title: ML3 is a NEDD8- and ubiquitin-modified protein.
abstract: NEDD8 (NEURAL PRECURSOR CELL-EXPRESSED, DEVELOPMENTALLY DOWN-REGULATED PROTEIN8) is an evolutionarily conserved 8-kD protein that is closely related to ubiquitin and that can be conjugated like ubiquitin to specific lysine residues of target proteins in eukaryotes. In contrast to ubiquitin, for which a broad range of substrate proteins are known, only a very limited number of NEDD8 target proteins have been identified to date. Best understood, and also evolutionarily conserved, is the NEDD8 modification (neddylation) of cullins, core subunits of the cullin-RING-type E3 ubiquitin ligases that promote the polyubiquitylation of degradation targets in eukaryotes. Here, we show that Myeloid differentiation factor-2-related lipid-recognition domain protein ML3 is an NEDD8- as well as ubiquitin-modified protein in Arabidopsis (Arabidopsis thaliana) and examine the functional role of ML3 in the plant cell. Our analysis indicates that ML3 resides in the vacuole as well as in endoplasmic reticulum (ER) bodies. ER bodies are Brassicales-specific ER-derived organelles and, similar to other ER body proteins, ML3 orthologs can only be identified in this order of flowering plants. ML3 gene expression is promoted by wounding as well as by the phytohormone jasmonic acid and repressed by ethylene, signals that are known to induce and repress ER body formation, respectively. Furthermore, ML3 protein abundance is dependent on NAI1, a master regulator of ER body formation in Arabidopsis. The regulation of ML3 expression and the localization of ML3 in ER bodies and the vacuole is in agreement with a demonstrated importance of ML3 in the defense to herbivore attack. Here, we extend the spectrum of ML3 biological functions by demonstrating a role in the response to microbial pathogens.
authors.affiliation: Department of Plant Systems Biology, Technische Universität München, 85354 Freising, Germany.
authors.forename: Jana P
authors.initials: JP
authors.lastname: Hakenjos
authors.forename: Sarosh
authors.initials: S
authors.lastname: Bejai
authors.forename: Quirin
authors.initials: Q
authors.lastname: Ranftl
authors.forename: Carina
authors.initials: C
authors.lastname: Behringer
authors.forename: A Corina
authors.initials: AC
authors.lastname: Vlot
authors.forename: Birgit
authors.initials: B
authors.lastname: Absmanner
authors.forename: Ulrich
authors.initials: U
authors.lastname: Hammes
authors.forename: Stephanie
authors.initials: S
authors.lastname: Heinzlmeir
authors.forename: Bernhard
authors.initials: B
authors.lastname: Kuster
authors.forename: Claus
authors.initials: C
authors.lastname: Schwechheimer
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D004721:Endoplasmic Reticulum / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D008969:Molecular Sequence Data; D010802:Phylogeny; D016415:Sequence Alignment; D054875:Ubiquitination; D014452:Ubiquitins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D014617:Vacuoles / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; C587483:ML3 protein, Arabidopsis; C513170:RUB1 protein, Arabidopsis; D014452:Ubiquitins
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