Abstract:
:Active nucleo-cytoplasmic transport is mediated by dynamic signal-mediated pathways. We investigated the effects of transcription inhibitors or fluorescent lectins on nuclear import mediated by nuclear localization signals (NLSs). Therefore, a novel experimental approach that allows the controlled sequential introduction of fluorescent substances into living cells was established. A microinjection system equipped with an UV-source enabled us to identify fluorescent-labeled cells for the subsequent introduction of additional fluorescent compounds, in order to study their interactions in vivo. Cells were initially labeled either by expression of autofluorescent proteins or by microinjection of fluorescent substances. Transcription inhibitors did not affect nuclear transport mediated by classical NLSs but inhibited import mediated by the M9-domain of hnRNPA1. Comparison of a mono- and bipartite NLS revealed that the bipartite signal was more active in import. Sequential injection of differentially labeled nuclear import and export substrates allowed monitoring of import and export simultaneously in the same living cell. The introduced experimental approach will also be useful to analyze a variety of biological processes in living mammalian cells.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Stauber RH,Krätzer F,Schneider G,Hirschmann N,Hauber J,Rosorius Odoi
10.1002/1097-4644(20010301)80:3<388::aid-jcb130>3.subject
Has Abstractpub_date
2001-01-01 00:00:00pages
388-96issue
3eissn
0730-2312issn
1097-4644pii
10.1002/1097-4644(20010301)80:3<388::AID-JCB130>3.journal_volume
80pub_type
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