SF2/ASF Binds the Human Papillomavirus Type 16 Late RNA Control Element and Is Regulated during Differentiation of Virus-Infected Epithelial Cells
| Autor: | Iain M. Morgan, Steven G. Milligan, Maria G. McPhillips, Thanaporn Veerapraditsin, Winifred Boner, Dimitra Karali, Sarah A. Cumming, Sheila V. Graham |
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| Rok vydání: | 2004 |
| Předmět: |
Gene Expression Regulation
Viral Cytoplasm Spliceosome RNA Splicing Immunology RNA-binding protein Regulatory Sequences Nucleic Acid Biology Microbiology Cell Line Exon SR protein Virology RNA Precursors Humans snRNP RNA Messenger Phosphorylation 3' Untranslated Regions Papillomaviridae Ribonucleoprotein Cell Nucleus Serine-Arginine Splicing Factors Alternative splicing Nuclear Proteins RNA-Binding Proteins Cell Differentiation Epithelial Cells Oncogene Proteins Viral Splicing Factor U2AF Molecular biology Virus-Cell Interactions DNA-Binding Proteins Ribonucleoproteins Insect Science RNA splicing RNA Viral Protein Binding |
| Zdroj: | Journal of Virology. 78:10598-10605 |
| ISSN: | 1098-5514 0022-538X |
| Popis: | Pre-mRNA splicing occurs in the spliceosome, which is composed of small ribonucleoprotein particles (snRNPs) and many non-snRNP components. SR proteins, so called because of their C-terminal arginine- and serine-rich domains (RS domains), are essential members of this class. Recruitment of snRNPs to 5′ and 3′ splice sites is mediated and promoted by SR proteins. SR proteins also bridge splicing factors across exons to help to define these units and have a central role in alternative and enhancer-dependent splicing. Here, we show that the SR protein SF2/ASF is part of a complex that forms upon the 79-nucleotide negative regulatory element (NRE) that is thought to be pivotal in posttranscriptional regulation of late gene expression in human papillomavirus type 16 (HPV-16). However, the NRE does not contain any active splice sites, is located in the viral late 3′ untranslated region, and regulates RNA-processing events other than splicing. The level of expression and extent of phosphorylation of SF2/ASF are upregulated with epithelial differentiation, as is subcellular distribution, specifically in HPV-16-infected epithelial cells, and expression levels are controlled, at least in part, by the virus transcription regulator E2. |
| Databáze: | OpenAIRE |
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