Abstract
The Epstein-Barr virus-soluble (S) antigen extracted from RAJI cells was characterized by sucrose gradient centrifugation, gel filtration, and ion-exchange chromatography. The sedimentation coefficient was estimated to be 8.5S corresponding to a molecular weight of 180,000. The S antigen binds to DEAE-A25 ion exchanger from which it can be eluted with 0.3 M NaCl in Tris buffer (pH 7.2). All fractions which contained complement-fixing S antigen also inhibited the anticomplement immunofluorescence reaction as used to detect the Epstein-Barr virus-associated nuclear antigen. These results are consistent with the hypothesis that the S and Epstein-Barr virus-associated nuclear antigens are either a single antigen or that both activities are present on the same molecule.
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