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Updated: Jul 27, 2026

Single-Molecule Imaging of Nuclear Transport
Published on: June 9, 2010
Nuclear protein migration involves two steps: rapid binding at the nuclear envelope followed by slower translocation
W D Richardson1, A D Mills, S M Dilworth
1Department of Biology, University College London, England.
Abstract:
When injected into the cytoplasm of Vero cells, nucleoplasmin rapidly concentrates in a narrow layer around the nuclear envelope and then accumulates within the nucleus. Transport into the nucleus can be reversibly arrested at the perinuclear stage by metabolic inhibitors or by chilling. Nucleoplasmin-coated colloidal gold particles concentrate around the nuclear envelope of Vero cells or Xenopus oocytes, and by electron microscopy of oocytes appear to be associated with fibrils attached to nuclear pore complexes. Perinuclear accumulation is not observed for the nonmigrating nucleoplasmin core fragment or nonnuclear proteins. We propose two steps in nuclear migration of proteins: rapid binding around the nuclear envelope, possibly to pore-associated fibrils, followed by slower, energy-dependent translocation through nuclear pores.
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