title: Multiple early transcripts and splicing of the Autographa californica nuclear polyhedrosis virus IE-1 gene.
abstract: The immediate-early IE-1 gene of Autographa californica nuclear polyhedrosis virus was cloned, and its nucleotide sequence was determined. Sequence analysis indicated that this gene would encode a protein of 582 amino acids with a predicted molecular weight of 66,822. Analysis of IE-1 gene expression during baculovirus infection identified two transcripts. One, 1.9 kilobases (kb), was expressed at constant steady-state levels throughout infection, whereas the other, 2.1 kb, was expressed only early in infection. Analysis of IE-1 cDNA clones demonstrated that the 2.1-kb transcript contained the entire 1.9-kb transcript (exon 1) plus an additional 5' end (exon 0). Genomic Southern analysis placed the exon 0 sequences on the EcoRI B fragment, 4 kilobase pairs upstream of exon 1. Sequencing of the upstream region identified an open reading frame whose 5' end was identical to the exon 0 sequences in the cDNAs. Examination of the genomic DNA sequences around the exon-exon junction revealed sequences similar to published consensus splice acceptor and donor sequences. This is the first example of splicing of any viral transcript during baculovirus infection.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D004279:DNA, Viral / Q000235:genetics; D005091:Exons; D005786:Gene Expression Regulation; D005814:Genes, Viral; D007304:Insect Viruses / Q000235:genetics*; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D012326:RNA Splicing; D012333:RNA, Messenger / Q000235:genetics; D012367:RNA, Viral / Q000235:genetics; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000235:genetics*
chemical_list: D004279:DNA, Viral; D012333:RNA, Messenger; D012367:RNA, Viral; D014764:Viral Proteins