title: Virus-specific splicing inhibitor in extracts from cells infected with HIV-1.
abstract: Human immunodeficiency virus type 1 (HIV-1), in contrast with most other retroviruses, encodes trans-regulatory proteins for virus gene expression. It is shown in this study, by means of an in vitro splicing system, that nuclear extracts obtained from cells infected with HIV-1 contain a factor (or factors) that specifically inhibits splicing of a synthetic SP6/HIV pre-messenger RNA (pre-mRNA)-containing donor and acceptor splice sites in the coding region for the envelope protein. It is also shown that the SP6/HIV pre-mRNA is not capable of assembly in a ribonucleoprotein complex, spliceosome, in extracts from infected cells. These findings raise the possibility that specific inhibition of pre-mRNA splicing in the envelope protein coding region by HIV-1 trans-regulatory factors might be one control mechanism for efficient production of structural viral proteins and virion assembly.
mesh_terms: D002467:Cell Nucleus / Q000502:physiology; D003001:Cloning, Molecular; D004252:DNA Mutational Analysis; D005786:Gene Expression Regulation; D006678:HIV / Q000235:genetics*; D006367:HeLa Cells; D006801:Humans; D012323:RNA Processing, Post-Transcriptional; D012326:RNA Splicing; D012367:RNA, Viral / Q000235:genetics*; D012261:Ribonucleoproteins / Q000502:physiology
chemical_list: D012367:RNA, Viral; D012261:Ribonucleoproteins