1887

Abstract

Infection by human papillomavirus type 16 (HPV- 16) has been linked to cervical cancer. The transcription of viral genes in HPV-16 is partially controlled by a number of cellular transcription factors. We have previously identified a novel cellular transcription factor, PEF-1, from its ability to interact with the long control region (LCR) of HPV- 16. This factor has a molecular mass of about 110 kDa and binds to a GC-rich sequence in the section of the LCR responsible for cell type-specific transcription from viral DNA. The factor Sp1 has similar properties and also interacts with the HPV- 16 LCR. We show that PEF-1 and Sp1 are distinct transcription factors: they recognize different DNA sequences, have different electrophoretic mobilities and different glycosylation patterns. Sp1 is O- glycosylated while PEF-1 appears to have a novel type of glycosylation, as shown by the interaction with pokeweed lectin and by the inhibition of this interaction by tunicamycin.

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1998-11-01
2022-09-25
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