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Molecular and Cellular Biology, October 2000, p. 7624-7633, Vol. 20, No. 20
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Loss of p19ARF Eliminates the Requirement for the pRB-Binding Motif in Simian Virus 40 Large T Antigen-Mediated Transformation

Herta H. A. Chao, Ann M. Buchmann, and James A. DeCaprio*

Dana-Farber Cancer Institute and Harvard Medical School, Boston, Massachusetts 02115

Received 11 May 2000/Returned for modification 8 June 2000/Accepted 26 July 2000

At least three domains of simian virus 40 large T antigen (TAg) participate in cellular transformation. The LXCXE motif of TAg binds to all members of the retinoblastoma protein (pRB) family of tumor suppressors. The N-terminal 70 residues of TAg have significant homology to the J domain of Hsp40/DnaJ and cooperate with the LXCXE motif to inactivate the pRB family. A bipartite C-terminal domain of TAg binds to p53 and thereby disrupts the ability of p53 to act as a sequence-specific transcription factor. The contribution of these three domains of TAg to cellular transformation was evaluated in cells that contained inactivating mutations in the pRB and p53 pathways. Cells that stably expressed wild-type or selected mutant forms of TAg were generated in mouse embryo fibroblasts (MEFs) containing homozygous deletions in the RB, INK4a, and ARF loci. It was determined that the J domain, the LXCXE motif, and the p53-binding domain of TAg were required for full transformation of wild-type and RB-/- MEFs. In contrast, INK4a-/- MEFs that lacked expression of p16INK4a and p19ARF and ARF-/- MEFs that lacked p19ARF but expressed p16INK4a acquired anchorage-independent growth when expressing wild-type TAg or mutant derivatives that disrupted either the pRB-binding or p53-binding domain. The expression and function of the pRB family members were not overly disrupted in ARF-/- MEFs expressing LXCXE mutants of TAg. These results suggest that inactivating mutations of p19ARF can relieve the requirement for the LXCXE motif in TAg-mediated transformation and that TAg may have additional functions in transformation.

* Corresponding author. Mailing address: Dana-Farber Cancer Institute, Mayer 457, 44 Binney St., Boston, MA 02115. Phone: (617) 632-3825. Fax: (617) 632-4760. E-mail: james_decaprio{at}dfci.harvard.edu.

Molecular and Cellular Biology, October 2000, p. 7624-7633, Vol. 20, No. 20
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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