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Labeling Strategies Matter for Super-Resolution Microscopy: A Comparison between HaloTags and SNAP-tags
Roman S Erdmann1, Stephanie Wood Baguley2, Jennifer H Richens3
1Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, USA; Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT, USA.
Cell Chemical Biology
|February 13, 2019
Summary
For super-resolution microscopy in live cells, HaloTags show up to 9-fold brighter signals than SNAP-tags when using specific organic fluorophores. This highlights the importance of choosing the right protein tag for optimal imaging duration and resolution.
Area of Science:
- Cellular and Molecular Imaging
- Biotechnology
- Microscopy Techniques
Background:
- Super-resolution microscopy demands bright, photostable fluorophores for live-cell imaging.
- Organic fluorophores offer superior photon emission compared to fluorescent proteins.
- Self-labeling protein tags like HaloTags and SNAP-tags enable molecular specificity with organic fluorophores in live cells.
Purpose of the Study:
- To compare the performance of HaloTags and SNAP-tags for live-cell imaging.
- To evaluate labeling strategies for stimulated emission depletion (STED) microscopy.
- To determine the impact of labeling systems on fluorescent signal intensity and imaging duration.
Main Methods:
- Confocal and STED microscopy were employed for comparative analysis.
- Various proteins were expressed and labeled using HaloTag and SNAP-tag systems.
- Far-red rhodamine derivatives were utilized as organic fluorophores.
- Two distinct model systems were used for validation.
Main Results:
- Fluorescent signal intensity was significantly higher with HaloTags compared to SNAP-tags.
- Up to a 9-fold increase in signal was observed with HaloTags using far-red rhodamine derivatives.
- The choice of labeling strategy directly influenced imaging outcomes.
Conclusions:
- HaloTags provide superior fluorescent signal in live-cell STED microscopy compared to SNAP-tags, particularly with specific organic dyes.
- Labeling strategy is a critical factor determining the feasibility and duration of super-resolution live-cell imaging.
- This finding has implications for optimizing advanced microscopy techniques.
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