create a protein or peptide architecture rather than simply modifying a natural pore. But the phrase can be used loosely when several different kinds of engineered biosensors are discussed together. A pore-forming peptide, a luminescent protein switch and a designed component added to a natural pore are related efforts, not interchangeable devices.
| Approach | What is designed or modified | Reported target or use | Readout or evidence |
|---|---|---|---|
| Designed peptide pore | SV28, a synthetic β-hairpin peptide; SVG28 is a redesigned variant | DNA detection with SV28; single-polypeptide-chain detection with SVG28 | Nanopores in lipid bilayers; reported pore diameters of 1.7–6.3 nm for SV28 and a monodisperse 1.7 nm pore for SVG28, in the 2021/2022 study |
| Designed protein switch | A modular sensor protein that changes state when its target binds | Targets reported include BCL-2, HER2, cardiac troponin I and SARS-CoV-2 spike | Analyte-triggered luminescence, not nanopore ionic current; 2021 study |
| Semisynthetic pore | Designed subunits integrated into the natural CsgG pore | Engineered pore behavior; the cited study reports altered current–voltage responses | 18-subunit, 315-kDa complex, with rectification and cryo-electron microscopy confirmation of the designed lumen architecture; 2026 study |
| Binder-functionalized pore | A programmable antibody-mimetic binder fused to a monomeric nanopore | Protein targets; the recognition interface can be changed for different targets | Nanopore sensing; the pore itself is not described as designed entirely from scratch |
The table compares distinct experimental strategies, not products tested head-to-head. The cited papers do not establish equivalent assays or directly comparable performance figures across these approaches.
Protein switches can sense targets without a nanopore
Quijano-Rubio and colleagues’ 2021 modular biosensor platform uses a designed protein switch rather than a pore. In the reported design, target binding shifts the sensor from a closed, dark state to an open, luminescent state. The resulting light signal is the readout; there is no nanopore ionic-current measurement in this approach.
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Some engineered nanopores retain a natural scaffold
Not every designed pore is wholly artificial. In a 2026 study, Schnaider and colleagues integrated designed subunits into CsgG, a natural pore. The resulting semisynthetic complex contained 18 subunits and had a reported mass of 315 kDa. The paper reports altered current–voltage behavior, including rectification, and cryo-electron microscopy confirmation of the intended lumen architecture. This is an example of designing around a natural scaffold, not creating the entire pore from scratch. Read De novo design of semisynthetic conduction pores.
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Recognition binders offer another route to protein sensing
A separate nanopore-sensor study describes fusing a programmable antibody-mimetic binder to a monomeric pore. Changing the recognition interface allows the sensor to be adapted to different protein targets. In this strategy, the binder supplies target recognition while the nanopore remains the sensing component; it does not make the pore itself wholly de novo. See A generalizable nanopore sensor for highly specific protein detection at single-molecule precision.
How to interpret the newer nanopore results
A 2026 Nature Biotechnology study reports 98.7% overall accuracy across its analyte-identification task using an engineered MspA nanopore and a chemical adaptor. MspA is an existing natural pore, so this is adjacent context—not evidence for a wholly designed protein pore. The reported accuracy belongs to that study’s particular task and should not be read as a general clinical accuracy figure or compared directly with the SV28 demonstrations. The paper is An engineered nanopore identifies saccharides, amino acids, peptides and ribonucleotides.
Other work explores nanopores alongside protein processing. For example, a Nature Chemistry paper is titled Bottom-up fabrication of a proteasome–nanopore that unravels and processes single proteins. That title signals a related research direction, but it is not the same demonstration as designing a peptide pore to detect DNA or a single polypeptide chain.
What the studies show—and what remains unestablished
Taken together, these studies show several ways protein engineering can contribute to biosensing: create a pore-forming peptide, build a target-responsive luminescent switch, redesign components around a natural pore, or attach a recognition binder to a pore. The evidence described here is from research demonstrations. It does not establish that these systems are available as consumer biosensors or validated clinical tests.
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