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J. Virol., 03 1997, 1984-1991, Vol 71, No. 3
M Li, H Lee, DW Yoon, JC Albrecht, B Fleckenstein, F Neipel and JU Jung
Kaposi's sarcoma-associated herpesvirus (KSHV) (also called human
herpesvirus 8) is consistently found in Kaposi's sarcoma lesions and in
body-cavity-based lymphomas. A 17-kb KSHV lambda clone was obtained
directly from a Kaposi's sarcoma lesion. DNA sequence analysis of this
clone identified an open reading frame which has 32% amino acid identity
and 53% similarity to the virus-encoded cyclin (v-cyclin) of herpesvirus
saimiri (HVS) and 31% identity and 53% similarity to human cellular cyclin
D2. This KSHV open reading frame was shown to encode a 29- to 30-kDa
protein with the properties of a v-cyclin. KSHV v-cyclin protein was found
to associate predominantly with cdk6, a cellular cyclin-dependent kinase
known to interact with cellular type D cyclins and HVS v-cyclin. The KSHV
v-cyclin was also found to associate weakly with cdk4. KSHV v-cyclin-cdk6
complexes strongly phosphorylated glutathione S-transferase-Rb fusion
protein and histone H1 as substrates in vitro. Thus, KSHV v-cyclin
resembles the v-cyclin of the T-lymphocyte-transforming HVS in its
specificity for association with cdk6 and in its ability to strongly
activate cdk6 protein kinase activity.
Copyright © 1997, American Society for Microbiology
Kaposi's sarcoma-associated herpesvirus encodes a functional cyclin
New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts 01772, USA.
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