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Journal of Virology, October 1998, p. 8158-8165, Vol. 72, No. 10
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Functional Analysis of the Human Cytomegalovirus US28 Gene by Insertion Mutagenesis with the Green Fluorescent Protein Gene

Jeffrey Vieira,1,2,* Thomas J. Schall,3 Lawrence Corey,1,2 and Adam P. Geballe4

Department of Laboratory Medicine, University of Washington, Seattle, Washington 981951; Program in Infectious Diseases, Fred Hutchinson Cancer Research Center, Seattle, Washington 981042; ChemoCentryx, Mountain View, California 940433; and Divisions of Molecular Medicine and Clinical Research, Fred Hutchinson Cancer Research Center, Seattle, Washington 981094

Received 16 January 1998/Accepted 10 July 1998

The protein encoded by the US28 gene of human cytomegalovirus (HCMV) has homology to G protein-coupled receptors (GCR). Previous studies demonstrated that recombinant US28 protein can bind the beta  class of chemokines (K. Neote, D. DiGregorio, J. Y. Mak, R. Horuk, and T. J. Schall, Cell 72:415-425, 1993) and induce a rise in intracellular calcium after the binding of chemokines (J. L. Gao and P. M. Murphy, J. Biol. Chem. 269:28539-28542, 1994). In order to investigate the function of the US28 protein in virus-infected cells, a recombinant HCMV (HV5.8) was constructed, with the US28 open reading frame disrupted by the insertion of the Escherichia coli gpt gene and the gene for the green fluorescent protein. The US28 gene is not required for growth in human fibroblasts (HF). HF infected with wild-type HCMV bound RANTES at 24 h postinfection and demonstrated an intracellular calcium flux induced by RANTES. In cells infected with HV5.8, RANTES did not bind or induce a calcium flux, demonstrating that US28 is responsible for the beta -chemokine binding and induced calcium signaling in HCMV-infected cells. The ability of the US28 gene to bind chemokines was shown to cause a significant reduction in the concentration of RANTES in the medium of infected cells. Northern analysis of RNA from infected cells showed that US28 is an early gene, while US27 (another GCR) is a late gene.

* Corresponding author. Mailing address: Fred Hutchinson Cancer Research Center, Program in Infectious Diseases, 1124 Columbia St., Seattle, WA 98104. Phone: (206) 667-6795. Fax: (206) 667-4411. E-mail: vieiraj{at}u.washington.edu.

Journal of Virology, October 1998, p. 8158-8165, Vol. 72, No. 10
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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