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Wang J, Lin J, Zhang Y, Zhang J, Feng T, Li H, Wang X, Sun Q, Zhang X, Wang Y. Activity Improvement and Vital Amino Acid Identification on the Marine-Derived Quorum Quenching Enzyme MomL by Protein Engineering. Mar Drugs 2019; 17:md17050300. [PMID: 31117226 PMCID: PMC6562636 DOI: 10.3390/md17050300] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 05/17/2019] [Accepted: 05/17/2019] [Indexed: 12/25/2022] Open
Abstract
MomL is a marine-derived quorum-quenching (QQ) lactonase which can degrade various N-acyl homoserine lactones (AHLs). Intentional modification of MomL may lead to a highly efficient QQ enzyme with broad application potential. In this study, we used a rapid and efficient method combining error-prone polymerase chain reaction (epPCR), high-throughput screening and site-directed mutagenesis to identify highly active MomL mutants. In this way, we obtained two candidate mutants, MomLI144V and MomLV149A. These two mutants exhibited enhanced activities and blocked the production of pathogenic factors of Pectobacterium carotovorum subsp. carotovorum (Pcc). Besides, seven amino acids which are vital for MomL enzyme activity were identified. Substitutions of these amino acids (E238G/K205E/L254R) in MomL led to almost complete loss of its QQ activity. We then tested the effect of MomL and its mutants on Pcc-infected Chinese cabbage. The results indicated that MomL and its mutants (MomLL254R, MomLI144V, MomLV149A) significantly decreased the pathogenicity of Pcc. This study provides an efficient method for QQ enzyme modification and gives us new clues for further investigation on the catalytic mechanism of QQ lactonase.
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Affiliation(s)
- Jiayi Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Jing Lin
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Yunhui Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Jingjing Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Tao Feng
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Hui Li
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Xianghong Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Qingyang Sun
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Xiaohua Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
- Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China.
- Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China.
| | - Yan Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
- Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China.
- Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China.
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