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Published online 11 July 2000. doi:10.1083/jcb.150.1.265
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© The Rockefeller University Press, 0021-9525/2000/7/265/ $5.00
The Journal of Cell Biology, Volume 150, Number 1, July 10, 2000 265-274


Reports

CREB-binding Protein (CBP)/p300 and RNA Polymerase II Colocalize in Transcriptionally Active Domains in the Nucleus

Anna von Mikecza,e, Suisheng Zhangb, Marc Montminyd, Eng M. Tane, and Peter Hemmerichc,e
a Junior Research Group of Molecular Cell Biology, Medizinisches Institut für Umwelthygiene, Heinrich-Heine-Universät Düsseldorf, 40225 Düsseldorf, Germany
b Department of Biochemistry, Institut für Molekulare Biotechnologie, 07745 Jena, Germany
c Department of Molecular Biology, Institut für Molekulare Biotechnologie, 07745 Jena, Germany
d The Salk Institute, La Jolla, California 92037
e Department of Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037

Correspondence to: Peter Hemmerich, Department of Molecular Biology, Institut für Molekulare Biotechnologie, Beutenbergstr. 11, 07745 Jena, Germany. Tel:49-3641-656262 Fax:49-3641-656225 E-mail:phemmer{at}imb-jena.de.

The spatial organization of transcription- associated proteins is an important control mechanism of eukaryotic gene expression. Here we analyzed the nuclear distribution of the transcriptional coactivators CREB-binding protein (CBP)/p300 in situ by confocal laser scanning microscopy, and in vivo complex formation by coimmunoprecipitation. A subpopulation of CBP and p300 is targeted to active sites of transcription and partially colocalizes with hyper- and hypophosphorylated RNA polymerase II (pol II) in discrete regions of variable size throughout the nucleus. However, the coactivators were found in tight association with hypophosphorylated, but not hyperphosphorylated pol II. Transcriptional inhibition induced a relocation of CBP/p300 and pol II into speckles. Moreover, double and triple immunofluorescence analyses revealed the presence of CBP, p300, and pol II in a subset of promyelocytic leukemia (PML) bodies. Our results provide evidence for a dynamic spacial link between coactivators of transcription and the basal transcription machinery in discrete nuclear domains dependent upon the transcriptional activity of the cell. The identification of pol II in CBP/PML-containing nuclear bodies supports the idea that transcription takes place at PML bodies.

Key Words: transcription, coactivators, nuclear body, RNA polymerase II, promyelocytic leukemia


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