Stopping Autoinducer‑2 Chatter by Means of an Indigenous Bacterium (Acinetobacter sp. DKY-1): A New Antibiofouling Strategy in a Membrane Bioreactor for Wastewater Treatment

Bacterial quorum quenching (QQ) by means of degrading signaling molecules has been applied to antibiofouling strategies in a membrane bioreactor (MBR) for wastewater treatment. However, the target signaling molecules have been limited to N-acyl homoserine lactones participating in intraspecies quoru...

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Published in:Environmental science & technology 2018-06, Vol.52 (11), p.6237-6245
Main Authors: Lee, Kibaek, Kim, Yea-Won, Lee, Seonki, Lee, Sang Hyun, Nahm, Chang Hyun, Kwon, Hyeokpil, Park, Pyung-Kyu, Choo, Kwang-Ho, Koyuncu, Ismail, Drews, Anja, Lee, Chung-Hak, Lee, Jung-Kee
Format: Article
Language:English
Subjects:
Acinetobacter
Bacteria
Beads
Biofouling
Bioreactors
Chatter
Deactivation
Detection
Energy conservation
Homoserine lactones
Inactivation
Lactones
Membrane reactors
Molecular biology
Molecular chains
Molecular weight
Molecules
N-Acyl homoserine lactone
Quenching
Signaling
Wastewater treatment
Water treatment
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Summary:Bacterial quorum quenching (QQ) by means of degrading signaling molecules has been applied to antibiofouling strategies in a membrane bioreactor (MBR) for wastewater treatment. However, the target signaling molecules have been limited to N-acyl homoserine lactones participating in intraspecies quorum sensing. Here, an approach to disrupting autoinducer-2 (AI-2) signaling molecules participating in interspecies quorum sensing was pursued as a next-generation antibiofouling strategy in an MBR for wastewater treatment. We isolated an indigenous QQ bacterium (Acinetobacter sp. DKY-1) that can attenuate the expression of the quorum-sensing (QS) response through the inactivation of an autoinducer-2 signaling molecule, 4,5-dihydroxy-2,3-pentanedione (DPD), among four kinds of autoinducer-2 QS bacteria. DKY-1 released AI-2 QQ compounds, which were verified to be hydrophilic with a molecular weight of
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.7b05824