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Tuba stimulates intracellular N-WASP-dependent actin assembly
Eva M Kovacs1, Robert S Makar, Frank B Gertler
1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Journal of Cell Science
|June 8, 2006
Summary
Tuba protein drives melanoma cell ruffling and motility by linking cytoskeletal dynamics and membrane trafficking. Its knockdown impairs invasive behavior, highlighting Tuba
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Tuba is a scaffolding protein connecting cytoskeletal dynamics and membrane trafficking.
- Its N-terminus binds dynamin1, while the C-terminus interacts with signaling and cytoskeletal elements.
Purpose of the Study:
- Investigate Tuba's localization, distribution, and function in B16 melanoma cells.
- Elucidate Tuba's role in dorsal ruffling, actin-driven motility, and cellular invasion.
Main Methods:
- Tuba overexpression and knockdown via RNA interference (RNAi) in B16 melanoma cells.
- Analysis of Tuba localization to lipid vesicles and its interaction with cytoskeletal and signaling proteins.
- Assessment of dorsal ruffles, actin-based motility, and invasive behavior.
Main Results:
- Tuba overexpression stimulated dorsal ruffles independently of dynamin.
- Tuba induced actin-driven motility of puncta, requiring its SH3, GEF, and BAR domains.
- Tuba localized to PIP5Kalpha-generated lipid vesicles and its knockdown reduced melanoma cell invasion.
Conclusions:
- Tuba facilitates melanoma cell dorsal ruffling and motility through interactions with actin regulators and signaling molecules.
- Tuba is crucial for coordinating cytoskeletal rearrangements and implicated in melanoma cell invasion.
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