title: HIV-1 splicing is controlled by local RNA structure and binding of splicing regulatory proteins at the major 5' splice site.
abstract: The 5' leader region of the human immunodeficiency virus 1 (HIV-1) RNA genome contains the major 5' splice site (ss) that is used in the production of the many spliced viral RNAs. This splice-donor (SD) region can fold into a stable stem-loop structure and the thermodynamic stability of this RNA hairpin influences splicing efficiency. In addition, splicing may be modulated by binding of splicing regulatory (SR) proteins, in particular SF2/ASF (SRSF1), SC35 (SRSF2), SRp40 (SRSF5) and SRp55 (SRSF6), to sequence elements in the SD region. The role of RNA structure and SR protein binding in splicing control was previously studied by functional analysis of mutant SD sequences. The interpretation of these studies was complicated by the fact that most mutations simultaneously affect both structure and sequence elements. We therefore tried to disentangle the contribution of these two variables by designing more precise SD region mutants with a single effect on either the sequence or the structure. The current analysis indicates that HIV-1 splicing at the major 5'ss is modulated by both the stability of the local RNA structure and the binding of splicing regulatory proteins.
authors.affiliation: Laboratory of Experimental Virology, Department of Medical Microbiology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam, The Netherlands.
authors.forename: Nancy
authors.initials: N
authors.lastname: Mueller
authors.affiliation: Laboratory of Experimental Virology, Department of Medical Microbiology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam, The Netherlands.
authors.forename: Ben
authors.initials: B
authors.lastname: Berkhout
authors.affiliation: Laboratory of Experimental Virology, Department of Medical Microbiology, Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, University of Amsterdam, The Netherlands.
authors.forename: Atze T
authors.initials: AT
authors.lastname: Das
mesh_terms: D002460:Cell Line; D017930:Genes, Reporter; D015497:HIV-1 / Q000235:genetics / Q000502:physiology*; D006801:Humans; D008156:Luciferases / Q000032:analysis / Q000235:genetics; D009690:Nucleic Acid Conformation; D022821:RNA Splice Sites; D012326:RNA Splicing; D012367:RNA, Viral / Q000737:chemistry* / Q000378:metabolism*; D016601:RNA-Binding Proteins / Q000378:metabolism*
chemical_list: D022821:RNA Splice Sites; D012367:RNA, Viral; D016601:RNA-Binding Proteins; D008156:Luciferases