Epstein-Barr virus receptor of human B lymphocytes is the C3d receptor CR2.

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Abstract
Identity of the Epstein-Barr virus (EBV) receptor with the complement receptor type 2 (CR2) was established in 3 sets of experiments using the monoclonal antibodies, HB-5 and anti-B2, which recognize a MW 145,000 B-lymphocyte membrane protein that is CR2. First, the rank order for binding of fluoresceinated EBV to 4 lymphoblastoid cell lines (SB, JY, Raji and Molt-4) was identical to the rank order for binding of HB-5 and anti-B2 by analytical flow cytometry. Second, pretreatment of cells with HB-5 followed by treatment with goat F(ab'')2 fragments to mouse IgG blocked binding of fluoresceinated EBV on SB, a B-lymphoblastoid cell line. Virus attachment was not inhibited by HB-5 alone, second antibody alone, rabbit anti-C3b receptor or UPC10 (an irrelevant monoclonal antibody). Third, transfer of CR2 from SB to protein A-bearing Staphylococcus aureus particles, to which HB-5 had been absorbed, conferred on them the specific ability to bind 125I-labeled EBV. Evidently, CR2 is the EBV receptor of human B lymphocytes.