title: Immunohistochemical localisation of a putative flavonoid transporter in grape berries.
abstract: Flavonoids are a class of secondary metabolites present in large amounts in grapevine (Vitis vinifera L.), which are involved in several aspects of its physiology (e.g. protection against biotic and abiotic stress). Even if the biosynthetic pathways of flavonoid sub-classes have been largely characterised, the mechanisms of their transport and accumulation to the final target sites are still not completely understood. Unanticipated insights have been obtained by probing plant tissues with pure antibodies targeting bilitranslocase (BTL, TCDB # 2.A.65.1.1), a mammalian transporter involved in the absorption and tissue distribution of dietary flavonoids. The occurrence of a BTL homologue has also been found in grape berries, in both tegumental layers of skin and pulp vascular bundles. In the skin, the expression of this protein starts from véraison (starting of the change in colour and softening of berries) and increases up to a maximum at the harvest stage, matching the same temporal pattern of flavonoid accumulation.
authors.affiliation: Department of Plant Biology and Protection, Section of Plant Biology, Udine University, Udine, Italy.
authors.forename: Elisa
authors.initials: E
authors.lastname: Petrussa
authors.forename: Enrico
authors.initials: E
authors.lastname: Braidot
authors.forename: Marco
authors.initials: M
authors.lastname: Zancani
authors.forename: Carlo
authors.initials: C
authors.lastname: Peresson
authors.forename: Alberto
authors.initials: A
authors.lastname: Bertolini
authors.forename: Sonia
authors.initials: S
authors.lastname: Patui
authors.forename: Valentino
authors.initials: V
authors.lastname: Casolo
authors.forename: Sabina
authors.initials: S
authors.lastname: Passamonti
authors.forename: Francesco
authors.initials: F
authors.lastname: Macrì
authors.forename: Angelo
authors.initials: A
authors.lastname: Vianello
mesh_terms: D053000:Analytic Sample Preparation Methods; D015153:Blotting, Western; D002570:Ceruloplasmin; D004591:Electrophoresis, Polyacrylamide Gel; D000431:Ethanol / Q000737:chemistry; D005419:Flavonoids / Q000378:metabolism*; D005638:Fruit / Q000166:cytology / Q000378:metabolism*; D007118:Immunoassay; D007150:Immunohistochemistry / Q000379:methods*; D008565:Membrane Proteins / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D008861:Microsomes / Q000378:metabolism; D021381:Protein Transport; D012639:Seeds / Q000166:cytology / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D027843:Vitis / Q000166:cytology / Q000378:metabolism*
chemical_list: D005419:Flavonoids; D008565:Membrane Proteins; D000431:Ethanol; D002570:Ceruloplasmin; C033838:bilitranslocase