title: Identification and characterization of a putative baculoviral transcriptional factor IE-1 from Choristoneura fumiferana granulovirus.
abstract: A gene that encodes a protein homologue to baculoviral IE-1 was identified and sequenced in the genome of the Choristoneura fumiferana granulovirus (ChfuGV). The gene has an 1278 nucleotide (nt) open-reading frame (ORF) that encodes 426 amino acids with an estimated molecular weight of 50.33 kDa. At the nucleotide level, several cis-acting regulatory elements were detected within the promoter region of the ie-1 gene of ChfuGV along with other studied granuloviruses (GVs). Two putative CCAAT elements were detected within the noncoding leader region of this gene; one was located on the opposite strand at -92 and the other at -420 nt from the putative start triplet. Two baculoviral late promoter motifs (TAAG) were also detected within the promoter region of the ie-1 gene of ChfuGV. A single polyadenylation signal, AATAAA, was located 18nt downstream of the putative translational stop codon of ie-1 from ChfuGV. At the protein level, the amino acid sequence data that was derived from the nucleotide sequence in ChfuGV IE-1 was compared to those of the Cydia pomonella granulovirus (CpGV), Xestia c-nigrum granulovirus (XcGV) and Plutella xylostella granulovirus (PxGV). The C-terminal regions of the granuloviral IE-1 sequences appeared to be more conserved when compared to the N-terminal regions. A domain, similar to the basic helix-loop-helix like (bHLH-like) domain in NPVs, was detected at the C-terminal region of IE-1 from ChfuGV (residues 387 to 414). A phylogenetic tree for baculoviral IE-1 was constructed using a maximum parsimony analysis. A phylogenetic estimation demonstrates that ChfuGV IE-1 is most closely related to that of CpGV.
authors.affiliation: Institut National de la Recherche scientifique-Institut Armand-Frappier, Québec, Canada.
authors.forename: Kianoush Khajeh
authors.initials: KK
authors.lastname: Rashidan
authors.forename: Nasha
authors.initials: N
authors.lastname: Nassoury
authors.forename: Abderrazzak
authors.initials: A
authors.lastname: Merzouki
authors.forename: Claude
authors.initials: C
authors.lastname: Guertin
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D016367:Baculoviridae / Q000378:metabolism*; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins; D025722:Granulovirus / Q000378:metabolism*; D017874:Immediate-Early Proteins / Q000737:chemistry* / Q000378:metabolism*; D008969:Molecular Sequence Data; D009036:Moths / Q000821:virology; D010802:Phylogeny; D011401:Promoter Regions, Genetic; D014176:Protein Biosynthesis; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid; D012984:Software; D015534:Trans-Activators / Q000737:chemistry* / Q000378:metabolism*; D014764:Viral Proteins / Q000737:chemistry* / Q000235:genetics*
chemical_list: C069183:Ac-IE-1 protein, Autographa californica nucleopolyhedrovirus; D004268:DNA-Binding Proteins; D017874:Immediate-Early Proteins; D015534:Trans-Activators; D014764:Viral Proteins; D004247:DNA