Buchnera aphidicola str. Tuc7 (Acyrthosiphon pisum)

Names Buchnera aphidicola str. Tuc7 (Acyrthosiphon pisum)
Accession numbers NC_011834
Background Buchnera aphidicola subsp. Cinara cedri is the primary endosymbiont of the aphid Cinara cedri. The aphid-Buchnera association has persisted for at least 160 million years and it is obligate for both partners. Its genome is composed of a 416380-base pair circular chromosome plus a 6045-base pair plasmid for leucine. This genome is ca. 200 kilobases smaller than the other Buchnera aphidicola genomes sequenced so far. Gene loss is the main cause of genome shrinkage and affects all functional categories, although not evenly. Gene losses affecting biosynthesis of nucleotides, cofactors, cell envelope and transport are particularly important. It is no longer able to synthesize tryptophan, it is unable to provide riboflavin to its host and lacks most of the transporters encoded by other B.aphidicola genomes. Buchnera aphidicola subsp. Cinara cedri could be undergoing a process of genome degradation and functional replacement by the coexisting secondary endosymbiont Serratia symbiotica. (EBI Integr8)
Strain Tuc7 (Acyrthosiphon pisum)
Complete Yes
Sequencing centre (06-JAN-2009) National Center for Biotechnology Information, NIH, Bethesda, MD 20894, USA
(18-SEP-2008) Ecology and Evolutionary Biology, University of Arizona, 1041 E Lowell Street, Tucson, AZ 85721, USA
Sequencing quality Level 6: Finished
Sequencing depth NA
Sequencing method NA
Isolation site isolated from an isofemale line of Acyrthosiphon kondoi (blue alfalfa aphid)
Isolation country USA
Number of replicons 1
Gram staining properties Negative
Shape NA
Mobility NA
Flagellar presence NA
Number of membranes NA
Oxygen requirements NA
Optimal temperature NA
Temperature range Mesophilic
Habitat HostAssociated
Biotic relationship Symbiotic
Host name Acyrthosiphon kondoi
Cell arrangement Singles
Sporulation NA
Metabolism NA
Energy source NA
Diseases NA
Pathogenicity No