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Rational construction of genome-reduced Burkholderiales chassis facilitates efficient heterologous production of natural products from proteobacteria. Nat Commun 2021; 12:4347. [PMID: 34301933 PMCID: PMC8302735 DOI: 10.1038/s41467-021-24645-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 06/29/2021] [Indexed: 02/06/2023] Open
Abstract
Heterologous expression of biosynthetic gene clusters (BGCs) avails yield improvements and mining of natural products, but it is limited by lacking of more efficient Gram-negative chassis. The proteobacterium Schlegelella brevitalea DSM 7029 exhibits potential for heterologous BGC expression, but its cells undergo early autolysis, hindering further applications. Herein, we rationally construct DC and DT series genome-reduced S. brevitalea mutants by sequential deletions of endogenous BGCs and the nonessential genomic regions, respectively. The DC5 to DC7 mutants affect growth, while the DT series mutants show improved growth characteristics with alleviated cell autolysis. The yield improvements of six proteobacterial natural products and successful identification of chitinimides from Chitinimonas koreensis via heterologous expression in DT mutants demonstrate their superiority to wild-type DSM 7029 and two commonly used Gram-negative chassis Escherichia coli and Pseudomonas putida. Our study expands the panel of Gram-negative chassis and facilitates the discovery of natural products by heterologous expression.
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Jasin Mansur F, Takahara S, Yamamoto M, Shimatani M, Minnatul Karim M, Noiri Y, Ebisu S, Azakami H. Purification and characterization of hemolysin from periodontopathogenic bacterium Eikenella corrodens strain 1073. Biosci Biotechnol Biochem 2017; 81:1246-1253. [PMID: 28485212 DOI: 10.1080/09168451.2017.1295807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Eikenella corrodens 1073 was found to show hemolytic activity when grown on sheep blood agar. A high and dose-dependent hemolytic activity was detected in the cell envelope fraction, which was further purified by ion-exchange and gel-filtration chromatography. Consequently, a 65-kDa protein with hemolytic activity was obtained, suggesting that this protein might be a hemolysin. Its N-terminal amino acid sequence was nearly identical to that of X-prolyl aminopeptidase from E. corrodens ATCC 23834. To confirm that X-prolyl aminopeptidase functions as a hemolytic factor, we expressed the hlyA gene, encoding X-prolyl aminopeptidase, in Escherichia coli. After induction with isopropyl β-D-1-thiogalactopyranoside, a protein of about 65 kDa was purified on a Ni column, and its hemolytic activity was confirmed. Meanwhile, a strain with a disrupted hlyA gene, which was constructed by homologous recombination, did not show any hemolytic activity. These results suggested that X-prolyl aminopeptidase might function as a hemolysin in E. corrodens.
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Affiliation(s)
- Fariha Jasin Mansur
- a Faculty of Agriculture, Department of Biological Chemistry , Yamaguchi University , Yamaguchi , Japan
| | - Sari Takahara
- a Faculty of Agriculture, Department of Biological Chemistry , Yamaguchi University , Yamaguchi , Japan
| | - Mihoko Yamamoto
- a Faculty of Agriculture, Department of Biological Chemistry , Yamaguchi University , Yamaguchi , Japan
| | - Masafumi Shimatani
- a Faculty of Agriculture, Department of Biological Chemistry , Yamaguchi University , Yamaguchi , Japan
| | - Mohammad Minnatul Karim
- a Faculty of Agriculture, Department of Biological Chemistry , Yamaguchi University , Yamaguchi , Japan.,b Department of Biotechnology and Genetic Engineering , Islamic University , Kushtia , Bangladesh
| | - Yuichiro Noiri
- c Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science , Niigata University Graduate School of Medical and Dental Sciences , Niigata , Japan
| | - Shigeyuki Ebisu
- d Department of Restorative Dentistry and Endodontology , Osaka University Graduate School of Dentistry , Suita , Japan
| | - Hiroyuki Azakami
- a Faculty of Agriculture, Department of Biological Chemistry , Yamaguchi University , Yamaguchi , Japan
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The Inhibitory Effects of Catechins on Biofilm Formation by the Periodontopathogenic Bacterium,Eikenella corrodens. Biosci Biotechnol Biochem 2014; 74:2445-50. [DOI: 10.1271/bbb.100499] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Azakami H, Nakashima H, Akimichi H, Noiri Y, Ebisu S, Kato A. Involvement ofN-Acetyl-D-galactosamine-specific Lectin in Biofilm Formation by the Periodontopathogenic Bacterium,Eikenella corrodens. Biosci Biotechnol Biochem 2014; 70:441-6. [PMID: 16495661 DOI: 10.1271/bbb.70.441] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Eikenella corrodens is known not only as one of the periodontopathogenic bacteria but also as a pathogen associated with many infectious diseases of humans. Dental plaque is a complex biofilm community comprised of many bacterial species. E. corrodens has a lectin on its cell surface that is thought to be involved in its pathogenicity. In this study, we found that E. corrodens forms a biofilm on a polystyrene surface. A biofilm was formed at the bottom of the wells in microtiter plates after 24 h. Microcolonies were observed as the amount of biofilm became larger. When anaerobic respiration was repressed due to nitrate limitation, the biofilm formed only at the air-water interface. Strain 1073 and HU, which have higher lectin activity, formed a biofilm more effectively than other strains. Biofilm formation was repressed by the addition of N-acetyl-D-galactosamine. These results suggest that the lectin on the surface of E. corrodens might be involved in biofilm formation.
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Affiliation(s)
- Hiroyuki Azakami
- Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Japan.
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Genomic recombination through plasmid-encoded recombinase enhances hemolytic activity and adherence to epithelial cells in the periodontopathogenic bacterium Eikenella corrodens. Biosci Biotechnol Biochem 2011; 75:748-51. [PMID: 21512230 DOI: 10.1271/bbb.100866] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The periodontopathogenic bacterium Eikenella corrodens has an N-acetyl-D-galactosamine (GalNAc)-specific lectin, that contributes significantly to the pathogenicity of the bacterium. Recently, we reported that plasmid-mediated genomic recombination enhances the activity of this lectin. In this study, we investigated the effects of genomic recombination on certain virulence factors. Introduction of the recombinase gene resulted in hemolysis and significantly increased bacterial adhesion to epithelial cells. It was suggested that the enhanced adhesion was attributable to increased lectin activity due to genomic recombination, because it was inhibited by the addition of GalNAc. In contrast, invasion of the epithelial cells was remarkably reduced by genomic recombination. Although we assumed that this decrease in invasion resulted from a loss of type-IV pili, the phase variant did not show any decrease in invasion activity. This suggests that type-IV pili do not contribute to the invasive ability of E. corrodens. Our results suggest that genomic recombination enhances the pathogenicity of E. corrodens.
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Azakami H, Teramura I, Matsunaga T, Akimichi H, Noiri Y, Ebisu S, Kato A. Characterization of autoinducer 2 signal in Eikenella corrodens and its role in biofilm formation. J Biosci Bioeng 2006; 102:110-7. [PMID: 17027872 DOI: 10.1263/jbb.102.110] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2006] [Accepted: 05/16/2006] [Indexed: 11/17/2022]
Abstract
Quorum sensing (QS) is a process by which bacteria communicate using secreted chemical signaling molecules called autoinducers (AIs). By this process, many bacterial species modulate the expression of a wide variety of physiological functions in response to changes in population density. In this study, the periodontal pathogen Eikenella corrodens was observed to secrete type 2 signaling molecules. An ortholog of luxS, the gene required for AI-2 synthesis in Vibrio harveyi, was isolated from the E. corrodens genome. A V. harveyi bioassay showed luxS functionality in E. corrodens and the ability of luxS to complement the luxS-negative phenotype of Escherichia coli DH5alpha. AI activity was detected in the supernatant, and the maximum expression of AI-2 was observed during the late exponential phase. To determine the potential role of luxS in the colonization processes, an E. corrodens luxS mutant was constructed and tested for its capacity to form an in vitro biofilm on a polystyrene surface. The biofilm forming efficiency of the luxS mutant was approximately 1.3-fold greater than that of the wild type. These data suggest that a LuxS-dependent signal plays a role in the biofilm formation by E. corrodens.
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Affiliation(s)
- Hiroyuki Azakami
- Department of Biological Chemistry, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan.
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