title: An interaction between KSHV ORF57 and UIF provides mRNA-adaptor redundancy in herpesvirus intronless mRNA export.
abstract: The hTREX complex mediates cellular bulk mRNA nuclear export by recruiting the nuclear export factor, TAP, via a direct interaction with the export adaptor, Aly. Intriguingly however, depletion of Aly only leads to a modest reduction in cellular mRNA nuclear export, suggesting the existence of additional mRNA nuclear export adaptor proteins. In order to efficiently export Kaposi's sarcoma-associated herpesvirus (KSHV) intronless mRNAs from the nucleus, the KSHV ORF57 protein recruits hTREX onto viral intronless mRNAs allowing access to the TAP-mediated export pathway. Similarly however, depletion of Aly only leads to a modest reduction in the nuclear export of KSHV intronless mRNAs. Herein, we identify a novel interaction between ORF57 and the cellular protein, UIF. We provide the first evidence that the ORF57-UIF interaction enables the recruitment of hTREX and TAP to KSHV intronless mRNAs in Aly-depleted cells. Strikingly, depletion of both Aly and UIF inhibits the formation of an ORF57-mediated nuclear export competent ribonucleoprotein particle and consequently prevents ORF57-mediated mRNA nuclear export and KSHV protein production. Importantly, these findings highlight that redundancy exists in the eukaryotic system for certain hTREX components involved in the mRNA nuclear export of intronless KSHV mRNAs.
authors.affiliation: Institute of Molecular and Cellular Biology, University of Leeds, Leeds, United Kingdom.
authors.forename: Brian R
authors.initials: BR
authors.lastname: Jackson
authors.forename: James R
authors.initials: JR
authors.lastname: Boyne
authors.forename: Marko
authors.initials: M
authors.lastname: Noerenberg
authors.forename: Adam
authors.initials: A
authors.lastname: Taylor
authors.forename: Guillaume M
authors.initials: GM
authors.lastname: Hautbergue
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Walsh
authors.forename: Rachel
authors.initials: R
authors.lastname: Wheat
authors.forename: David J
authors.initials: DJ
authors.lastname: Blackbourn
authors.forename: Stuart A
authors.initials: SA
authors.lastname: Wilson
authors.forename: Adrian
authors.initials: A
authors.lastname: Whitehouse
mesh_terms: D021581:Active Transport, Cell Nucleus / Q000235:genetics; D002467:Cell Nucleus / Q000235:genetics / Q000378:metabolism* / Q000821:virology; D057809:HEK293 Cells; D019288:Herpesvirus 8, Human / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D012367:RNA, Viral / Q000235:genetics / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D009687:Nuclear Proteins; D012333:RNA, Messenger; D012367:RNA, Viral; D016601:RNA-Binding Proteins; D014764:Viral Proteins