PEF-1, an epithelial cell transcription factor which activates the long control region of human papillomavirus type 16, is glycosylated with N-acetylglucosamine
Author for correspondence: David Fergusson. Present address: Wellcome Unit for Molecular Parasitology, Anderson College, University of Glasgow, Byers Rd, Glasgow G11 6MU, UK. Fax +44 141 330 5422. e-mail D.Fergusson!udcf.gla.ac.uk
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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PEF-1, an epithelial cell transcription factor which activates the long control region of human papillomavirus type 16, is glycosylated with N-acetylglucosamine