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Updated: Sep 9, 2025
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Spatiotemporal Subcellular Manipulation of the Microtubule Cytoskeleton in the Living Preimplantation Mouse Embryo using Photostatins
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Tau-Derived Peptides Bearing Azobenzene on Side Chains for Light-Controllable Microtubule Polymerization
Hiroshi Inaba1,2,3, Misato Umayahara1, Akira Kakugo4
1Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, Tottori, Japan.
Cytoskeleton (Hoboken, N.J.)
|September 1, 2025
Summary
Researchers created photoresponsive Tau-derived peptides to control microtubule polymerization optically. These peptides bind inside microtubules, enabling light-induced changes in microtubule length for precise cellular process regulation.
Area of Science:
- Biochemistry
- Cell Biology
- Biotechnology
Background:
- Microtubule dynamics are crucial for cellular functions.
- Optical regulation of microtubules offers precise control.
- Photoresponsive molecules are key for light-activated cellular manipulation.
Purpose of the Study:
- To develop Tau-derived peptides for light-controlled microtubule polymerization.
- To investigate the targeting and function of azobenzene-modified peptides within microtubules.
- To establish a platform for spatiotemporal optical regulation of microtubule dynamics.
Main Methods:
- Synthesis of azobenzene-functionalized Tau-derived peptides using solid-phase chemistry.
- Confocal microscopy and competition assays to confirm microtubule binding.
- Photoisomerization studies to assess light-dependent effects on microtubule polymerization.
Main Results:
- Two peptide derivatives successfully targeted the Taxol-binding pocket inside microtubules.
- The cis-form of one derivative (cis-TMR-Azo-TP2) significantly enhanced microtubule polymerization.
- Light-dependent switching of microtubule length was achieved via photoisomerization.
Conclusions:
- Azobenzene-functionalized Tau-derived peptides provide reversible photocontrol of microtubule polymerization.
- These peptides offer a versatile platform for spatiotemporal optical regulation of microtubule dynamics.
- The findings open new avenues for optical tools in cell biology and drug development.
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