title: A complete shikimate pathway in Toxoplasma gondii: an ancient eukaryotic innovation.
abstract: The shikimate pathway is essential for survival of the apicomplexan parasites Plasmodium falciparum, Toxoplasma gondii and Cryptosporidium parvum. As it is absent in mammals it is a promising therapeutic target. Herein, we describe the genes encoding the shikimate pathway enzymes in T. gondii. The molecular arrangement and phylogeny of the proteins suggests homology with the eukaryotic fungal enzymes, including a pentafunctional AROM. Current rooting of the eukaryotic evolutionary tree infers that the fungi and apicomplexan lineages diverged deeply, suggesting that the arom is an ancient supergene present in early eukaryotes and subsequently lost or replaced in a number of lineages.
authors.affiliation: Department of Immunology, Strathclyde Institute for Biomedical Sciences, University of Strathclyde, 27 Taylor Street, Glasgow, Scotland G4 ONR, UK.
authors.forename: S A
authors.initials: SA
authors.lastname: Campbell
authors.forename: T A
authors.initials: TA
authors.lastname: Richards
authors.forename: E J
authors.initials: EJ
authors.lastname: Mui
authors.forename: B U
authors.initials: BU
authors.lastname: Samuel
authors.forename: J R
authors.initials: JR
authors.lastname: Coggins
authors.forename: R
authors.initials: R
authors.lastname: McLeod
authors.forename: C W
authors.initials: CW
authors.lastname: Roberts
mesh_terms: D000429:Alcohol Oxidoreductases / Q000235:genetics; D000818:Animals; D001483:Base Sequence; D005057:Eukaryotic Cells / Q000201:enzymology*; D019143:Evolution, Molecular; D017125:Genes, Protozoan; D008969:Molecular Sequence Data; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000235:genetics; D010802:Phylogeny; D015398:Signal Transduction / Q000235:genetics*; D014122:Toxoplasma / Q000235:genetics*
chemical_list: D000429:Alcohol Oxidoreductases; C022641:Shikimate dehydrogenase; D017853:Phosphotransferases (Alcohol Group Acceptor); C022642:shikimate kinase