title: Characterization of bro-b gene of Spodoptera litura multicapsid nucleopolyhedrovirus.
abstract: Spodoptera litura multicapsid nucleopolyhedrovirus (SpltMNPV) ORF125 (designated as the bro-b gene) is a member of the unique multigene family called the baculovirus repeated ORFs (bro) family. Computer-assisted analysis revealed that BRO-B contains a conserved Bro-N domain in its N-terminus and a single-stranded DNA (ssDNA) binding motif in the middle region. In vitro the bro-b gene transcription was present at 12 h post-infection (p.i.) and remained detectable up to 96 h p.i. Western blot analysis of BRO-B expression with an antiserum made against 6xHis tagged BRO-B expressed in Escherichia coli showed that it was present from 12 h through 96 h p.i. in vitro. Structural localization revealed that BRO-B could be found in the nucleocapsid components of both occlusion-derived virus (ODV) and budded virus (BV). Immunofluorescence analysis indicated that BRO-B is located only in the nucleus of infected S. litura cells. Furthermore, Western blot analysis indicated that BRO-B was associated with nuclear structures. These results suggested that BRO-B might be a nuclear-associated protein.
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D004279:DNA, Viral / Q000737:chemistry; D020869:Gene Expression Profiling; D015967:Gene Expression Regulation, Viral; D005814:Genes, Viral; D007814:Larva / Q000254:growth & development / Q000821:virology; D008969:Molecular Sequence Data; D017924:Nucleopolyhedroviruses / Q000235:genetics* / Q000254:growth & development; D016366:Open Reading Frames / Q000235:genetics; D017434:Protein Structure, Tertiary; D018411:Spodoptera / Q000166:cytology / Q000821:virology*; D013347:Subcellular Fractions / Q000737:chemistry; D014158:Transcription, Genetic; D014758:Viral Core Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D004279:DNA, Viral; D014758:Viral Core Proteins