Murine cytomegalovirus (CMV) M33 and human CMV US28 receptors exhibit similar constitutive signaling activities

Waldhoer, Maria, Kledal, Thomas N, Farrell, Helen and Schwartz, Thue W (2002) Murine cytomegalovirus (CMV) M33 and human CMV US28 receptors exhibit similar constitutive signaling activities. Journal of Virology, 76 16: 8161-8168. doi:10.1128/JVI.76.16.8161-8168.2002

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Author Waldhoer, Maria
Kledal, Thomas N
Farrell, Helen
Schwartz, Thue W
Title Murine cytomegalovirus (CMV) M33 and human CMV US28 receptors exhibit similar constitutive signaling activities
Journal name Journal of Virology   Check publisher's open access policy
ISSN 0022-538X
1098-5514
Publication date 2002-08-01
Year available 2002
Sub-type Article (original research)
DOI 10.1128/JVI.76.16.8161-8168.2002
Open Access Status File (Publisher version)
Volume 76
Issue 16
Start page 8161
End page 8168
Total pages 8
Place of publication Washington, DC, United States
Publisher American Society for Microbiology
Language eng
Abstract Cellular infection by cytomegalovirus (CMV) is associated with very early G-protein-mediated signal transduction and reprogramming of gene expression. Here we investigated the involvement of human CMV (HCMV)-encoded US27, US28, and UL33 receptors as well as murine CMV-encoded M33 transmembrane (7TM) receptors in host cell signaling mechanisms. HCMV-encoded US27 did not show any constitutive activity in any of the studied signaling pathways; in contrast, US28 and M33 displayed ligand-independent, constitutive signaling through the G protein q (Gq)/phospholipase C pathway. In addition, M33 and US28 also activated the transcription factor NF-{kappa}B as well as the cyclic AMP response element binding protein (CREB) in a ligand-independent, constitutive manner. The use of specific inhibitors indicated that the p38 mitogen-activated protein (MAP) kinase but not the extracellular signal-regulated kinase 1/2-MAP kinase pathway is involved in M33- and US28-mediated CREB activation but not NF-{kappa}B activation. Interestingly, UL33—the HCMV-encoded structural homologue of M33—was only marginally constitutively active in the Gq/phospholipase C turnover and CREB activation assays and did not show any constitutive activity in the NF-{kappa}B pathway, where M33 and US28 were highly active. Hence, CMVs appear to have conserved mechanisms for regulating host gene transcription, i.e., constitutive activation of certain kinases and transcription factors through the constitutive activities of 7TM proteins. These data, together with the previous identification of the incorporation of such proteins in the viral envelope, suggest that these proteins could be involved in the very early reprogramming of the host cell during viral infection.
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Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Clinical Medical Virology Centre Publications
 
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