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Molecular and Cellular Biology, February 2001, p. 1001-1010, Vol. 21, No. 4
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.4.1001-1010.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Recruitment of an RNA Polymerase II Complex Is Mediated by the Constitutive Activation Domain in CREB, Independently of CREB Phosphorylation

Edward A. Felinski, Jeonga Kim, Jingfang Lu, and Patrick G. Quinn*

Department of Cellular and Molecular Physiology, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033

Received 8 September 2000/Returned for modification 16 October 2000/Accepted 14 November 2000

The cAMP response element binding protein (CREB) is a bifunctional transcription activator, exerting its effects through a constitutive activation domain (CAD) and a distinct kinase inducible domain (KID), which requires phosphorylation of Ser-133 for activity. Both CAD and phospho-KID have been proposed to recruit polymerase complexes, but this has not been directly tested. Here, we show that the entire CREB activation domain or the CAD enhanced recruitment of a complex containing TFIID, TFIIB, and RNA polymerase II to a linked promoter. The nuclear extracts used mediated protein kinase A (PKA)-inducible transcription, but phosphorylation of CRG (both of the CREB activation domains fused to the Gal4 DNA binding domain) or KID-G4 did not mediate recruitment of a complex, and mutation of the PKA site in CRG abolished transcription induction by PKA but had no effect upon recruitment. The CREB-binding protein (CBP) was not detected in the recruited complex. Our results support a model for transcription activation in which the interaction between the CREB CAD and hTAFII130 of TFIID promotes the recruitment of a polymerase complex to the promoter.

* Corresponding author. Mailing address: Department of Cellular and Molecular Physiology, H166, The Pennsylvania State University College of Medicine, 500 University Dr., Hershey, PA 17033. Phone: (717) 531-6182. Fax: (717) 531-7667. E-mail: pquinn{at}psu.edu.

Molecular and Cellular Biology, February 2001, p. 1001-1010, Vol. 21, No. 4
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.4.1001-1010.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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