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The human cytomegalovirus receptor on fibroblasts is a 30-kilodalton membrane protein.

Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.

ABSTRACT

Previous studies have demonstrated that human cytomegalovirus (HCMV) binding to human foreskin fibroblasts (HFF) is mediated by a single type of molecule, likely a glycoprotein, which serves as a specific receptor for the virus. In the present experiments, HCMV was found to bind to an HFF membrane protein with an approximate molecular mass of 30 kilodaltons (kDa); weak binding to 28- and 92-kDa membrane components was also observed. Binding was specific, as it was inhibited by excess unlabeled HCMV. Radiolabeled HCMV also bound selectively to Raji and Daudi lymphoblastoid cell membrane proteins of the same molecular masses. The 30-kDa radiolabeled HFF membrane protein bound to HCMV in solution; this binding was also specific, as it was blocked by an excess of HCMV. These data suggest that a membrane protein with a molecular mass of approximately 30 kDa mediates HCMV binding to several cell types.

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