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and Steroid Receptor Coactivator-1
Department of Molecular and Cellular Biology (D.L.S., M.G.M., K.P.,
C.L.S., M.A.M.) Baylor College of Medicine Houston, Texas
77030
Ligand Pharmaceuticals, Inc. (E.A.A.)
San Diego, California 92121
We have *analyzed ligand-dependent, subnuclear
movements of the estrogen receptor-
(ER
) in terms of both spatial
distribution and solubility partitioning. Using a transcriptionally
active green fluorescent protein-ER
chimera (GFP-ER
), we find
that 17ß-estradiol (E2) changes the normally
diffuse nucleoplasmic pattern of GFP-ER
to a hyperspeckled
distribution within 1020 min. A similar reorganization occurs with
the partial antagonist 4-hydroxytamoxifen; only a subtle effect was
observed with the pure antagonist ICI 182,780. To examine the influence
of ligand upon ER
association with nuclear structure, MCF-7 cells
were extracted to reveal the nuclear matrix (NM). Addition of
E2, 4-hydroxytamoxifen, or ICI 182,780
causes ER
to partition with the NM-bound fraction on a similar time
course (1020 min) as the spatial reorganization suggesting that the
two events are related. To determine the effects of
E2 on the redistribution and solubility of
GFP-ER
, individual cells were directly examined during both hormone
addition and NM extraction and showed that GFP-ER
movement and NM
association were coincident. Colocalization experiments were performed
with antibodies to identify sites of transcription (RNA pol IIo) and
splicing domains (SRm160). Using E2 treated
MCF-7 cells, minor overlap was observed with transcription sites and a
small amount of the total ER
pool. Experiments performed with
bioluminescent derivatives of ER
and steroid receptor
coactivator-1 (SRC-1) demonstrated both proteins colocalize to the same
NM-bound foci in response to E2 but not the
antagonists tested. Deletion mutagenesis and in situ
analyses indicate intranuclear colocalization requires a central SRC-1
domain containing LXXLL motifs. Collectively, our data suggest that
ER
transcription function is dependent upon dynamic early events
including intranuclear rearrangement, NM association, and SRC-1
interactions.
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