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Molecular and Cellular Biology, February 2003, p. 1004-1013, Vol. 23, No. 3
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.3.1004-1013.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Transcriptional Coactivation of Bone-Specific Transcription Factor Cbfa1 by TAZ

Cai Bin Cui,1 Lyndon F. Cooper,2 Xiangli Yang,3 Gerard Karsenty,3 and Ikramuddin Aukhil1*

Department of Periodontology,1 Department of Prosthodontics, University of North Carolina, Chapel Hill, North Carolina 27599,2 Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 770303

Received 16 May 2002/ Returned for modification 26 June 2002/ Accepted 12 November 2002

Core-binding factor 1 (Cbfa1; also called Runx2) is a transcription factor belonging to the Runt family of transcription factors that binds to an osteoblast-specific cis-acting element (OSE2) activating the expression of osteocalcin, an osteoblast-specific gene. Using the yeast two-hybrid system, we identified a transcriptional coactivator, TAZ (transcriptional coactivator with PDZ-binding motif), that binds to Cbfa1. A functional relationship between Cbfa1 and TAZ is demonstrated by the coimmunoprecipitation of TAZ by Cbfa1 and by the fact that TAZ induces a dose-dependent increase in the activity of osteocalcin promoter-luciferase constructs by Cbfa1. A dominant-negative construct of TAZ in which the coactivation domains have been deleted reduces osteocalcin gene expression down to basal levels. NIH 3T3, MC 3T3, and ROS 17/2.8 cells showed the expected nuclear localization of Cbfa1, whereas TAZ was distributed throughout the cytoplasm with some nuclear localization when transfected with either Cbfa1 or TAZ. Upon cotransfection by both Cbfa1 and TAZ, the transfected TAZ shows predominant nuclear localization. The dominant-negative construct of TAZ shows minimal nuclear localization upon cotransfection with Cbfa1. These data indicate that TAZ is a transcription coactivator for Cbfa1 and may be involved in the regulation of osteoblast differentiation.

* Corresponding author. Mailing address: Department of Periodontology, CB #7450, University of North Carolina, Chapel Hill, NC 27599-7450. Phone: (919) 966-4392. Fax: (919) 966-0284. E-mail: ikramuddin_aukhil{at}dentistry.unc.edu.

Molecular and Cellular Biology, February 2003, p. 1004-1013, Vol. 23, No. 3
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.3.1004-1013.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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