T. Haraguchi et al., Live fluorescence imaging reveals early recruitment of emerin, LBR, RanBP2, and Nup153 to reforming functional nuclear envelopes, J CELL SCI, 113(5), 2000, pp. 779-794
We determined the times when the nuclear membrane, nuclear pore complex (NP
C) components, and nuclear import function were recovered during telophase
in living HeLa cells, Simultaneous observation of fluorescently-labeled NLS
-bearing proteins, lamin B receptor (LBR)-GFP, and Hoechst33342-stained chr
omosomes revealed that nuclear membranes reassembled around chromosomes by
5 minutes after the onset of anaphase (early telophase) whereas nuclear imp
ort function was recovered later, at 8 minutes. GFP-tagged emerin also accu
mulated on chromosomes 5 minutes after the onset of anaphase. Interestingly
, emerin and LBR initially accumulated at distinct, separate locations, but
then became uniform 8 minutes after the onset of anaphase, concurrent with
the recovery of nuclear import function. We further determined the timing
of NPC assembly by immunofluorescence staining of cells fixed at precise ti
mes after the onset of anaphase. Taken together, these results showed that
emerin, LBR, and several NPC components (RanBP2, Nup153, p62), but not Tpr,
reconstitute around chromosomes very early in telophase prior to the recov
ery of nuclear import activity.