How Tubulin Dimers Form Oligomers Before Microtubule Assembly
Author Information
Author(s): Julien Mozziconacci, Linda Sandblad, Malte Wachsmuth, Damian Brunner, Eric Karsenti
Primary Institution: Pierre et Marie Curie University, UMR 7600 LPTMC, Paris, France
Hypothesis
Do tubulin dimers oligomerize before being incorporated into microtubules?
Conclusion
The study concludes that microtubule elongation and nucleation involve interactions of short tubulin oligomers rather than single dimers.
Supporting Evidence
- Short tubulin protofilaments form prior to microtubule assembly.
- Electron microscopy showed that tubulin oligomers appeared before microtubules.
- Fluorescence correlation spectroscopy indicated that most tubulin dimers are in an oligomeric state.
Takeaway
Tubulin proteins stick together in small groups before they form larger structures called microtubules, which are important for cell function.
Methodology
The study used electron microscopy and fluorescence correlation spectroscopy to analyze tubulin oligomerization.
Limitations
The study could not measure the longitudinal interaction energy for GTP-bound tubulin due to nucleotide hydrolysis affecting the system.
Digital Object Identifier (DOI)
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