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Actin reorganization through dynamic interactions with single-wall carbon nanotubes
Hengameh Shams1, Brian D Holt, Seyed Hanif Mahboobi
1Molecular Cell Biomechanics Laboratory, Departments of Bioengineering and Mechanical Engineering, University of California , Berkeley, California 94720, United States.
ACS Nano
|December 20, 2013
Summary
Single-wall carbon nanotubes (SWCNTs) interact with actin via hydrophobic forces, causing nanoscale changes. These molecular-level alterations explain how SWCNTs reorganize actin filaments in cells.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Cell Biology
Background:
- Single-wall carbon nanotubes (SWCNTs) are increasingly used in biological applications.
- SWCNTs influence cellular phenotypes like proliferation and growth.
- SWCNTs affect the actin cytoskeleton, but molecular interactions are unknown.
Purpose of the Study:
- Investigate the molecular-level interaction between SWCNTs and actin.
- Understand how SWCNTs affect actin structure at the nanoscale.
Main Methods:
- All-atom molecular dynamics simulations.
- Near-infrared (NIR) spectroscopy of actin-dispersed SWCNTs.
Main Results:
- Actin stably binds to SWCNT surfaces through hydrophobic interactions.
- SWCNTs can slide and rotate on the actin surface.
- Nanoscale conformational changes occur in actin-SWCNT complexes.
Conclusions:
- The study elucidates the molecular mechanism of SWCNT-actin interaction.
- Observed nanoscale changes in actin structure likely drive larger-scale actin reorganization.
- Findings provide insights into SWCNT effects on cell behavior.
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