title: Ferredoxin-NADP+ oxidoreductase of C. paradoxa nucleus encoded, but cyanobacterial gene transfer from symbiont to host, an evolutionary mechanism originating new species.
abstract: The nucleus encoded cyanoplast ("cyanellar") ferredoxin-NADP + oxidoreductase (FNR) of Cyanophora paradoxa, characterized by an N-terminal amino acid sequence, is compared with homologous sequences of other photoautotrophic organisms. The high degree of similarity to the cyanobacterial sequences indicates a cyanobacterial origin. This could be a first direct demonstration of an intertaxonic combination: a gene transfer from an original endocytobiont (cyanobacterium) to the nucleus of its host, one of the most important demands of the Endosymbiosis Theory, an evolutionary mechanism leading to the origin of a new species.
authors.affiliation: Universität Tübingen, Botanisches Institut, Bundesrepublik Deutschland.
authors.forename: H E
authors.initials: HE
authors.lastname: Schenk
authors.forename: M G
authors.initials: MG
authors.lastname: Bayer
authors.forename: T L
authors.initials: TL
authors.lastname: Maier
authors.forename: A
authors.initials: A
authors.lastname: Lüttke
authors.forename: U B
authors.initials: UB
authors.lastname: Gebhart
authors.forename: S
authors.initials: S
authors.lastname: Stevanovic
mesh_terms: D000595:Amino Acid Sequence; D005075:Biological Evolution; D002467:Cell Nucleus / Q000502:physiology*; D000458:Cyanobacteria / Q000201:enzymology / Q000235:genetics*; D005287:Ferredoxin-NADP Reductase / Q000235:genetics* / Q000302:isolation & purification; D008969:Molecular Sequence Data; D010944:Plants / Q000201:enzymology / Q000235:genetics; D017385:Sequence Homology; D013559:Symbiosis; D014162:Transfection
chemical_list: D005287:Ferredoxin-NADP Reductase