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Published 9 July 2001. doi:10.1083/jcb.200101089
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© The Rockefeller University Press, 0021-9525/2001/7/71 $5.00
The Journal of Cell Biology, Volume 154, Number 1, July 9, 2001 71-84


Article

Nuclear pore complexes form immobile networks and have a very low turnover in live mammalian cells

Nathalie Daigle1, Joël Beaudouin1, Lisa Hartnell2, Gabriela Imreh3, Einar Hallberg3, Jennifer Lippincott-Schwartz2 and Jan Ellenberg1

1 European Molecular Biology Laboratory, D-69117 Heidelberg, Germany
2 Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892
3 Södertörns Högskola University, 141 04 Huddinge, Sweden

Address correspondence to Jan Ellenberg, Gene Expression and Cell Biology/Biophysics Programs, European Molecular Biology Laboratory, Meyerhofstrasse 1, D-69117 Heidelberg, Germany. Tel.: (49) 6221-387-328. Fax: (49) 6221-387-518. E-mail: jan.ellenberg{at}embl-heidelberg.de

The nuclear pore complex (NPC) and its relationship to the nuclear envelope (NE) was characterized in living cells using POM121–green fluorescent protein (GFP) and GFP-Nup153, and GFP–lamin B1. No independent movement of single pore complexes was found within the plane of the NE in interphase. Only large arrays of NPCs moved slowly and synchronously during global changes in nuclear shape, strongly suggesting mechanical connections which form an NPC network. The nuclear lamina exhibited identical movements. NPC turnover measured by fluorescence recovery after photobleaching of POM121 was less than once per cell cycle. Nup153 association with NPCs was dynamic and turnover of this nucleoporin was three orders of magnitude faster. Overexpression of both nucleoporins induced the formation of annulate lamellae (AL) in the endoplasmic reticulum (ER). Turnover of AL pore complexes was much higher than in the NE (once every 2.5 min). During mitosis, POM121 and Nup153 were completely dispersed and mobile in the ER (POM121) or cytosol (Nup153) in metaphase, and rapidly redistributed to an immobilized pool around chromatin in late anaphase. Assembly and immobilization of both nucleoporins occurred before detectable recruitment of lamin B1, which is thus unlikely to mediate initiation of NPC assembly at the end of mitosis.

Key Words: nuclear pore complex; nuclear envelope; confocal microscopy; FRAP; live cell imaging


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