Related Experiment Video
Updated: Feb 7, 2026
08:44
Assembly and Characterization of Polyelectrolyte Complex Micelles
Published on: March 2, 2020
11.6K
Structural characterization of a minimal KLC2/Nup358/BicD2 complex.
Biorxiv : the Preprint Server for Biology
|February 6, 2026
Summary
Cellular transport relies on multi-motor protein complexes. This study reveals how Kinesin-1 light chain 2 (KLC2) and Bicaudal D2 (BicD2) cooperatively bind Nup358, influencing motor recruitment for nuclear positioning.
Area of Science:
- Cellular biology
- Molecular motors
- Protein structure and dynamics
Background:
- Cellular transport along microtubules involves multi-motor protein complexes.
- Nuclear pore protein Nup358 interacts with Bicaudal D2 (BicD2) to recruit dynein and kinesin-1 motors for nuclear positioning.
- Regulation of motor recruitment by BicD2-Nup358 interactions is not fully understood.
Purpose of the Study:
- To characterize the structure of a minimal complex of kinesin-1 light chain 2 (KLC2), Nup358, and BicD2.
- To elucidate the mechanism of motor recruitment regulation by BicD2 and Nup358.
Main Methods:
- Cryo-electron microscopy (cryo-EM) to determine complex structure.
- Small-angle X-ray scattering (SAXS) to analyze complex shape and stoichiometry.
- Biochemical assays to study protein interactions and oligomerization.
Main Results:
- KLC2/Nup358 forms a rod-like structure that thickens upon BicD2 binding.
- BicD2 binding shifts the KLC2/Nup358/BicD2 complex towards a 2:2:2 stoichiometry, promoting dimerization.
- Nup358/KLC2 interaction also favors a 2:2:2 stoichiometry.
Conclusions:
- KLC2 and BicD2 are cooperatively recruited to Nup358.
- Cooperative binding is potentially mediated by modulation of the complex's oligomeric state.
- Understanding this mechanism provides insights into nuclear positioning and brain development pathways.
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