title: Identification and characterization of mouse plexin B3 promoter.
abstract: Plexin B3 is a neurally expressed transmembrane receptor protein participating in growth cone remodelling and synaptic plasticity. Despite their biological importance no plexin promoter has been characterized so far. Regulation of mouse plexin B3 transcription was investigated using in silico analysis of promoter and inititation area, 5'RACE, reporter-gene assays, gelshift and co-expression experiments. As a result we have described a novel 5' exon and show that a 234 basepair region upstream of it exhibits promoter activity. Further analysis indicated that this region contains predicted binding sites for myeloid zinc finger protein 1 (MZF-1) and neurogenin 3 (Ngn3). Oligonucleotides corresponding to the recognition sequences of these factors produced a specific mobility shift in EMSA. Expression of the reporter gene attached to the 234 region was increased 2-fold by Ngn3 and reduced twice in response to MZF-1 over-expression. These results help to better comprehend mechanisms used for plexin B3 transcriptional regulation.
authors.affiliation: Tallinn University of Technology, Department of Gene Technology, Tallinn, Akadeemia tee 15, 12618 Tallinn, Estonia.
authors.forename: Liivi
authors.initials: L
authors.lastname: Tiismus
authors.forename: Piret
authors.initials: P
authors.lastname: Laht
authors.forename: Maarja
authors.initials: M
authors.lastname: Otsus
authors.forename: Andres
authors.initials: A
authors.lastname: Veske
mesh_terms: D024506:5' Flanking Region; D000818:Animals; D001483:Base Sequence; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D001665:Binding Sites; D024202:Electrophoretic Mobility Shift Assay; D005091:Exons; D005786:Gene Expression Regulation; D017930:Genes, Reporter; D051741:Kruppel-Like Transcription Factors / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D041681:NIH 3T3 Cells; D009419:Nerve Tissue Proteins / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011956:Receptors, Cell Surface / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D051741:Kruppel-Like Transcription Factors; D009419:Nerve Tissue Proteins; D011956:Receptors, Cell Surface; C490095:Mzf1 protein, mouse; C407737:Neurog3 protein, mouse; C531216:plexin B3 protein, mouse