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Journal of Virology, November 2002, p. 11491-11504, Vol. 76, No. 22
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.22.11491-11504.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Kaposi's Sarcoma-Associated Herpesvirus Mitochondrial K7 Protein Targets a Cellular Calcium-Modulating Cyclophilin Ligand To Modulate Intracellular Calcium Concentration and Inhibit Apoptosis

Pinghui Feng,1 Junsoo Park,1 Bok-Soo Lee,1 Sun-Hwa Lee,1 Richard J. Bram,2 and Jae U. Jung1*

Department of Microbiology and Molecular Genetics and Tumor Virology Division, New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts 01772,1 Department of Pediatrics and Department of Immunology, Mayo Clinic, Rochester, Minnesota 559052

Received 13 June 2002/ Accepted 5 August 2002

On viral infection, infected cells can become the target of host immune responses or can go through a programmed cell death process, called apoptosis, as a defense mechanism to limit the ability of the virus to replicate. To prevent this, viruses have evolved elaborate mechanisms to subvert the apoptotic process. Here, we report the identification of a novel antiapoptotic K7 protein of Kaposi's sarcoma-associated herpesvirus (KSHV) which expresses during lytic replication. The KSHV K7 gene encodes a small mitochondrial membrane protein, and its expression efficiently inhibits apoptosis induced by a variety of apoptogenic agents. The yeast two-hybrid screen has demonstrated that K7 targets cellular calcium-modulating cyclophilin ligand (CAML), a protein that regulates the intracellular Ca2+ concentration. Similar to CAML, K7 expression significantly enhances the kinetics and amplitudes of the increase in intracellular Ca2+ concentration on apoptotic stimulus. Mutational analysis showed that K7 interaction with CAML is required for its function in the inhibition of apoptosis. This indicates that K7 targets cellular CAML to increase the cytosolic Ca2+ response, which consequently protects cells from mitochondrial damage and apoptosis. This is a novel viral antiapoptosis strategy where the KSHV mitochondrial K7 protein targets a cellular Ca2+-modulating protein to confer resistance to apoptosis, which allows completion of the viral lytic replication and, eventually, maintenance of persistent infection in infected host.

* Corresponding author. Mailing address: Tumor Virology Division, New England Regional Primate Research Center, Harvard Medical School, P.O. Box 9102, 1 Pine Hill Dr., Southborough, MA 01772-9102. Phone: (508) 624-8083. Fax: (508) 786-1416. E-mail: jae_jung{at}hms.harvard.edu.

Journal of Virology, November 2002, p. 11491-11504, Vol. 76, No. 22
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.22.11491-11504.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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