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Molecular and Cellular Biology, November 1998, p. 6719-6728, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Inactivation of DNA-Dependent Protein Kinase by Protein Kinase Cdelta : Implications for Apoptosis

Ajit Bharti,1 Stine-Kathrein Kraeft,2 Mrinal Gounder,1 Pramod Pandey,1 Shengfang Jin,3 Zhi-Min Yuan,1 Susan P. Lees-Miller,4 Ralph Weichselbaum,5 David Weaver,3 Lan Bo Chen,2 Donald Kufe,1 and Surender Kharbanda1,*

Cancer Pharmacology1 and Cancer Biology,2 Dana-Farber Cancer Institute, and Department of Microbiology and Molecular Genetics,3 Harvard Medical School, Boston, Massachusetts 02115; Department of Biological Sciences University of Calgary, Calgary, Alberta, Canada T2N IN44; and Department of Radiation and Cellular Oncology University of Chicago, Chicago, Illinois 606375

Received 6 April 1998/Returned for modification 2 June 1998/Accepted 28 July 1998

Protein kinase Cdelta (PKCdelta ) is proteolytically cleaved and activated at the onset of apoptosis induced by DNA-damaging agents, tumor necrosis factor, and anti-Fas antibody. A role for PKCdelta in apoptosis is supported by the finding that overexpression of the catalytic fragment of PKCdelta (PKCdelta CF) in cells is associated with the appearance of certain characteristics of apoptosis. However, the functional relationship between PKCdelta cleavage and induction of apoptosis is unknown. The present studies demonstrate that PKCdelta associates constitutively with the DNA-dependent protein kinase catalytic subunit (DNA-PKcs). The results show that PKCdelta CF phosphorylates DNA-PKcs in vitro. Interaction of DNA-PKcs with PKCdelta CF inhibits the function of DNA-PKcs to form complexes with DNA and to phosphorylate its downstream target, p53. The results also demonstrate that cells deficient in DNA-PK are resistant to apoptosis induced by overexpressing PKCdelta CF. These findings support the hypothesis that functional interactions between PKCdelta and DNA-PK contribute to DNA damage-induced apoptosis.


* Corresponding author. Mailing address: Cancer Pharmacology, Dana-Farber Cancer Institute, Harvard Medical School, 44 Binney St., Boston, MA 02115. Phone: (617) 632-2938. Fax: (617) 632-2934. E-mail: Surender_Kharbanda{at}MacMailGW.dfci.harvard.edu.


Molecular and Cellular Biology, November 1998, p. 6719-6728, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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