title: Structure of commelinin, a blue complex pigment from the blue flowers of Commelina communis.
abstract: The X-ray crystal structure of natural commelinin is investigated. The results demonstrate that commelinin is a tetranuclear (4 Mg(2+)) metal complex, in which two Mg(2+) ions chelate to six anthocyanin molecules, while the other two Mg(2+) ions bind to six flavone molecules, stabilizing the commelinin complex, a new type of supramolecular complex.
authors.affiliation: Department of Physics, Graduate School of Science, Kyushu University, Fukuoka, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Shiono
authors.forename: Naohiro
authors.initials: N
authors.lastname: Matsugaki
authors.forename: Kosaku
authors.initials: K
authors.lastname: Takeda
mesh_terms: D001665:Binding Sites; D034822:Commelina / Q000737:chemistry*; D018360:Crystallography, X-Ray; D047309:Flavones / Q000737:chemistry* / Q000378:metabolism; D005419:Flavonoids / Q000737:chemistry* / Q000378:metabolism; D035264:Flowers / Q000737:chemistry*; D005960:Glucosides / Q000737:chemistry* / Q000378:metabolism; D008670:Metals / Q000378:metabolism; D008958:Models, Molecular; D008968:Molecular Conformation; D010858:Pigmentation; D010860:Pigments, Biological / Q000737:chemistry* / Q000378:metabolism
chemical_list: D047309:Flavones; D005419:Flavonoids; D005960:Glucosides; D008670:Metals; D010860:Pigments, Biological; C539639:delphinidin 3-O-(6-O-p-coumaroylglucoside)-5-O-(6-O-malonylglucoside); C539640:swertisin 4'-O-glucoside