title: The striking case of tryptophan provision in the cedar aphid Cinara cedri.
abstract: Buchnera aphidicola BCc has lost its symbiotic role as the tryptophan supplier to the aphid Cinara cedri. We report the presence of a plasmid in this endosymbiont that contains the trpEG genes. The remaining genes for the pathway (trpDCBA) are located on the chromosome of the secondary endosymbiont "Candidatus Serratia symbiotica." Thus, we propose that a symbiotic consortium is necessary to provide tryptophan.
authors.affiliation: Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, Apartado de Correos 2085, 46071 Valencia, Spain.
authors.forename: María José
authors.initials: MJ
authors.lastname: Gosalbes
authors.forename: Araceli
authors.initials: A
authors.lastname: Lamelas
authors.forename: Andrés
authors.initials: A
authors.lastname: Moya
authors.forename: Amparo
authors.initials: A
authors.lastname: Latorre
mesh_terms: D000818:Animals; D001042:Aphids / Q000382:microbiology*; D020635:Buchnera / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D005798:Genes, Bacterial / Q000235:genetics; D017403:In Situ Hybridization; D008957:Models, Genetic; D008969:Molecular Sequence Data; D010957:Plasmids / Q000235:genetics / Q000378:metabolism; D013559:Symbiosis / Q000235:genetics; D014364:Tryptophan / Q000378:metabolism*
chemical_list: D014364:Tryptophan