A Genetic Circuit System Based on Quorum Sensing Signaling for Directed Evolution of Quorum‐Quenching Enzymes |
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Authors: | Jin‐Hyun Kim Sang‐Chul Lee Dr Hyun‐Ho Kyeong Hak‐Sung Kim? Prof Dr |
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Affiliation: | 1. Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373–1, Guseong‐dong, Yuseong‐gu, Daejeon, 305‐701 (Korea), Fax: (+82)?42‐350‐2610 hski;2. Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 373–1, Guseong‐dong, Yuseong‐gu, Daejeon, 305‐701 (Korea), Fax: (+82)?42‐350‐2610 hski;3. Graduate School of Nanoscience and Technology (WCU), Korea Advanced Institute of Science and Technology, 373–1, Guseong‐dong, Yuseong‐gu, Daejeon, 305–701 (Korea) |
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Abstract: | Quorum sensing is a cell–cell communication mechanism that is involved in the regulation of biological functions such as luminescence, virulence, and biofilm formation. Quorum‐quenching enzymes, which interrupt quorum‐sensing signaling through degradation of quorum‐sensing molecules, have emerged as a new approach to controlling and preventing bacterial virulence and pathogenesis. In an effort to develop quorum‐quenching enzymes with improved catalytic activities, a genetic circuit system based on acylhomoserine‐lactone (AHL)‐mediated quorum‐sensing signaling was constructed. The genetic circuit system was composed of lux‐R, lux‐I promoter, β‐lactamase, and β‐lactamase inhibitor, and designed to confer antibiotic resistance on host cells expressing an AHL‐degrading enzyme, thereby enabling rapid screening of quorum‐quenching enzymes. To demonstrate the utility of the genetic circuit system, we attempted the directed evolution of the AHL hydrolase from Bacillus sp. The genetic circuit system was shown to be effective in screening of quorum‐quenching enzymes with high catalytic efficiency. From these results it is expected that the genetic circuit system can be widely used for the isolation and directed evolution of quorum‐quenching enzymes with greater potential. |
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Keywords: | directed evolution enzymes genetic circuits high‐throughput screening lactones quorum quenching |
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