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Molecular and Cellular Biology, January 2001, p. 260-270, Vol. 21, No. 1
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.1.260-270.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

MAT1-Modulated CAK Activity Regulates Cell Cycle G1 Exit

Lingtao Wu,1,2,* Ping Chen,3 Chung H. Shum,1,2 Cheng Chen,1 Lora W. Barsky,4 Kenneth I. Weinberg,2,4 Ambrose Jong,2,3 and Timothy J. Triche1,2

Department of Pathology,1 Division of Hematology-Oncology,3 and Division of Research Immunology/BMT,4 Childrens Hospital Los Angeles Research Institute, Los Angeles, California 90027, and University of Southern California Keck School of Medicine, Los Angeles, California 900332

Received 10 May 2000/Returned for modification 13 July 2000/Accepted 4 October 2000

The cyclin-dependent kinase (CDK)-activating kinase (CAK) is involved in cell cycle control, transcription, and DNA repair (E. A. Nigg, Curr. Opin. Cell. Biol. 8:312-317, 1996). However, the mechanisms of how CAK is integrated into these signaling pathways remain unknown. We previously demonstrated that abrogation of MAT1 (ménage à trois 1), an assembly factor and targeting subunit of CAK, induces G1 arrest (L. Wu, P. Chen, J. J. Hwang, L. W. Barsky, K. I. Weinberg, A. Jong, and V. A. Starnes, J. Biol. Chem. 274:5564-5572, 1999). This result led us to investigate how deregulation of CAK by MAT1 abrogation affects the cell cycle G1 exit, a process that is regulated most closely by phosphorylation of retinoblastoma tumor suppressor protein (pRb). Using mammalian cellular models that undergo G1 arrest evoked by antisense MAT1 abrogation, we found that deregulation of CAK inhibits pRb phosphorylation and cyclin E expression, CAK phosphorylation of pRb is MAT1 dose dependent but cyclin D1/CDK4 independent, and MAT1 interacts with pRb. These results suggest that CAK is involved in the regulation of cell cycle G1 exit while MAT1-modulated CAK formation and CAK phosphorylation of pRb may determine the cell cycle specificity of CAK in G1 progression.

* Corresponding author. Mailing address: Department of Pathology, Childrens Hospital Los Angeles Research Institute/University of Southern California Keck School of Medicine, Smith Research Tower, MS#103, 4650 Sunset Blvd., Los Angeles, CA 90027. Phone: (323) 660-2450, ext. 6318. Fax: (323) 671-3669. E-mail: lingtaow{at}hsc.usc.edu.

Molecular and Cellular Biology, January 2001, p. 260-270, Vol. 21, No. 1
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.1.260-270.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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