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Purification and Application of a Small Actin Probe for Single-Molecule Localization Microscopy
Roderick P Tas1, Trusanne G A A Bos2, Lukas C Kapitein3
1Cell Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands.
Methods in Molecular Biology (Clifton, N.J.)
|September 24, 2017
Summary
This study details a protocol for preparing and using the lifeAct peptide for super-resolution microscopy. This method enables detailed imaging of actin structures and can be adapted for other protein fragments.
Area of Science:
- Cell Biology
- Biophysics
- Microscopy
Background:
- The cytoskeleton, including actin filaments, is crucial for cellular functions.
- Super-resolution microscopy techniques like Single-Molecule Localization Microscopy (SMLM) offer high-resolution imaging of cytoskeletal structures.
- Traditional SMLM methods often rely on photoswitchable fluorophores, limiting multicolor imaging capabilities.
Purpose of the Study:
- To provide a detailed protocol for the purification, labeling, and application of the lifeAct peptide for SMLM.
- To enable advanced imaging of polymerized actin structures with improved multicolor capabilities.
- To present a versatile strategy adaptable for other protein fragments in SMLM.
Main Methods:
- Purification of the lifeAct polypeptide fragment.
- Labeling of lifeAct with fluorescent probes.
- Utilizing labeled lifeAct for Single-Molecule Localization Microscopy (SMLM) of actin filaments.
- Employing Point-Spread-Function analysis for high-resolution imaging.
Main Results:
- A robust step-by-step protocol for preparing and using lifeAct for SMLM is established.
- The method allows for detailed visualization of actin cytoskeleton dynamics.
- The developed strategy overcomes limitations associated with fluorophore blinking, enabling simpler multicolor imaging.
Conclusions:
- The protocol provides a reliable method for lifeAct-based SMLM of actin.
- This approach enhances the capabilities of super-resolution microscopy for studying cytoskeletal organization.
- The purification and labeling strategy is potentially extensible to other protein fragments for SMLM applications.
