BioTech IP Review

• Journal: Nature Biotechnology
• Publication Date: 11 December 2023 (online) 
• DOI: 10.1038/s41587-023-02018-w 
• Type: Research article / brief communication 

What the paper reports

This study describes the development of mStayGold, a monomeric version of the highly bright and photostable fluorescent protein StayGold. StayGold itself is an exceptionally bright green fluorescent protein with very strong resistance to photobleaching — valuable for imaging in live cells and tissues — but its original form tended to form dimers, which can interfere with many biological tagging and imaging applications. The authors determined the X-ray crystal structure of StayGold at 1.6 Å resolution and engineered a derivative, mStayGold, that retains the original protein’s high brightness and photostability while existing as a single monomeric unit instead of a dimer. This makes it far more versatile and useful as a genetically encoded tag in biological research, especially for imaging at high resolution or in sensitive live-cell contexts where dimerization can cause artifacts.

Why this work is Important

• Enabling broader use of a high-performance fluorescent tag: Fluorescent proteins are foundational tools in biotechnology for visualizing gene expression, subcellular structures, protein localization, and dynamic biological processes; improving their photostability and monomeric behavior dramatically expands their utility.
• Structural insight: Solving the crystal structure helps rational protein engineering and informs future design of even better fluorescent probes.
• Impact across disciplines: Monomeric photostable fluorescent proteins like mStayGold are widely used in cell biology, neuroscience, developmental biology, and biotechnology tool development, making this advance broadly relevant across the life sciences.

In summary, this article exemplified a practical biotechnology advance published in Nature Biotechnology, improving tools that researchers worldwide use for high-resolution, long-duration imaging of living cells and biological systems.