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Blood, 15 May 2005, Vol. 105, No. 10, pp. 3855-3861.
Prepublished online as a Blood First Edition Paper on February 1, 2005; DOI 10.1182/blood-2004-08-3342.
Previous Article | Next Article 
Submitted August 27, 2004
Accepted January 25, 2005
Positive and negative regulation of c-Myb by Cyclin D1, cyclin-dependent kinases and p27 Kip1
Wanli Lei, Fan Liu, and Scott A Ness*
Department of Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
* Corresponding author; email: ness{at}unm.edu.
The c-Myb transcription factor controls differentiation and proliferation in hematopoietic and other cell types and has latent transforming activity, but little is known about its regulation during the cell cycle. Here, c-Myb was identified as part of a protein complex from human T-cells containing the cyclin-dependent kinase (CDK) CDK6. Assays using model reporter constructs as well as endogenous target genes showed that the activity of c-Myb was inhibited by Cyclin D1 plus CDK4 or CDK6, but stimulated by expression of the CDK inhibitors p16 INK4A, p21 Cip1 or p27 Kip1. Mapping experiments identified a highly conserved region in c-Myb which, when transferred to the related A-Myb transcription factor, also rendered it responsive to CDKs and p27. The results suggest that c-Myb activity is directly regulated by cyclin D1 and CDKs and imply that c-Myb activity is regulated during the cell cycle in hematopoietic cells.

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