Either NLS1APC or NLS2APC is sufficient to
translocate the cytoplasmic protein βGal into the nucleus.
βGal-fusion proteins were expressed in mouse L cells and detected by
immunofluorescence microscopy. Nuclei were visualized with
4′,6-diamidino-2-phenylindole (DAPI). Areas of overlap between the
βGal fusion protein (green) and the nuclei (blue) appear an aqua
color. (Bar = 10 μm.) For each construct, 100 cells were scored
for βGal localization with conventional fluorescence microscopy. The
results of four independent experiments are presented as the incidence
of nuclear βGal staining ± SD as follows: βGal, 27(±6)%;
βGal-NLSSV40 T-ag, 100(±0)%;
βGal-NLS1APC, 73(±11)%; βGal-mNLS1APC,
30(±13)%; βGal-NLS2APC, 69(±8)%;
βGal-mNLS2APC, 35(±4)%; βGal-NLS1,2APC,
83(±6)%; and βGal-(NLS2APC)2, 91(±4)%.