title: Molecular characterization of the leucine plasmid from Buchnera aphidicola, primary endosymbiont of the aphid Acyrthosiphon pisum.
abstract: The complete sequence of the leucine plasmid of Buchnera aphidicola from the aphid Acyrthosiphon pisum (pLeu-BAp) is reported. Its gene organization was concordant with those of other leucine plasmids of Buchnera from aphids of the Aphidini and Macrosiphini tribes. Three inverted repeats are present in pLeu-BAp. Two of them are also present in pLeu from the family Aphididae: (i) SIR1, located downstream the leucine operon, resembles a rho-independent terminator of transcription, and (ii) LIR1, located upstream of the leucine operon, is suggested to be involved in transcription termination or messenger stability. The third, located near the putative ATGC repeats involved in the origin of replication, is specific in aphids of the Macrosiphini tribe. Phylogenetic analyses based on sequences of leuA, leuB, leuC, leuD, repA1 and ORF1 showed a closer relationship between Buchnera (A. pisum) and Buchnera (Diuraphis noxia). However, tree topologies indicate that the split between both aphid species took place soon after the formation of the Macrosiphini lineage.
authors.affiliation: Institut Cavanilles de Biodiversitat i Biologia Evolutiva and Departament de Genètica, Universitat de València, Apartat 22085, 46071 València, Spain.
authors.forename: T
authors.initials: T
authors.lastname: Soler
authors.forename: A
authors.initials: A
authors.lastname: Latorre
authors.forename: B
authors.initials: B
authors.lastname: Sabater
authors.forename: F J
authors.initials: FJ
authors.lastname: Silva
mesh_terms: D000818:Animals; D001042:Aphids / Q000382:microbiology*; D001483:Base Sequence; D020635:Buchnera / Q000235:genetics*; D005798:Genes, Bacterial; D007930:Leucine / Q000235:genetics*; D018895:Microsatellite Repeats; D018598:Minisatellite Repeats; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010802:Phylogeny; D010957:Plasmids / Q000235:genetics*; D013559:Symbiosis / Q000235:genetics
chemical_list: D007930:Leucine