title: ORE9, an F-box protein that regulates leaf senescence in Arabidopsis.
abstract: Senescence is a sequence of biochemical and physiological events that constitute the final stage of development. The identification of genes that alter senescence has practical value and is helpful in revealing pathways that influence senescence. However, the genetic mechanisms of senescence are largely unknown. The leaf of the oresara9 (ore9) mutant of Arabidopsis exhibits increased longevity during age-dependent natural senescence by delaying the onset of various senescence symptoms. It also displays delayed senescence symptoms during hormone-modulated senescence. Map-based cloning of ORE9 identified a 693-amino acid polypeptide containing an F-box motif and 18 leucine-rich repeats. The F-box motif of ORE9 interacts with ASK1 (Arabidopsis Skp1-like 1), a component of the plant SCF complex. These results suggest that ORE9 functions to limit leaf longevity by removing, through ubiquitin-dependent proteolysis, target proteins that are required to delay the leaf senescence program in Arabidopsis.
authors.affiliation: Division of Molecular Life Sciences, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784 Korea.
authors.forename: H R
authors.initials: HR
authors.lastname: Woo
authors.forename: K M
authors.initials: KM
authors.lastname: Chung
authors.forename: J H
authors.initials: JH
authors.lastname: Park
authors.forename: S A
authors.initials: SA
authors.lastname: Oh
authors.forename: T
authors.initials: T
authors.lastname: Ahn
authors.forename: S H
authors.initials: SH
authors.lastname: Hong
authors.forename: S K
authors.initials: SK
authors.lastname: Jang
authors.forename: H G
authors.initials: HG
authors.lastname: Nam
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism; D000085:Acetates / Q000378:metabolism; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics / Q000502:physiology*; D029681:Arabidopsis Proteins; D001483:Base Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000378:metabolism / Q000502:physiology*; D003517:Cyclopentanes / Q000378:metabolism; D017931:DNA Primers; D005030:Ethylenes / Q000378:metabolism; D017343:Genes, Plant; D008969:Molecular Sequence Data; D009154:Mutation; D054883:Oxylipins; D018515:Plant Leaves / Q000502:physiology*; D010940:Plant Proteins / Q000378:metabolism; D017386:Sequence Homology, Amino Acid
chemical_list: C120363:ASK1 protein, Arabidopsis; D000085:Acetates; D029681:Arabidopsis Proteins; D002352:Carrier Proteins; D003517:Cyclopentanes; D017931:DNA Primers; D005030:Ethylenes; C435920:MAX2 protein, Arabidopsis; D054883:Oxylipins; D010940:Plant Proteins; D000040:Abscisic Acid; C072239:methyl jasmonate; C036216:ethylene