Adaptor-mediated recruitment of RNA polymerase II to a signal-dependent activator - PubMed (original) (raw)
. 1996 Feb 2;271(5):2373-5.
doi: 10.1074/jbc.271.5.2373.
Affiliations
- PMID: 8576192
- DOI: 10.1074/jbc.271.5.2373
Free article
Adaptor-mediated recruitment of RNA polymerase II to a signal-dependent activator
B L Kee et al. J Biol Chem. 1996.
Free article
Abstract
The second messenger cAMP stimulates the expression of a number of target genes via the protein kinase A-mediated phosphorylation of CREB at Ser-133 (Gonzalez, G. A., and Montminy, M. R. (1989) Cell 59, 675-680). Ser-133 phosphorylation enhances CREB activity by promoting interaction with a 265-kDa CREB binding protein referred to as CBP (Arias, J., Alberts, A., Brindle, P., Claret, F., Smeal, T., Karin, M., Feramisco, J., and Montminy, M. (1994) Nature 370, 226-228; Chrivia, J. C., Kwok, R. P., Lamb, N., Hagiwara, M., Montminy, M. R., and Goodman, R. H. (1993) Nature 365, 855-859). The mechanism by which CBP in turn mediates induction of cAMP-responsive genes is unknown but is thought to involve recruitment of basal transcription factors to the promoter. Here we demonstrate that CBP associates specifically with RNA polymerase II in HeLa nuclear extracts. This association in turn permits RNA polymerase II to be recruited to CREB in a phospho-(Ser-133)-dependent manner. As anti-CBP antiserum, which inhibits recruitment of CBP and RNA polymerase II to phospho-(Ser-133) CREB, attenuates transcriptional induction by protein kinase A in vitro, our results demonstrate that the CBP-RNA polymerase II complex is critical for expression of cAMP-responsive genes.
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