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To investigate the size of herpes simplex virus (HSV) thymidine kinase (TK) polypeptides, procedures have been devised to purify the enzyme from infected cells labeled with 35S-methionine by (i) affinity chromatography on Sepharose-5'-amino-5'-deoxythymidine; (ii) preparative isoelectric focusing or preparative PAGE; and (iii) glycerol gradient centrifugation. Portions of enzyme fractions, at each purification step, were also treated with an immunoadsorbent, Sepharose-anti-HSV-1 TK immunoglobulin (IgG). Labeled polypeptides eluted from the immunoadsorbent were analyzed by electrophoresis in SDS slab gels and autoradiography. The results demonstrate that the molecular weights of HSV TK polypeptides are about 40,000. TK-negative HSV-1 mutant B2006 failed to induce the 40 K dalton polypeptide.
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