Rapid movements of vimentin on microtubule tracks: Kinesin-dependent assembly of intermediate filament networks

Veena Prahlad, Miri Yoon, Robert D. Moir, Ronald D. Vale, Robert D. Goldman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

278 Scopus citations


The assembly and maintenance of an extended intermediate filament (IF) network in fibroblasts requires microtubule (MT) integrity. Using a green fluorescent protein-vimentin construct, and spreading BHK-21 cells as a model system to study IF-MT interactions, we have discovered a novel mechanism involved in the assembly of the vimentin IF cytoskeleton. This entails the rapid, discontinuous, and MT-dependent movement of IF precursors towards the peripheral regions of the cytoplasm where they appear to assemble into short fibrils. These precursors, or vimentin dots, move at speeds averaging 0.55 ± 0.24 μm/s. The vimentin dots colocalize with MT and their motility is inhibited after treatment with nocodazole. Our studies further implicate a conventional kinesin in the movement of the vimentin dots. The dots colocalize with conventional kinesin as shown by indirect immunofluorescence, and IF preparations from spreading cells are enriched in kinesin. Furthermore, microinjection of kinesin antibodies into spreading cells prevents the assembly of an extended IF network. These studies provide insights into the interactions between the IF and MT systems. They also suggest a role for conventional kinesin in the distribution of non-membranous protein cargo, and the local regulation of IF assembly.

Original languageEnglish (US)
Pages (from-to)159-170
Number of pages12
JournalJournal of Cell Biology
Issue number1
StatePublished - Oct 5 1998


  • Cytoskeleton
  • Intermediate filaments
  • Kinesin
  • Microtubule
  • Vimentin

ASJC Scopus subject areas

  • Cell Biology


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