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. 1991 Dec;65(12):6953–6960. doi: 10.1128/jvi.65.12.6953-6960.1991

Identification and characterization of the herpesvirus saimiri oncoprotein STP-C488.

J U Jung 1, R C Desrosiers 1
PMCID: PMC250805  PMID: 1658384

Abstract

The protein encoded by herpesvirus saimiri transforming gene STP-C488 was identified and characterized. Antibodies were produced in rabbits by immunization with keyhole limpet hemocyanin-conjugated synthetic peptides specific for the predicted sequence of STP-C488. STP-C488-encoded protein was detected in recombinant Escherichia coli, transformed Rat-1 cells, transfected COS-1 cells, and in common marmoset T lymphocytes immortalized by herpesvirus saimiri strain 488. STP-C488 protein was sensitive to treatment by bacterial collagenase, consistent with the 18 uninterrupted collagenlike repeats predicted by the DNA sequence. The apparent molecular size of STP-C488 in sodium dodecyl sulfate (SDS)-polyacrylamide gels (20 to 22 kDa) was considerably larger than that predicted from the DNA sequence (9.9 kDa). Using indirect immunofluorescence tests and subcellular fractionation, STP-C488 was found to be membrane bound, primarily in perinuclear compartments. The 18 uninterrupted collagenlike repeats, sensitivity to collagenase, location in the cell, and anomalous migration through SDS-polyacrylamide gels suggest an unusual, membrane-associated, fibrous structure for this transforming herpesvirus oncoprotein.

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