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Updated: Jul 7, 2026

Single-Molecule Imaging of Nuclear Transport
Published on: June 9, 2010
Nuclear import in digitonin-permeabilized cells
1Baylor College of Medicine, Houston, Texas, USA.
Abstract:
Import of proteins into the nucleus of a cell is a complex process that can be reconstituted in vitro. Digitonin-permeabilized cells are washed free of cytosolic factors to provide competent nuclei. Cytosolic factors for import are provided by an extract of Xenopus ovarian cells. Fluorochrome-conjugated probes, cloned proteins fused to green fluorescent protein, or antibodies to the protein of interest are used to visualize nuclear import. The system can also be used to identify nuclear localization sequences (NLS) of imported proteins.
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