1
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Bai X, Chen H, Ren X, Zhong L, Wang X, Ji X, Zhang Y, Wang Y, Bian X. Heterologous Biosynthesis of Complex Bacterial Natural Products in Burkholderia gladioli. ACS Synth Biol 2023; 12:3072-3081. [PMID: 37708405 DOI: 10.1021/acssynbio.3c00389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023]
Abstract
Bacterial natural products (NPs) are an indispensable source of drugs and biopesticides. Heterologous expression is an essential method for discovering bacterial NPs and the efficient biosynthesis of valuable NPs, but the chassis for Gram-negative bacterial NPs remains inadequate. In this study, we built a Burkholderiales mutant Burkholderia gladioli Δgbn::attB by introducing an integrated site (attB) to inactivate the native gladiolin (gbn) biosynthetic gene cluster, which stabilizes large foreign gene clusters and reduces the native metabolite profile. The growth and successful heterologous production of high-value NPs such as phylogenetically close Burkholderiales-derived antitumor polyketides (PKs) rhizoxins, phylogenetically distant Gammaproteobacteria-derived anti-MRSA (methicillin-resistant Staphylococcus aureus) antibiotics WAP-8294As, and Deltaproteobacteria-derived antitumor PKs disorazols demonstrate that this strain is a potential chassis for Gram-negative bacterial NPs. We further improved the yields of WAP-8294As through promoter insertions and precursor pathway overexpression based on heterologous expression in this strain. This study provides a robust bacterial chassis for genome mining, efficient production, and molecular engineering of bacterial NPs.
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Affiliation(s)
- Xianping Bai
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Hanna Chen
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Xiangmei Ren
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Lin Zhong
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Xingyan Wang
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Xiaoqi Ji
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Youming Zhang
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
| | - Yan Wang
- College of Marine Life Sciences, and Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao, Shandong 266100, China
| | - Xiaoying Bian
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong 266237, China
- Key Laboratory of Tobacco Pest Monitoring & Integrated Management, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China
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2
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Luo J, Li X, Wang H, Du L, Shen Y, Li Y. Identification and Characterization of the 28- N-Methyltransferase Involved in HSAF Analogue Biosynthesis. Biochemistry 2022; 61:2879-2883. [DOI: 10.1021/acs.biochem.2c00575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jie Luo
- Key Laboratory of Chemical Biology of Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, P. R. China
| | - Xue Li
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, P. R. China
| | - Haoxin Wang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, P. R. China
| | - Liangcheng Du
- Department of Chemistry, University of Nebraska─Lincoln, Lincoln, Nebraska 68588, USA
| | - Yuemao Shen
- Key Laboratory of Chemical Biology of Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, P. R. China
| | - Yaoyao Li
- Key Laboratory of Chemical Biology of Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, P. R. China
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3
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Dou Q, Yuan J, Yu R, Yang J, Wang J, Zhu Y, Zhong J, Long H, Liu Z, Wang X, Li Y, Xiao Y, Liang J, Zhang X, Wang Y. MomL inhibits bacterial antibiotic resistance through the starvation stringent response pathway. MLIFE 2022; 1:428-442. [PMID: 38818489 PMCID: PMC10989899 DOI: 10.1002/mlf2.12016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 01/20/2022] [Accepted: 02/27/2022] [Indexed: 06/01/2024]
Abstract
Antibiotic resistance in gram-negative pathogens has become one of the most serious global public health threats. The role of the N-acyl homoserine lactone (AHL)-mediated signaling pathway, which is widespread in gram-negative bacteria, in the bacterial resistance process should be studied in depth. Here, we report a degrading enzyme of AHLs, MomL, that inhibits the antibiotic resistance of Pseudomonas aeruginosa through a novel mechanism. The MomL-mediated reactivation of kanamycin is highly associated with the relA-mediated starvation stringent response. The degradation of AHLs by MomL results in the inability of LasR to activate relA, which, in turn, stops the activation of downstream rpoS. Further results show that rpoS directly regulates the type VI secretion system H2-T6SS. Under MomL treatment, inactivated RpoS fails to regulate H2-T6SS; therefore, the expression of effector phospholipase A is reduced, and the adaptability of bacteria to antibiotics is weakened. MomL in combination with kanamycin is effective against a wide range of gram-negative pathogenic bacteria. Therefore, this study reports a MomL-antibiotic treatment strategy on antibiotic-resistant bacteria and reveals its mechanism of action.
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Affiliation(s)
- Qin Dou
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
| | - Jin Yuan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhouChina
| | - Rilei Yu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and PharmacyOcean University of ChinaQingdaoChina
| | - Jiahui Yang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhouChina
| | - Jiayi Wang
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
| | - Yuxiang Zhu
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
| | - Jing Zhong
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhouChina
| | - Hongan Long
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
| | - Zhiqing Liu
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
| | - Xianghong Wang
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
| | - Yuying Li
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
| | - Yichen Xiao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhouChina
| | - Jiazhen Liang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and PharmacyOcean University of ChinaQingdaoChina
| | - Xiao‐Hua Zhang
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
- Laboratory for Marine Ecology and Environmental ScienceQingdao National Laboratory for Marine Science and TechnologyQingdaoChina
| | - Yan Wang
- College of Marine Life Sciences, and Institute of Evolution & Marine BiodiversityOcean University of ChinaQingdaoChina
- Laboratory for Marine Ecology and Environmental ScienceQingdao National Laboratory for Marine Science and TechnologyQingdaoChina
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4
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Novel indole-mediated potassium ion import system confers a survival advantage to the Xanthomonadaceae family. THE ISME JOURNAL 2022; 16:1717-1729. [PMID: 35319020 DOI: 10.1038/s41396-022-01219-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 03/02/2022] [Accepted: 03/07/2022] [Indexed: 12/30/2022]
Abstract
Interspecific and intraspecific communication systems of microorganisms are involved in the regulation of various stress responses in microbial communities. Although the significance of signaling molecules in the ubiquitous family Xanthomonadaceae has been reported, the role bacterial communications play and their internal mechanisms are largely unknown. Here, we use Lysobacter enzymogenes, a member of Xanthomonadaceae, to identify a novel potassium ion import system, LeKdpXFABC. This import system participates in the indole-mediated interspecies signaling pathway and matters in environmental adaptation. Compared with the previously reported kdpFABC of Escherichia coli, LekdpXFABC contains a novel indispensable gene LekdpX and is directly regulated by the indole-related two-component system QseC/B. QseC autophosphorylation is involved in this process. The operon LekdpXFABC widely exists in Xanthomonadaceae. Moreover, indole promotes antimicrobial product production at the early exponential phase. Further analyses show that indole enhances potassium ion adsorption on the cell surface by upregulating the production of O-antigenic polysaccharides. Finally, we confirm that LeKdpXFABC mediation by indole is subject to the intraspecific signaling molecules DSFs, of which the biosynthesis genes always exist together with LekdpXFABC. Therefore, as a new idea, the signal collaborative strategy of indole and DSFs might ensure the persistent fitness advantage of Xanthomonadaceae in variable environments.
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Pseudomonas protegens FJKB0103 Isolated from Rhizosphere Exhibits Anti-Methicillin-Resistant Staphylococcus aureus Activity. Microorganisms 2022; 10:microorganisms10020315. [PMID: 35208770 PMCID: PMC8877278 DOI: 10.3390/microorganisms10020315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 01/14/2022] [Accepted: 01/19/2022] [Indexed: 02/01/2023] Open
Abstract
Staphylococcus aureus is amongst the most virulent pathogens, causing chronic and life-threatening human infections. Methicillin-resistant S. aureus (MRSA) are multidrug-resistant strains, and the ability of forming a biofilm reduces their sensitivity to antibiotics. Thus, the alternative compounds inhibiting both resistant strains and biofilm formation are in high demand. In our study, the strain FJKB0103 was isolated from the rhizosphere of Garcinia mangostana, showing strong anti-MRSA activity. We performed molecular phylogenic analysis, analyzed average nucleotide identity (ANI), in silico DNA-DNA hybridization (isDDH), and biochemical characteristics to identify strain FJKB0103 as Pseudomonas protegens. Herein, the genome of strain FJKB0103 was sequenced and subjected to antiSMASH platform, mutational, and functional analyses. The FJKB0103 draft genome was 6,776,967 bp with a 63.4% G + C content, and 16 potential secondary compound biosynthetic clusters in P. protegens FJKB0103 were predicted. The deletion mutant and complementary analysis suggested that DAPG was the anti-MRSA compound. Further tests showed that MRSA strains were sensitive to DAPG, and the lysis of bacterial cells was observed at a high concentration of DAPG. Additionally, DAPG inhibited the biofilm formation of MRSA at subinhibitory concentration. These results suggested that DAPG might be a good alternative treatment to control infections caused by MRSA.
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Yue H, Miller AL, Khetrapal V, Jayaseker V, Wright S, Du L. Biosynthesis, regulation, and engineering of natural products from Lysobacter. Nat Prod Rep 2022; 39:842-874. [PMID: 35067688 DOI: 10.1039/d1np00063b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Covering: up to August 2021Lysobacter is a genus of Gram-negative bacteria that was classified in 1987. Several Lysobacter species are emerging as new biocontrol agents for crop protection in agriculture. Lysobacter are prolific producers of new bioactive natural products that are largely underexplored. So far, several classes of structurally interesting and biologically active natural products have been isolated from Lysobacter. This article reviews the progress in Lysobacter natural product research over the past ten years, including molecular mechanisms for biosynthesis, regulation and mode of action, genome mining of cryptic biosynthetic gene clusters, and metabolic engineering using synthetic biology tools.
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Affiliation(s)
- Huan Yue
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
| | - Amanda Lynn Miller
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
| | - Vimmy Khetrapal
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
| | - Vishakha Jayaseker
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
| | - Stephen Wright
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
| | - Liangcheng Du
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
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7
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Traykovska M, Popova KB, Penchovsky R. Targeting glmS Ribozyme with Chimeric Antisense Oligonucleotides for Antibacterial Drug Development. ACS Synth Biol 2021; 10:3167-3176. [PMID: 34734706 DOI: 10.1021/acssynbio.1c00443] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Due to the steady rise of multidrug-resistant pathogenic bacteria worldwide, it is critical to develop novel antibacterial drugs. This article presents chimeric antisense oligonucleotides that inhibit the bacterial growth of Staphylococcus aureus, one of the most frequent causes of hospital-acquired infections. The chimeric antisense oligonucleotides have a combination of first- and second-generation chemical modification. To deliver the antisense oligonucleotides into a cell, we apply a cell-penetrating oligopeptide attached to them. We have performed complete bioinformatics analyses of the glmS ribozyme present in S. aureus and its essential role in the biochemical pathway of glucosamine-6-phosphate synthesis. Besides, we have analyzed the bacteria for alternative metabolic pathways, such as the nagA gene. The first antisense oligonucleotide explicitly targets the glmS riboswitch, while the second explicitly targets the nagA mRNA. We have evaluated that combined, the antisense oligonucleotides block the synthesis of glucosamine-6-phosphate entirely and inhibit the bacterial growth of S. aureus. However, the glmS riboswitch targeting the antisense oligonucleotide is sufficient to inhibit the growth of S. aureus with a MIC80 of 5 μg/mL. The glmS ribozyme is a very suitable target for antibacterial drug development with antisense oligonucleotides.
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Affiliation(s)
- Martina Traykovska
- Department of Genetics, Faculty of Biology, Sofia University “St. Kliment Ohridski”, 8 Dragan Tzankov Boulevard, 1164 Sofia, Bulgaria
| | - Katya B. Popova
- Department of Genetics, Faculty of Biology, Sofia University “St. Kliment Ohridski”, 8 Dragan Tzankov Boulevard, 1164 Sofia, Bulgaria
| | - Robert Penchovsky
- Department of Genetics, Faculty of Biology, Sofia University “St. Kliment Ohridski”, 8 Dragan Tzankov Boulevard, 1164 Sofia, Bulgaria
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Yang M, Ren S, Shen D, Yang N, Wang B, Han S, Shen X, Chou SH, Qian G. An intrinsic mechanism for coordinated production of the contact-dependent and contact-independent weapon systems in a soil bacterium. PLoS Pathog 2020; 16:e1008967. [PMID: 33035267 PMCID: PMC7577485 DOI: 10.1371/journal.ppat.1008967] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 10/21/2020] [Accepted: 09/07/2020] [Indexed: 11/29/2022] Open
Abstract
Soil bacteria possess multiple weapons to fend off microbial competitors. Currently, we poorly understand the factors guiding bacterial decisions about weapon systems deployment. In this study, we investigated how such decisions are made by the soil bacterium Lysobacter enzymogenes, used in antifungal plant protection. We found that weapons production is guided by environmental cues. In rich media, which likely mimic environments crowded with other microbes, L. enzymogenes produces a contact-dependent weapon, type six secretion system (T6SS). In nutrient-poor media, likely dominated by filamentous oomycetes and fungi, L. enzymogenes synthesizes and secretes a heat-stable antifungal factor (HSAF), a contact-independent weapon. Surprisingly, the T6SS inner tube protein Hcp is accumulated intracellularly even in nutrient-poor media, when the T6SS is not assembled. We found that Hcp interacts with the transcription factor Clp required for activating HSAF biosynthesis operon expression. Hcp protects Clp from binding to c-di-GMP, an intracellular second messenger inhibiting DNA binding. The increased concentration of c-di-GMP-free Clp thus leads to higher gene expression and HSAF production. Therefore, when the contact-dependent weapon, T6SS, is not in use, accumulation of one of its structural components, Hcp, serves as a signal to enhance production of the contact-independent weapon, HSAF. The uncovered environment-dependent and auto-regulatory mechanisms shed light on the processes governing deployment of various weapon systems in environmental bacteria. Soil bacteria face competition from diverse microbial species. To stay competitive, they deploy a variety of weapons. At present, we know little about factors influencing decisions about which weapons to produce at any given time, and about mechanisms through which these decisions are carried out. In this study, we show that in the soil bacterium, Lysobacter enzymogenes, synthesis of the contact-dependent weapon, known as type six secretion system (T6SS) occurs under different conditions, compared to those conductive to the production of the contact-independent weapon, toxin HSAF. Further, when T6SS is not assembled, one of its structural components, Hcp, coactivates HSAF operon expression and HSAF synthesis. This study reveals that decisions about contact-dependent and contact-independent weapon production in bacteria are governed by both environmental cues and intrinsic coordination mechanisms.
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Affiliation(s)
- Mingming Yang
- College of Plant Protection (Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests), Nanjing Agricultural University, Nanjing, P.R. China
| | - Shuangshuang Ren
- College of Plant Protection (Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests), Nanjing Agricultural University, Nanjing, P.R. China
| | - Danyu Shen
- College of Plant Protection (Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests), Nanjing Agricultural University, Nanjing, P.R. China
| | - Nianda Yang
- College of Plant Protection (Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests), Nanjing Agricultural University, Nanjing, P.R. China
| | - Bingxin Wang
- College of Plant Protection (Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests), Nanjing Agricultural University, Nanjing, P.R. China
| | - Sen Han
- College of Plant Protection (Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests), Nanjing Agricultural University, Nanjing, P.R. China
| | - Xi Shen
- College of Plant Protection (Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests), Nanjing Agricultural University, Nanjing, P.R. China
| | - Shan-Ho Chou
- Institute of Biochemistry, and NCHU Agricultural Biotechnology Center, National Chung Hsing University, Taichung, ROC, Taiwan
| | - Guoliang Qian
- College of Plant Protection (Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests), Nanjing Agricultural University, Nanjing, P.R. China
- * E-mail:
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9
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Yu L, Du F, Chen X, Zheng Y, Morton M, Liu F, Du L. Identification of the Biosynthetic Gene Cluster for the anti-MRSA Lysocins through Gene Cluster Activation Using Strong Promoters of Housekeeping Genes and Production of New Analogs in Lysobacter sp. 3655. ACS Synth Biol 2020; 9:1989-1997. [PMID: 32610008 DOI: 10.1021/acssynbio.0c00067] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Gram-negative gliding bacteria Lysobacter represent a new and rich source for bioactive natural products. In an effort to discover new antibiotics, we found a cryptic biosynthetic gene cluster (BGC) in Lysobacter sp. 3655 that shared a high similarity with the putative lysocin BGC identified in silico previously from Lysobacter sp. RH2180-5. Lysocins are cyclic lipodepsipeptides with potent activity against MRSA (methicillin-resistant Staphylococcus aureus) using a novel mode of action, but the lysocin BGC had not been experimentally verified so far. Using an activity-guided screening, we isolated the main antibiotic compound and confirmed it to be lysocin E. However, the putative lysocin BGC was barely transcribed in the wild type, in which lysocins were produced only in specific conditions and in a negligible amount. To activate the putative lysocin BGC, we screened for strongly transcribed housekeeping genes in strain 3655 and found several powerful promoters. Upon engineering the promoters into the BGC, the lysocin gene transcription was significantly enhanced and the lysocin yield was markedly increased. With readily detectable lysocins production in the engineered strains, we showed that lysocin production was abolished in the gene deletion mutant and then restored in the complementary strain, even when grown in conditions that did not support the wild type for lysocin production. Moreover, the engineered strain produced multiple new lysocin congeners. The determination of the lysocin BGC and the Lysobacter promoters will facilitate the ongoing efforts for yield improvement and new antibiotic biosynthesis using synthetic biology strategies.
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Affiliation(s)
- Lingjun Yu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Fengyu Du
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
- College of Chemistry and Pharmacy, Qingdao Agricultural University, Qingdao, 266109, China
| | - Xusheng Chen
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
- School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Yongbiao Zheng
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
- College of Life Sciences, Fujian Normal University, Fuzhou, 350117, China
| | - Martha Morton
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Fengquan Liu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Liangcheng Du
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
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10
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Chen D, Tian L, Po KHL, Chen S, Li X. Total synthesis and a systematic structure-activity relationship study of WAP-8294A2. Bioorg Med Chem 2020; 28:115677. [PMID: 32828420 DOI: 10.1016/j.bmc.2020.115677] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/21/2020] [Accepted: 07/26/2020] [Indexed: 02/07/2023]
Abstract
WAP-8294A2 is a cyclic peptide antibiotic with novel structure and excellent activity against Gram-positive pathogens. Herein, we report the total synthesis of complex macrocyclic peptide WAP-8294A2 (W1), ent-analogue W2, deoxy analogue W3 and de-methyl analogue W4 using a solid-phase synthetic route followed by a final stage solution-phase cyclization reaction. Exploitation of this process allowed the synthesis of eleven alanine-scanning analogues and eight lysine-scanning analogues. The antimicrobial activity of these analogues was evaluated in vitro against Gram-positive bacteria. Based on the MIC results, a primary systematic structure-activity relationship has been established.
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Affiliation(s)
- Delin Chen
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Liwen Tian
- Department of Chemistry, The University of Hong Kong, Hong Kong, China
| | - Kathy Hiu Laam Po
- Department of Infectious Diseases and Public Health, The City University of Hong Kong, PR China
| | - Sheng Chen
- Department of Infectious Diseases and Public Health, The City University of Hong Kong, PR China
| | - Xuechen Li
- Department of Chemistry, The University of Hong Kong, Hong Kong, China.
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11
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Yu R, Wang J, So LY, Harvey PJ, Shi J, Liang J, Dou Q, Li X, Yan X, Huang YH, Xu Q, Kaas Q, Chow HY, Wong KY, Craik DJ, Zhang XH, Jiang T, Wang Y. Enhanced Activity against Multidrug-Resistant Bacteria through Coapplication of an Analogue of Tachyplesin I and an Inhibitor of the QseC/B Signaling Pathway. J Med Chem 2020; 63:3475-3484. [PMID: 32003561 DOI: 10.1021/acs.jmedchem.9b01563] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Tachyplesin I (TPI) is a cationic β-hairpin antimicrobial peptide with broad-spectrum, potent antimicrobial activity. In this study, the all d-amino acid analogue of TPI (TPAD) was synthesized, and its structure and activity were determined. TPAD has comparable antibacterial activity to TPI on 14 bacterial strains, including four drug-resistant bacteria. Importantly, TPAD has significantly improved stability against enzymatic degradation and decreased hemolytic activity compared to TPI, indicating that it has better therapeutic potential. The induction of bacterial resistance using low concentrations of TPAD resulted in the activation of the QseC/B two-component system. Deletion of this system resulted in at least five-fold improvement of TPAD activity, and the combined use of TPAD with LED209, a QseC/B inhibitor, significantly enhanced the bactericidal effect against three classes of multidrug-resistant bacteria.
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Affiliation(s)
- Rilei Yu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
| | - Jiayi Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Lok-Yan So
- Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong
| | - Peta J Harvey
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Juan Shi
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
| | - Jiazhen Liang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
| | - Qin Dou
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Xiao Li
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
| | - Xiayi Yan
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Yen-Hua Huang
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Qingliang Xu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
| | - Quentin Kaas
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ho-Yin Chow
- Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong
| | - Kwok-Yin Wong
- Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong
| | - David J Craik
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Xiao-Hua Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Tao Jiang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
| | - Yan Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
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12
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Interspecies and Intraspecies Signals Synergistically Regulate Lysobacter enzymogenes Twitching Motility. Appl Environ Microbiol 2019; 85:AEM.01742-19. [PMID: 31540995 DOI: 10.1128/aem.01742-19] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 09/18/2019] [Indexed: 12/24/2022] Open
Abstract
The twitching motility of bacteria is closely related to environmental adaptability and pathogenic behaviors. Lysobacter is a good genus in which to study twitching motility because of the complex social activities and distinct movement patterns of its members. Regardless, the mechanism that induces twitching motility is largely unknown. In this study, we found that the interspecies signal indole caused Lysobacter to have irregular, random twitching motility with significantly enhanced speed. Deletion of qseC or qseB from the two-component system for indole signaling perception resulted in the disappearance of rapid, random movements and significantly decreased twitching activity. Indole-induced, rapid, random twitching was achieved through upregulation of expression of gene cluster pilE1-pilY11-pilX1-pilW1-pilV1-fimT1 In addition, under conditions of extremely low bacterial density, individual Lysobacter cells grew and divided in a stable manner in situ without any movement. The intraspecies quorum-sensing signaling factor 13-methyltetradecanoic acid, designated L. enzymogenes diffusible signaling factor (LeDSF), was essential for Lysobacter to produce twitching motility through indirect regulation of gene clusters pilM-pilN-pilO-pilP-pilQ and pilS1-pilR-pilA-pilB-pilC These results demonstrate that the motility of Lysobacter is induced and regulated by indole and LeDSF, which reveals a novel theory for future studies of the mechanisms of bacterial twitching activities.IMPORTANCE The mechanism underlying bacterial twitching motility is an important research area because it is closely related to social and pathogenic behaviors. The mechanism mediating cell-to-cell perception of twitching motility is largely unknown. Using Lysobacter as a model, we found in this study that the interspecies signal indole caused Lysobacter to exhibit irregular, random twitching motility via activation of gene cluster pilE1-pilY11-pilX1-pilW1-pilV1-fimT1 In addition, population-dependent behavior induced by 13-methyltetradecanoic acid, a quorum-sensing signaling molecule designated LeDSF, was involved in twitching motility by indirectly regulating gene clusters pilM-pilN-pilO-pilP-pilQ and pilS1-pilR-pilA-pilB-pilC The results demonstrate that the twitching motility of Lysobacter is regulated by these two signaling molecules, offering novel clues for exploring the mechanisms of twitching motility and population-dependent behaviors of bacteria.
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13
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Chen X, Li S, Yu L, Miller A, Du L. Systematic optimization for production of the anti-MRSA antibiotics WAP-8294A in an engineered strain of Lysobacter enzymogenes. Microb Biotechnol 2019; 12:1430-1440. [PMID: 31520522 PMCID: PMC6801147 DOI: 10.1111/1751-7915.13484] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 08/02/2019] [Accepted: 08/13/2019] [Indexed: 01/15/2023] Open
Abstract
WAP-8294A is a group of cyclic lipodepsipeptides and considered as the first-in-class new chemical entity with potent activity against methicillin-resistant Staphylococcus aureus. One of the roadblocks in developing the WAP-8294A antibiotics is the very low yield in Lysobacter. Here, we carried out a systematic investigation of the nutritional and environmental conditions in an engineered L. enzymogenes strain for the optimal production of WAP-8294A. We developed an activity-based simple method for quick screening of various factors, which enabled us to optimize the culture conditions. With the method, we were able to improve the WAP-8294A yield by 10-fold in small-scale cultures and approximately 15-fold in scale-up fermentation. Additionally, we found the ratio of WAP-8294A2 to WAP-8294A1 in the strains could be manipulated through medium optimization. The development of a practical method for yield improvement in Lysobacter will facilitate the ongoing basic research and clinical studies to develop WAP-8294A into true therapeutics.
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Affiliation(s)
- Xusheng Chen
- Department of BiotechnologyJiangnan UniversityWuxiJiangsu214122China
- Department of ChemistryUniversity of Nebraska‐LincolnLincolnNE68588USA
| | - Shanren Li
- Department of ChemistryUniversity of Nebraska‐LincolnLincolnNE68588USA
| | - Lingjun Yu
- Department of ChemistryUniversity of Nebraska‐LincolnLincolnNE68588USA
| | - Amanda Miller
- Department of ChemistryUniversity of Nebraska‐LincolnLincolnNE68588USA
| | - Liangcheng Du
- Department of ChemistryUniversity of Nebraska‐LincolnLincolnNE68588USA
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14
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Ling J, Zhu R, Laborda P, Jiang T, Jia Y, Zhao Y, Liu F. LbDSF, the Lysobacter brunescens Quorum-Sensing System Diffusible Signaling Factor, Regulates Anti- Xanthomonas XSAC Biosynthesis, Colony Morphology, and Surface Motility. Front Microbiol 2019; 10:1230. [PMID: 31275253 PMCID: PMC6591275 DOI: 10.3389/fmicb.2019.01230] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 05/17/2019] [Indexed: 01/26/2023] Open
Abstract
Lysobacter species are emerging as novel sources of antibiotics, but the regulation of these antibiotics has not been thoroughly elucidated to date. In this work, we identified a small diffusible signaling factor (DSF) molecule (LbDSF) that regulates the biosynthesis of a novel Xanthomonas-specific antibiotic compound (XSAC) in Lysobacter brunescens OH23. LbDSF was isolated from the culture broth of L. brunescens OH23, and the chemical structure of the molecule was determined by NMR and MS. The LbDSF compound induced GUS expression in a reporter strain of Xanthomonas campestris pv. campestris FE58, which contained the gus gene under the control of a DSF-inducible engXCA promoter. LbDSF production was found to be linked to the enoyl-CoA hydratase RpfF and dependent on the two-component regulatory system RpfC (hybrid sensor histidine kinase)/RpfG (response regulator), and LbDSF production was increased 6.72 times in the ΔrpfC compared to wild-type OH23. LbDSF-regulated XSAC production was dramatically decreased in ΔrpfF, ΔrpfC, and ΔrpfG. Additionally, a significant reduction in surface motility and a number of changes in colony morphology was observed in the ΔrpfF, ΔrpfC, and ΔrpfG compared to the wild-type OH23. The exogenous LbDSF significantly increased XSAC production in wild-type OH23 and recovered the XSAC biosynthetic ability in ΔrpfF. Taken together, these results showed that LbDSF is a fatty-acid-derived DSF that positively regulates XSAC biosynthesis, cell morphology, and surface motility. Moreover, the RpfC/RpfG quorum-sensing signal transduction pathway mediates XSAC biosynthesis. These findings may facilitate antibiotic production through genetic engineering in Lysobacter spp.
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Affiliation(s)
- Jun Ling
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing, China
| | - Runjie Zhu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing, China
| | - Pedro Laborda
- School of Life Sciences, Nantong University, Nantong, China
| | - Tianping Jiang
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing, China
| | - Yifan Jia
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing, China
| | - Yangyang Zhao
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing, China
| | - Fengquan Liu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Nanjing, China.,Institute of Life Sciences, Jiangsu University, Zhenjiang, China
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15
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Abstract
Bacterial antibiotic resistance modulation by small signaling molecules is an emerging mechanism that has been increasingly reported in recent years. Several studies indicate that indole, an interkingdom signaling molecule, increases bacterial antibiotic resistance. However, the mechanism through which indole reduces antibiotic resistance is largely unknown. In this study, we demonstrated a novel mechanism for indole-mediated reversal of intrinsic antibiotic resistance in Lysobacter This reversal was facilitated by a novel BtuD-associated dual-function importer that can transfer both vitamin B12 and antibiotics. Indole stimulated btuD overexpression and promoted efficient absorption of extracellular vitamin B12; meanwhile, the weak selectivity of the importer caused cells to take up excessive doses of antibiotics that resulted in cell death. Consistently, btuD deletion and G48Y/K49D substitution led to marked reductions in the uptake of both antibiotics and vitamin B12 This novel mechanism is common across multiple bacterial species, among which the Q-loop amino acid of BtuD proteins is Glu (E) instead of Gln (Q). Interestingly, the antibiotic resistance of Lysobacter spp. can be restored by another small quorum sensing signaling factor, 13-methyltetradecanoic acid, designated LeDSF, in response to bacterial population density. This work highlights the mechanisms underlying dynamic regulation of bacterial antibiotic resistance by small signaling molecules and suggests that the effectiveness of traditional antibiotics could be increased by coupling them with appropriate signaling molecules.IMPORTANCE Recently, signaling molecules were found to play a role in mediating antibiotic resistance. In this study, we demonstrated that indole reversed the intrinsic antibiotic resistance (IRAR) of multiple bacterial species by promoting the expression of a novel dual-function importer. In addition, population-dependent behavior induced by 13-methyltetradecanoic acid, a quorum sensing signal molecule designated LeDSF, was involved in the IRAR process. This study highlights the dynamic regulation of bacterial antibiotic resistance by small signaling molecules and provides direction for new therapeutic strategies using traditional antibiotics in combination with signaling molecules.
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16
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Laborda P, Ling J, Chen X, Liu F. ACC Deaminase from Lysobacter gummosus OH17 Can Promote Root Growth in Oryza sativa Nipponbare Plants. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:3675-3682. [PMID: 29578708 DOI: 10.1021/acs.jafc.8b00063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Although Lysobacter species are a remarkable source of natural compounds with antibacterial and antifungal activities, the ability of these bacteria to produce plant growth promoters remains practically unknown. In this work, the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) has been isolated from the secretions of Lysobacter gummosus OH17, indicating the presence of an ACC deaminase, which was shown to be encoded in the gene peg_1256. The recombinant enzyme could not only deaminate ACC to provide 2-oxobutanoic acid but also catalyzed the amination of the 2-oxobutanoic acid, demonstrating, for the first time, that ACC deaminases can produce ACC. After the treatment of rice Oryza sativa Nipponbare plants with OH17 ACC deaminase, the ethylene production levels were 44% higher in comparison with the control experiments, allowing significant improvements in root, 10%, and stem, 14%, growth.
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Affiliation(s)
- Pedro Laborda
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences , Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology , Nanjing 210014 , Peoples Republic of China
| | - Jun Ling
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences , Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology , Nanjing 210014 , Peoples Republic of China
| | - Xian Chen
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences , Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology , Nanjing 210014 , Peoples Republic of China
| | - Fengquan Liu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences , Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology , Nanjing 210014 , Peoples Republic of China
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17
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Yu L, Su W, Fey PD, Liu F, Du L. Yield Improvement of the Anti-MRSA Antibiotics WAP-8294A by CRISPR/dCas9 Combined with Refactoring Self-Protection Genes in Lysobacter enzymogenes OH11. ACS Synth Biol 2018; 7:258-266. [PMID: 29125739 DOI: 10.1021/acssynbio.7b00293] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The cyclic lipodepsipeptides WAP-8294A are antibiotics with potent activity against methicillin-resistant Staphylococcus aureus (MRSA). One member of this family, WAP-8294A2 (Lotilibcin), was in clinical trials due to its high activity and distinct chemistry. However, WAP-8294A compounds are produced in a very low yield by Lysobacter and only under very stringent conditions. Improving WAP-8294A yield has become very critical for research and application of these anti-MRSA compounds. Here, we report a strategy to increase WAP-8294A production. We first used the CRISPR/dCas9 system to increase the expression of five cotranscribed genes (orf1-5) in the WAP gene cluster, by fusing the omega subunit of RNA polymerase with dCas9 that targets the operon's promoter region. This led to the transcription of the genes increased by 5-48 folds in strain dCas9-ω3. We then refactored four putative self-protection genes (orf6, orf7, orf9 and orf10) by reorganizing them into an operon under the control of a strong Lysobacter promoter, PHSAF. The refactored operon was introduced into strain dCas9-ω3, and the transcription of the self-protection genes increased by 20-60 folds in the resultant engineered strains. The yield of the three main WAP-8294A compounds, WAP-8294A1, WAP-8294A2, and WAP-8294A4, increased by 6, 4, and 9 folds, respectively, in the engineered strains. The data also showed that the yield increase of WAP-8294A compounds was mainly due to the increase of the extracellular distribution. WAP-8294A2 exhibited potent (MIC 0.2-0.8 μg/mL) and specific activity against S. aureus among a battery of clinically relevant Gram-positive pathogens (54 isolates).
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Affiliation(s)
- Lingjun Yu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
- Department of Chemistry, University of Nebraska−Lincoln, Lincoln, Nebraska 68588, United States
| | - Wei Su
- Department of Chemistry, University of Nebraska−Lincoln, Lincoln, Nebraska 68588, United States
| | - Paul D. Fey
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Fengquan Liu
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Liangcheng Du
- Department of Chemistry, University of Nebraska−Lincoln, Lincoln, Nebraska 68588, United States
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18
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Itoh H, Tokumoto K, Kaji T, Paudel A, Panthee S, Hamamoto H, Sekimizu K, Inoue M. Total Synthesis and Biological Mode of Action of WAP-8294A2: A Menaquinone-Targeting Antibiotic. J Org Chem 2017; 83:6924-6935. [PMID: 29019678 DOI: 10.1021/acs.joc.7b02318] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
WAP-8294A2 (lotilibcin, 1) is a potent antibiotic with superior in vivo efficacy to vancomycin against methicillin-resistant Staphylococcus aureus (MRSA). Despite the great medical importance, its molecular mode of action remains unknown. Here we report the total synthesis of complex macrocyclic peptide 1 comprised of 12 amino acids with a β-hydroxy fatty-acid chain, and its deoxy analogue 2. A full solid-phase synthesis of 1 and 2 enabled their rapid assembly and the first detailed investigation of their functions. Compounds 1 and 2 were equipotent against various strains of Gram-positive bacteria including MRSA. We present evidence that the antimicrobial activities of 1 and 2 are due to lysis of the bacterial membrane, and their membrane-disrupting effects depend on the presence of menaquinone, an essential factor for the bacterial respiratory chain. The established synthetic routes and the menaquinone-targeting mechanisms provide valuable information for designing and developing new antibiotics based on their structures.
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Affiliation(s)
- Hiroaki Itoh
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan
| | - Kotaro Tokumoto
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan
| | - Takuya Kaji
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan
| | - Atmika Paudel
- Teikyo University Institute of Medical Mycology , 359 Otsuka , Hachioji , Tokyo 192-0395 , Japan
| | - Suresh Panthee
- Teikyo University Institute of Medical Mycology , 359 Otsuka , Hachioji , Tokyo 192-0395 , Japan
| | - Hiroshi Hamamoto
- Teikyo University Institute of Medical Mycology , 359 Otsuka , Hachioji , Tokyo 192-0395 , Japan
| | - Kazuhisa Sekimizu
- Teikyo University Institute of Medical Mycology , 359 Otsuka , Hachioji , Tokyo 192-0395 , Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan
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19
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Li S, Wu X, Zhang L, Shen Y, Du L. Activation of a Cryptic Gene Cluster in Lysobacter enzymogenes Reveals a Module/Domain Portable Mechanism of Nonribosomal Peptide Synthetases in the Biosynthesis of Pyrrolopyrazines. Org Lett 2017; 19:5010-5013. [PMID: 28898095 DOI: 10.1021/acs.orglett.7b01611] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Lysobacter are considered "peptide specialists". However, many of the nonribosomal peptide synthetase genes are silent. Three new compounds were identified from L. enzymogenes upon activating the six-module-containing led cluster by the strong promoter PHSAF. Although ledD was the first gene under PHSAF control, the second gene ledE was expressed the highest. Targeted gene inactivation showed that the two-module LedE and the one-module LedF were selectively used in pyrrolopyrazine biosynthesis, revealing a module/domain portable mechanism.
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Affiliation(s)
- Shanren Li
- State Key Laboratory of Microbial Technology, College of Life Sciences, Shandong University , Jinan 250100, China
| | - Xiuli Wu
- College of Pharmacy, Ningxia Medical University , Yinchuan 750004, China
| | | | - Yuemao Shen
- State Key Laboratory of Microbial Technology, College of Life Sciences, Shandong University , Jinan 250100, China
| | - Liangcheng Du
- State Key Laboratory of Microbial Technology, College of Life Sciences, Shandong University , Jinan 250100, China
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20
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Gaylarde C, Baptista-Neto JA, Ogawa A, Kowalski M, Celikkol-Aydin S, Beech I. Epilithic and endolithic microorganisms and deterioration on stone church facades subject to urban pollution in a sub-tropical climate. BIOFOULING 2017; 33:113-127. [PMID: 28054493 DOI: 10.1080/08927014.2016.1269893] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 12/04/2016] [Indexed: 06/06/2023]
Abstract
Weathering of two church facades in Rio de Janeiro was caused substantially by salts, mainly halite and gypsum, detected by SEM and chemical analyses, which cause physical stresses by deposition within the rock. Biofilm populations, determined by SEM and as operational taxonomic units (OTUs), degraded stone by penetration, solubilization and redeposition of minerals on their surfaces. Endolithic cyanobacteria were associated with gypsum deposits. Microbiomes were typical for high-stress environments, high salt, intense insolation, low water and low nutrients (eg halophilic Rubrobacter, Salinicola, Sterigmatomyces). The main colonizers on the church most affected by traffic (Nossa Senhora da Candelária - CA) were Actinobacteria; Gammaproteobacteria (chiefly Pseudomonas) were predominant on the site situated in a leafy square (São Francisco de Paula - SF). Major Gammaproteobacteria on CA were halophilic Halomonas and Rhodobacteriaceae. Fungal OTUs on both churches were principally dimorphic, yeast-like basidiomycetes. Many OTUs of thermophilic microorganisms (eg the Thermomicrobia class, Chloroflexi) were present. This is the first use of next generation sequencing (NGS) to study microbial biofilm interactions with metamorphic and granite buildings in an intensely urban, sub-tropical climate.
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Affiliation(s)
- Christine Gaylarde
- a Department of Microbiology and Plant Biology, University of Oklahoma , Norman , OK , USA
| | | | - Akiko Ogawa
- a Department of Microbiology and Plant Biology, University of Oklahoma , Norman , OK , USA
| | - Matthew Kowalski
- a Department of Microbiology and Plant Biology, University of Oklahoma , Norman , OK , USA
| | - Sukriye Celikkol-Aydin
- a Department of Microbiology and Plant Biology, University of Oklahoma , Norman , OK , USA
| | - Iwona Beech
- a Department of Microbiology and Plant Biology, University of Oklahoma , Norman , OK , USA
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21
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Marine Microbiological Enzymes: Studies with Multiple Strategies and Prospects. Mar Drugs 2016; 14:md14100171. [PMID: 27669268 PMCID: PMC5082319 DOI: 10.3390/md14100171] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/04/2016] [Accepted: 09/14/2016] [Indexed: 11/16/2022] Open
Abstract
Marine microorganisms produce a series of promising enzymes that have been widely used or are potentially valuable for our daily life. Both classic and newly developed biochemistry technologies have been broadly used to study marine and terrestrial microbiological enzymes. In this brief review, we provide a research update and prospects regarding regulatory mechanisms and related strategies of acyl-homoserine lactones (AHL) lactonase, which is an important but largely unexplored enzyme. We also detail the status and catalytic mechanism of the main types of polysaccharide-degrading enzymes that broadly exist among marine microorganisms but have been poorly explored. In order to facilitate understanding, the regulatory and synthetic biology strategies of terrestrial microorganisms are also mentioned in comparison. We anticipate that this review will provide an outline of multiple strategies for promising marine microbial enzymes and open new avenues for the exploration, engineering and application of various enzymes.
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22
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Panthee S, Hamamoto H, Paudel A, Sekimizu K. Lysobacter species: a potential source of novel antibiotics. Arch Microbiol 2016; 198:839-45. [PMID: 27541998 DOI: 10.1007/s00203-016-1278-5] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 08/03/2016] [Accepted: 08/10/2016] [Indexed: 11/28/2022]
Abstract
Infectious diseases threaten global health due to the ability of microbes to acquire resistance against clinically used antibiotics. Continuous discovery of antibiotics with a novel mode of action is thus required. Actinomycetes and fungi are currently the major sources of antibiotics, but the decreasing rate of discovery of novel antibiotics suggests that the focus should be changed to previously untapped groups of microbes. Lysobacter species have a genome size of ~6 Mb with a relatively high G + C content of 61-70 % and are characterized by their ability to produce peptides that damage the cell walls or membranes of other microbes. Genome sequence analysis revealed that each Lysobacter species has gene clusters for the production of 12-16 secondary metabolites, most of which are peptides, thus making them 'peptide production specialists'. Given that the number of antibiotics isolated is much lower than the number of gene clusters harbored, further intensive studies of Lysobacter are likely to unearth novel antibiotics with profound biomedical applications. In this review, we summarize the structural diversity, activity and biosynthesis of lysobacterial antibiotics and highlight the importance of Lysobacter species for antibiotic production.
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Affiliation(s)
- Suresh Panthee
- Teikyo University Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan.,Laboratory of Microbiology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Hiroshi Hamamoto
- Teikyo University Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan.,Laboratory of Microbiology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Atmika Paudel
- Teikyo University Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan.,Laboratory of Microbiology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Kazuhisa Sekimizu
- Teikyo University Institute of Medical Mycology, 359 Otsuka, Hachioji, Tokyo, 192-0395, Japan. .,Laboratory of Microbiology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan. .,Genome Pharmaceutical Institute Co., Ltd., 1-27-8-1207 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
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23
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Chen H, Olson AS, Su W, Dussault PH, Du L. Fatty Acyl Incorporation in the Biosynthesis of WAP-8294A, a Group of Potent Anti-MRSA Cyclic Lipodepsipeptides. RSC Adv 2015; 5:105753-105759. [PMID: 26726302 DOI: 10.1039/c5ra20784c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
WAP-8294A is a family of at least 20 cyclic lipodepsipeptides exhibiting potent anti-MRSA activity. These compounds differ mainly in the hydroxylated fatty acyl chain; WAP-8294A2, the most potent member of the family that reached clinical trials, is based on (R)-3-hydroxy-7-methyloctanoic acid. It is unclear how the acyl group is incorporated because no acyl-CoA ligase (ACL) gene is present in the WAP-8294A gene cluster in Lysobacter enzymogenes OH11. Here, we identified seven putative ACL genes in the OH11 genome and showed that the yield of WAP-8294A2 was impacted by multiple ACL genes with the ACL6 gene having the most significant effect. We then investigated several (R)-3-hydroxy fatty acids and their acyl SNAC (N-acetylcysteamine) thioesters as substrates for the ACLs. Feeding (R)-3-hydroxy-7-methyloctanoate-SNAC to the ACL6 gene deletion mutant restored the production of WAP-8294A2. Finally, we heterologously expressed the seven ACL genes in E. coli and purified six of the proteins. While these enzymes exhibit a varied level of activity in vitro, ACL6 showed the highest catalytic efficiency in converting (R)-3-hydroxy-7-methyloctanoic acid to its CoA thioester when incubated with coenzyme A and ATP. These results provided both in vivo and in vitro evidence to support the fact that ACL6 is the main player for fatty acyl activation and incorporation in WAP-8294A2 biosynthesis. The results also suggest that the molecular basis for the acyl chain diversity in the WAP-8294A family is the presence of functionally overlapping ACLs.
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Affiliation(s)
- Haotong Chen
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588-0304, USA
| | - Andrew S Olson
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588-0304, USA
| | - Wei Su
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588-0304, USA
| | - Patrick H Dussault
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588-0304, USA
| | - Liangcheng Du
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588-0304, USA
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Gómez Expósito R, Postma J, Raaijmakers JM, De Bruijn I. Diversity and Activity of Lysobacter Species from Disease Suppressive Soils. Front Microbiol 2015; 6:1243. [PMID: 26635735 PMCID: PMC4644931 DOI: 10.3389/fmicb.2015.01243] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 10/26/2015] [Indexed: 02/05/2023] Open
Abstract
The genus Lysobacter includes several species that produce a range of extracellular enzymes and other metabolites with activity against bacteria, fungi, oomycetes, and nematodes. Lysobacter species were found to be more abundant in soil suppressive against the fungal root pathogen Rhizoctonia solani, but their actual role in disease suppression is still unclear. Here, the antifungal and plant growth-promoting activities of 18 Lysobacter strains, including 11 strains from Rhizoctonia-suppressive soils, were studied both in vitro and in vivo. Based on 16S rRNA sequencing, the Lysobacter strains from the Rhizoctonia-suppressive soil belonged to the four species Lysobacter antibioticus, Lysobacter capsici, Lysobacter enzymogenes, and Lysobacter gummosus. Most strains showed strong in vitro activity against R. solani and several other pathogens, including Pythium ultimum, Aspergillus niger, Fusarium oxysporum, and Xanthomonas campestris. When the Lysobacter strains were introduced into soil, however, no significant and consistent suppression of R. solani damping-off disease of sugar beet and cauliflower was observed. Subsequent bioassays further revealed that none of the Lysobacter strains was able to promote growth of sugar beet, cauliflower, onion, and Arabidopsis thaliana, either directly or via volatile compounds. The lack of in vivo activity is most likely attributed to poor colonization of the rhizosphere by the introduced Lysobacter strains. In conclusion, our results demonstrated that Lysobacter species have strong antagonistic activities against a range of pathogens, making them an important source for putative new enzymes and antimicrobial compounds. However, their potential role in R. solani disease suppressive soil could not be confirmed. In-depth omics'-based analyses will be needed to shed more light on the potential contribution of Lysobacter species to the collective activities of microbial consortia in disease suppressive soils.
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Affiliation(s)
- Ruth Gómez Expósito
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW) Wageningen, Netherlands ; Laboratory of Phytopathology, Wageningen University and Research Centre Wageningen, Netherlands
| | - Joeke Postma
- Plant Research International, Wageningen University and Research Centre Wageningen, Netherlands
| | - Jos M Raaijmakers
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW) Wageningen, Netherlands
| | - Irene De Bruijn
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW) Wageningen, Netherlands
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Identification of a small molecule signaling factor that regulates the biosynthesis of the antifungal polycyclic tetramate macrolactam HSAF in Lysobacter enzymogenes. Appl Microbiol Biotechnol 2014; 99:801-11. [PMID: 25301587 DOI: 10.1007/s00253-014-6120-x] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 09/23/2014] [Accepted: 09/25/2014] [Indexed: 02/06/2023]
Abstract
Lysobacter species are emerging as new sources of antibiotics. The regulation of these antibiotics is not well understood. Here, we identified a small molecule metabolite (LeDSF3) that regulates the biosynthesis of the antifungal antibiotic heat-stable antifungal factor (HSAF), a polycyclic tetramate macrolactam with a structure and mode of action distinct from the existing antifungal drugs. LeDSF3 was isolated from the culture broth of Lysobacter enzymogenes, and its chemical structure was established by NMR and MS. The purified compound induced green fluorescence in a reporter strain of Xanthomonas campestris, which contained a gfp gene under the control of a diffusible signaling factor (DSF)-inducible promoter. Exogenous addition of LeDSF3 in L. enzymogenes cultures significantly increased the HSAF yield, the transcription of HSAF biosynthetic genes, and the antifungal activity of the organism. The LeDSF3-regulated HSAF production is dependent on the two-component regulatory system RpfC/RpfG. Moreover, LeDSF3 upregulated the expression of the global regulator cAMP receptor-like protein (Clp). The disruption of clp led to no HSAF production. Together, the results show that LeDSF3 is a fatty acid-derived, diffusible signaling factor positively regulating HSAF biosynthesis and that the signaling is mediated by the RfpC/RpfG-Clp pathway. These findings may facilitate the antibiotic production through applied genetics and molecular biotechnology in Lysobacter, a group of ubiquitous yet underexplored microorganisms.
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