title: Characterization of N-Acylhomoserine Lactones Produced by Bacteria Isolated from Industrial Cooling Water Systems.
abstract: The cooling water systems are used to remove heat generated in the various industries. Biofouling of the cooling water systems causes blocking of condenser pipes and the heat exchanger tubes. In many Gram-negative bacteria, N-acylhomoserine lactone (AHL) are used as quorum-sensing signal molecule and associated with biofilm formation. To investigate the relationship between quorum sensing and biofouling in the cooling water system, we isolated a total of 192 bacterial strains from the five cooling water systems, and screened for AHL production. Seven isolates stimulated AHL-mediated purple pigment production in AHL reporter strain Chromobacterium violaceum CV026 or VIR07. Based on their 16S rRNA gene sequences, AHL-producing isolates were assigned to Aeromonas hydrophila, Lysobacter sp., Methylobacterium oryzae, and Bosea massiliensis. To the best of our knowledge, B. massiliensis and Lysobacter sp. have not been reported as AHL-producing species in the previous researches. AHLs extracted from the culture supernatants of B. massiliensis and Lysobacter sp. were identified by liquid chromatography-mass spectrometry. AHLs produced by B. massiliensis were assigned as N-hexanoyl-L-homoserine lactone (C6-HSL), N-(3-oxohexanoyl)-L-homoserine lactone (3-oxo-C6-HSL), and N-(3-oxooctanoyl)-L-homoserine lactone (3-oxo-C8-HSL). AHLs produced by Lysobacter sp. were assigned as N-decanoyl-L-homoserine lactone (C10-HSL) and N-(3-oxodecanoyl)-L-homoserine lactone (3-oxo-C10-HSL). This is the first report of identification of AHLs produced by B. massiliensis and Lysobacter sp. isolated from the cooling water system.
authors.affiliation: Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan. noriya.okutsu@kurita.co.jp.
authors.forename: Noriya
authors.initials: N
authors.lastname: Okutsu
authors.affiliation: Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan. morohosi@cc.utsunomiya-u.ac.jp.
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Morohoshi
authors.affiliation: Center for Bioscience Research and Education, Utsunomiya University, 350 Mine-machi, Utsunomiya, Tochigi 321-8505, Japan. xie@cc.utsunomiya-u.ac.jp.
authors.forename: Xiaonan
authors.initials: X
authors.lastname: Xie
authors.affiliation: Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan. katon@cc.utsunomiya-u.ac.jp.
authors.forename: Norihiro
authors.initials: N
authors.lastname: Kato
authors.affiliation: Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan. tikeda@cc.utsunomiya-u.ac.jp.
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Ikeda
mesh_terms: D054742:Acyl-Butyrolactones / Q000032:analysis* / Q000737:chemistry* / Q000378:metabolism; D001419:Bacteria / Q000302:isolation & purification / Q000378:metabolism*; D057219:Biofouling; D007221:Industry; D014871:Water Microbiology
chemical_list: D054742:Acyl-Butyrolactones
keywords: Bosea massiliensis; Lysobacter sp.; N-acylhomoserine lactone; industrial cooling water system; quorum sensing