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A single RNA recognition motif in SR proteins directs them to nuclear sites of adenovirus transcription
Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Medical Biochemistry and Microbiology.
Manuscript (Other academic)
URN: urn:nbn:se:uu:diva-90984OAI: oai:DiVA.org:uu-90984DiVA: diva2:163538
Available from: 2003-10-28 Created: 2003-10-28 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Viruses as a Model System for Studies of Eukaryotic mRNA Processing
Open this publication in new window or tab >>Viruses as a Model System for Studies of Eukaryotic mRNA Processing
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Viruses depend on their hosts for the production and spread of new virus particles. For efficient virus replication, the viral genes have adapted the strategy of being recognized and processed by the cellular biosynthetic machineries. Viruses therefore provide an important tool to study the cellular machinery regulating gene expression. In this thesis, we have used two model DNA viruses; herpes simplex virus (HSV) and adenovirus, to study RNA processing at the level of pre-mRNA splicing in mammalian cells.

During a lytic infection, HSV cause an almost complete shut-off of host cell gene expression. Importantly, HSV infection cause inhibition of pre-mRNA splicing which is possibly advantageous to the virus, as only four HSV genes contain introns.

The HSV immediate early protein, ICP27, has been shown to modulate several post-transcriptional processes such as polyadenylation and pre-mRNA splicing. We have studied the role of ICP27 as an inhibitor of pre-mRNA splicing.

We show that ICP27 inhibits pre-mRNA splicing in vitro in the absence of other HSV proteins. We further show that ICP27 inhibits splicing at the level of spliceosome assembly. Importantly, ICP27 induced inhibition of splicing can be reversed, either by the addition of purified SR proteins or by the addition of an SR protein specific kinase, SRPK1. We propose that SR proteins are prime candidates as mediators of the inhibitory effect of ICP27 on pre-mRNA splicing.

In order to learn more about how splicing is organized in the cell nucleus in vivo, we investigated how cellular splicing factors are recruited to sites of transcription and splicing in adenovirus infected cells using confocal microscopy. Our results showed that the SR proteins, ASF/SF2 and SC35, are efficiently recruited to sites in the nucleus where adenovirus genes are transcribed and the resulting pre-mRNAs are processed. Our results demonstrate that only one of the two RNA recognition motifs (RRMs) present in the ASF/SF2 protein is required for its recruitment to active sites of splicing. The arginine/serine rich (RS) domain in ASF/SF2 is redundant and insufficient for the translocation of the protein to active viral polymerase II genes in adenovirus infected cells.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 52 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 0282-7476 ; 1297
Molecular biology, ICP27, herpes simplex virus, mRNA, splicing, adenovirus, ASF/SF2, Molekylärbiologi
National Category
Biochemistry and Molecular Biology
Research subject
Medical Virology
urn:nbn:se:uu:diva-3729 (URN)91-554-5775-4 (ISBN)
Public defence
2003-11-27, C8:305, BMC, Uppsala, 09:15
Available from: 2003-10-28 Created: 2003-10-28Bibliographically approved

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