Split GFP Fluorescent Biosensors Visualize Real-Time Dynamics of ER-Golgi Membrane Contacts with Super-Resolution Imaging

July 5, 2026

Research Article UK

Overview

Researchers have developed gene-encoded fluorescent biosensors utilizing a split GFP/YFP system to specifically label and dynamically observe ER-Golgi membrane contact sites. These advanced probes enable super-resolution imaging to elucidate the real-time structural dynamics of these contact sites in living cells. They effectively capture changes during critical cellular events such as cell division, ER stress, and the disappearance during mammalian neuron development, providing a powerful tool for investigating ER-Golgi interactions in various physiological and pathological contexts.

In Depth

Key Findings

Researchers have developed gene-encoded fluorescent biosensors utilizing a split GFP/YFP system, enabling specific labeling and dynamic observation of membrane contact sites between the endoplasmic reticulum (ER) and Golgi apparatus within cells in real-time. These innovative probes offer a powerful tool for elucidating the structural dynamics of these contact sites in living cells through super-resolution imaging.

Technical/Clinical Details

This biosensor system functions by splitting a fluorescent protein, green fluorescent protein (GFP) or yellow fluorescent protein (YFP), into two non-fluorescent fragments. Each fragment is fused to proteins specifically localized to the ER membrane and the Golgi membrane, respectively. When the ER and Golgi come into close contact, the two fragments re-associate to emit fluorescence, making the membrane contact sites visible. This ‘split fluorescent protein’ approach allows for high-resolution tracking of minute membrane contact structures and their dynamic changes at the tens-of-nanometer level. It was successfully demonstrated to effectively capture dynamics during critical cellular events, such as the reorganization of ER-Golgi contacts during cell division, changes during ER stress response, and the disappearance of ER-Golgi contacts during mammalian neuronal development. This opens new avenues for understanding how interactions between intracellular organelles are deeply involved in various physiological and pathological processes.

Background & Context

Membrane contact sites between intracellular organelles are known to play central roles in crucial cellular functions like lipid metabolism, calcium signaling, and autophagy. However, these contact sites are highly transient, dynamic, and exist in minuscule spaces, making real-time observation of their behavior in live cells a long-standing technical challenge. This technology provides a groundbreaking tool to address this significant biological problem and brings a new perspective to cell biology research.

Strategic Significance & Outlook

This split GFP-based fluorescent biosensor holds great potential to contribute significantly to elucidating the mechanisms of diseases involving ER-Golgi interactions, such as neurodegenerative diseases and metabolic disorders. Its ability to visualize membrane contact dynamics in real-time makes it a promising tool for drug screening to evaluate the effects of drug candidates on interactions between intracellular organelles and to identify new therapeutic targets. In the future, this technology is expected to be extended to elucidate contact sites between other intracellular organelles, deepening the comprehensive understanding of cellular functions and contributing to the development of novel intervention strategies for a wider range of diseases.

Source: https://journals.biologists.com/jcs/article/139/13/jcs264795/372070/Split-GFP-based-fluorescent-biosensors-detect-ER

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