Researchers Mapped Synaptic Proteins With New PhoxID Method
The newly developed transmembrane PhoxID method enables simultaneous mapping of proteins across both sides of the plasma membrane.
Updated on Oct. 5, 2026 in Life Sciences
Researchers have developed a proximity labelling technique called transmembrane PhoxID, which uses singlet oxygen to label proteins on both the extracellular and intracellular sides of a membrane. This new tool allowed the team to map interactomes in living mouse brains.
Why it matters
Traditional proximity labelling approaches are limited by their focus on only one side of transmembrane proteins, often missing the full architecture of signaling complexes. This method enables a more comprehensive view of how proteins organize at the synapse.
The PhoxID method utilizes an extracellularly anchored photosensitiser to generate singlet oxygen—a highly reactive, short-lived form of oxygen—that can diffuse across the plasma membrane. By labeling both sides simultaneously, it revealed previously invisible transsynaptic nanocolumn components.
The players
Transmembrane PhoxID
A novel proximity labelling technique that uses photosensitized singlet oxygen to tag proteins on both sides of a plasma membrane simultaneously.
The details
The technique works by tagging membrane-proximal intracellular interactomes—the network of proteins interacting with a specific target—at parallel fibre-Purkinje cell synapses. By generating permeable singlet oxygen, the method can tag neighboring molecules on either side of the cell membrane, allowing researchers to see protein networks as they exist in vivo. This provided the first glimpse of specific components within synaptic nanocolumns that were previously difficult to distinguish.
Timeline
October 5, 2026: The research findings were formally published.
The Tech Race
This development marks a departure from standard mapping efforts that treat the synapse as a static, monolithic structure. By resolving protein networks at the nanoscale, it advances the race to define the physical interactome—the total set of molecular interactions—that governs neuronal signaling.
This is a research-stage method currently used by biologists to better map the architecture of brain synapses. It does not yet impact clinical diagnostics or consumer medical technology, but it provides a foundational tool for researchers studying the mechanics of neurological interactions.
The takeaway
The study demonstrates that our understanding of synaptic protein organization has been constrained by one-sided labeling techniques. Researchers should track the application of this method in future studies to see if the identified GABAR-CAMKV interaction is found in broader clinical neurological assessments.
Further reading
For broader developments in molecular architecture, visit our Life Sciences section.
More information
View the original scientific research article to see the full data set.
Source note: This article includes information reported by Nature.
