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Kaposi’s Sarcoma-Associated Herpesvirus ORF57 Protein: Exploiting All Stages of Viral mRNA Processing
School of Molecular and Cellular Biology, and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, UK
* Author to whom correspondence should be addressed.
Received: 18 June 2013; in revised form: 16 July 2013 / Accepted: 19 July 2013 / Published: 26 July 2013
Abstract: Nuclear mRNA export is a highly complex and regulated process in cells. Cellular transcripts must undergo successful maturation processes, including splicing, 5'-, and 3'-end processing, which are essential for assembly of an export competent ribonucleoprotein particle. Many viruses replicate in the nucleus of the host cell and require cellular mRNA export factors to efficiently export viral transcripts. However, some viral mRNAs undergo aberrant mRNA processing, thus prompting the viruses to express their own specific mRNA export proteins to facilitate efficient export of viral transcripts and allowing translation in the cytoplasm. This review will focus on the Kaposi’s sarcoma-associated herpesvirus ORF57 protein, a multifunctional protein involved in all stages of viral mRNA processing and that is essential for virus replication. Using the example of ORF57, we will describe cellular bulk mRNA export pathways and highlight their distinct features, before exploring how the virus has evolved to exploit these mechanisms.
Keywords: KSHV; herpesvirus; ORF57; TREX; mRNA export; mRNA stability
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Schumann, S.; Jackson, B.R.; Baquero-Perez, B.; Whitehouse, A. Kaposi’s Sarcoma-Associated Herpesvirus ORF57 Protein: Exploiting All Stages of Viral mRNA Processing. Viruses 2013, 5, 1901-1923.
Schumann S, Jackson BR, Baquero-Perez B, Whitehouse A. Kaposi’s Sarcoma-Associated Herpesvirus ORF57 Protein: Exploiting All Stages of Viral mRNA Processing. Viruses. 2013; 5(8):1901-1923.
Schumann, Sophie; Jackson, Brian R.; Baquero-Perez, Belinda; Whitehouse, Adrian. 2013. "Kaposi’s Sarcoma-Associated Herpesvirus ORF57 Protein: Exploiting All Stages of Viral mRNA Processing." Viruses 5, no. 8: 1901-1923.