title: The replication origin position and its relationship to a negative trans-acting transcription regulator encoded by Dictyostelium discoideum nuclear plasmid Ddp1.
abstract: The replication origin of the Dictyostelium discoideum plasmid Ddp1 was localized to a 543-bp region. This includes most of the AT-rich intergenic region between the G1 and G5/D6 genes containing both of their promoters and multiple copies of a TTTTGACT repeat. The G5/D6 gene, which lies adjacent to, and partially overlaps, the 543-bp origin region, encodes a trans-acting factor that negatively regulates transcription of the G4/D5 gene. Inactivation of the G5/D6 gene led to expression of a transcript (G6) 0.2 kb larger than the D5 transcript from the G4/D5 gene in vegetative and developing cells. The G5/D6 gene also regulates transcription of the G1, G2/G3/D4 and G5/D6 genes either alone or in concert with other Ddp1 gene products.
authors.affiliation: Department of Biology, Utah State University, Logan 84322-5500, USA.
authors.forename: H
authors.initials: H
authors.lastname: Kiyosawa
authors.forename: J E
authors.initials: JE
authors.lastname: Hughes
authors.forename: D L
authors.initials: DL
authors.lastname: Welker
mesh_terms: D000818:Animals; D001483:Base Sequence; D004023:Dictyostelium / Q000235:genetics*; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics*; D018741:Replication Origin; D014158:Transcription, Genetic