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Human herpesvirus 8 (HHV-8)-encoded viral interleukin-6 (vIL-6) was the first viral IL-6 homologue to be identified. Experimental and clinical evidence suggests that vIL-6 is important for the onset and/or progression of HHV-8-associated endothelial-cell and B-cell pathologies, including AIDS-associated Kaposi’s sarcoma and multicentric Castleman’s disease. The protein is unusual in its poor secretion from cells and its intracellular activity; it interacts, directly or indirectly, with a number of proteins beyond the IL-6 signal transducer, gp130, and can mediate activities through these interactions in the endoplasmic reticulum. Here, we report the characterization with respect to protein interactions and signal-transducing activity of a panel of vIL-6 variants and utilization of HHV-8 mutant viruses expressing selected variants in phenotypic analyses. Our findings establish the importance of vIL-6 in HHV-8 productive replication and the contributions of individual vIL-6-protein interactions to HHV-8 lytic biology. This work furthers understanding of the biological significance of vIL-6 and its unique intracellular interactions.

Genetic Analyses of Contributions of Viral Interleukin-6 Interactions and Signaling to Human Herpesvirus 8 Productive Replication