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Purification of a protein (60K/58K) associated with the Epstein‐Barr virus‐induced early antigen complex in Raji cells
Author(s) -
Dölken Gottfried,
Lange Winand,
Weitzmann Ulrike,
Hirsch Friedrich W.,
Löhr Georg W.
Publication year - 1983
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.2910320308
Subject(s) - raji cell , isoelectric point , antigen , isoelectric focusing , microbiology and biotechnology , gel electrophoresis , antibody , chemistry , polyacrylamide gel electrophoresis , chromatography , biology , biochemistry , immunology , enzyme
Abstract A double antibody sandwich ELISA has been established for the detection and quantitation of EBV‐associated early antigens (EA) in IUdR‐induced Raji cells. The EA complex extracted from Raji cells could be separated by ion exchange chromatography and isoelectric focusing into several components. One EA‐associated subspecificity has been purified by DEAE‐, CM‐, and Blue‐Sepharose chromatography followed by isoelectric focusing. The isolated protein has an apparent molecular weight of 240,000 ± 20,000 daltons under non‐dissociating conditions on Sephacryl S‐300, an isoelectric point of 4.5, and seems to be composed of two polypeptides of 60,000 and 58,000 daltons as shown by SDS‐gel electrophoresis and two‐dimensional gel electrophoresis. Preliminary data indicate that the 58,000 polypeptide is generated by limited proteolysis of the 60,000 polypeptide. The EA activity of the isolated protein has been confirmed by the double antibody sandwich ELISA and its reactivity with anti‐EA‐positive sera in an ELISA for the detection of anti‐EA antibodies.