title: A proteomic analysis of Arabidopsis thaliana seedling responses to 3-oxo-octanoyl-homoserine lactone, a bacterial quorum-sensing signal.
abstract: N-acyl-homoserine lactones (AHLs) are a class of bacterial quorum-sensing (QS) signals that are commonly used by Gram-negative bacteria for cell-to-cell communication. Recently, it has become evident that AHLs can regulate plant root growth and trigger plant defense responses; however, little is known about the plant response mechanisms to bacterial QS signals. In this study, we used a proteomic approach to investigate the responses of Arabidopsis thaliana seedlings to N-3-oxo-octanoyl-homoserine lactone (3OC8-HSL), a bacterial QS signal. The results revealed that the abundance of 53 protein spots was significantly altered; two thirds of these proteins were found to be up-regulated after 3OC8-HSL treatment. Thirty-four proteins were identified using MALDI-TOF-MS. These 3OC8-HSL-responsive proteins, in addition to one protein of unknown function, are implicated in a variety of physiological processes, including metabolism of carbohydrate and energy, protein biosynthesis and quality control systems, defense response and signal transduction and cytoskeleton remodeling. Our bioinformatic analysis indicated that the chloroplasts are the intracellular organelles most influenced by the exposure to 3OC8-HSL. Our data indicate that plants have an extensive range of functional responses to bacterial AHLs that may play important roles in the interaction between plants and bacteria.
authors.affiliation: Biology Institute, Hebei Academy of Sciences, Shijiazhuang 050051, China. chunjuanjay@163.com
authors.forename: Chunjuan
authors.initials: C
authors.lastname: Miao
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhao
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Jia
authors.forename: Shuishan
authors.initials: S
authors.lastname: Song
mesh_terms: D017360:Arabidopsis / Q000187:drug effects* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000032:analysis / Q000378:metabolism*; D006714:Homoserine / Q000031:analogs & derivatives* / Q000494:pharmacology; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D040901:Proteomics; D053038:Quorum Sensing; D036226:Seedlings / Q000187:drug effects* / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D029681:Arabidopsis Proteins; C080518:N-(beta-oxooctan-1-oyl)homoserine lactone; D006714:Homoserine