title: Characterization of Arabidopsis ABCG11/WBC11, an ATP binding cassette (ABC) transporter that is required for cuticular lipid secretion.
abstract: ABCG11/WBC11, an ATP binding cassette (ABC) transporter from Arabidopsis thaliana, is a key component of the export pathway for cuticular lipids. Arabidopsis wbc11 T-DNA insertional knock-out mutants exhibited lipidic inclusions inside epidermal cells similar to the previously characterized wax transporter mutant cer5, with a similar strong reduction in the alkanes of surface waxes. Moreover, the wbc11 knock-out mutants also showed defects not present in cer5, including post-genital organ fusions, stunted growth and a reduction in cutin load on the plant surface. A mutant line previously isolated in a forward genetics screen, called permeable leaves 1 (pel1), was identified as an allele of ABCG11/WBC11. The double knock-out wbc11 cer5 exhibited the same morphological and biochemical phenotypes as the wbc11 knock-out. A YFP-WBC11 fusion protein rescued a T-DNA knock-out mutant and was localized to the plasma membrane. These results show that WBC11 functions in secretion of surface waxes, possibly by interacting with CER5. However, unlike ABCG12/CER5, ABCG11/WBC11 is important to the normal process of cutin formation.
authors.affiliation: Department of Botany, University of British Columbia, Vancouver, BC, Canada V6T 1Z4.
authors.forename: David
authors.initials: D
authors.lastname: Bird
authors.forename: Fred
authors.initials: F
authors.lastname: Beisson
authors.forename: Alexandra
authors.initials: A
authors.lastname: Brigham
authors.forename: John
authors.initials: J
authors.lastname: Shin
authors.forename: Stephen
authors.initials: S
authors.lastname: Greer
authors.forename: Reinhard
authors.initials: R
authors.lastname: Jetter
authors.forename: Ljerka
authors.initials: L
authors.lastname: Kunst
authors.forename: Xuemin
authors.initials: X
authors.lastname: Wu
authors.forename: Alexander
authors.initials: A
authors.lastname: Yephremov
authors.forename: Lacey
authors.initials: L
authors.lastname: Samuels
mesh_terms: D000070996:ATP Binding Cassette Transporter, Subfamily G; D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism*; D000483:Alleles; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D001692:Biological Transport; D005227:Fatty Acids / Q000378:metabolism; D008563:Membrane Lipids / Q000378:metabolism*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009154:Mutation; D019441:Plant Epidermis / Q000648:ultrastructure; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D014885:Waxes / Q000378:metabolism
chemical_list: C525930:ABCG11 protein, Arabidopsis; D000070996:ATP Binding Cassette Transporter, Subfamily G; D018528:ATP-Binding Cassette Transporters; D029681:Arabidopsis Proteins; D005227:Fatty Acids; D008563:Membrane Lipids; D011993:Recombinant Fusion Proteins; D014885:Waxes; C000521:cutin