title: Rhizobium etli CFN42 contains at least three plasmids of the repABC family: a structural and evolutionary analysis.
abstract: In this paper, we report the identification of replication/partition regions of plasmid p42a and p42b of Rhizobium etli CFN42. Sequence analysis reveals that both replication/partition regions belong to the repABC family. Phylogenetic analysis of all the complete repABC replication/partition regions reported to date, shows that repABC plasmids coexisting in the same strain arose most likely by lateral transfer instead of by duplication followed by divergence. A model explaining how new incompatibility groups originate, is proposed.
authors.affiliation: Programa de Evolución Molecular, Centro de Investigación sobre Fijación de Nitrógeno, Universidad Nacional Autónoma de México, Apartado Postal 565-A, Cuernavaca, Morelos, Mexico. mac@cifn.unam.mx
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Cevallos
authors.forename: Helena
authors.initials: H
authors.lastname: Porta
authors.forename: Javier
authors.initials: J
authors.lastname: Izquierdo
authors.forename: Cristina
authors.initials: C
authors.lastname: Tun-Garrido
authors.forename: Alejandro
authors.initials: A
authors.lastname: García-de-los-Santos
authors.forename: Guillermo
authors.initials: G
authors.lastname: Dávila
authors.forename: Susana
authors.initials: S
authors.lastname: Brom
mesh_terms: D001483:Base Sequence; D003227:Conjugation, Genetic; D004269:DNA, Bacterial / Q000235:genetics*; D019143:Evolution, Molecular; D005798:Genes, Bacterial / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D010957:Plasmids / Q000145:classification* / Q000235:genetics*; D018741:Replication Origin / Q000235:genetics; D012231:Rhizobium / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial