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Zhang C, Cheng H, Han Y, Wa Y, Chen D, Guan C, Huang Y, Gu R. Transcriptome-phenotype matching analysis of how nitrogen sources influence Lacticaseibacillus rhamnosus tolerance to heat stress and oxidative stress. Microb Cell Fact 2022; 21:257. [PMID: 36510221 PMCID: PMC9746023 DOI: 10.1186/s12934-022-01985-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 12/06/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Spray drying is the most cost-effective production method for lactic acid bacteria starters, but heat and oxidative stresses result in low survival rates. The heat stress and oxidative stress tolerance of Lacticaseibacillus rhamnosus cultured in tryptone-free MRS (NP-MRS) broth was much stronger than that in MRS or tryptone-free MRS broth supplemented with phenylalanine (Phe-MRS). Here, multiple transcriptome-phenotype matching was performed on cells cultured in NP-MRS, MRS and Phe-MRS broths to reveal the mechanism by which nitrogen sources influence L. rhamnosus tolerance to heat stress and oxidative stress. RESULTS Compared with cells cultured in NP-MRS broth, 83 overlapping differentially expressed genes (DEGs) were downregulated by either tryptone or phenylalanine. The overlapping DEGs were mainly classified into carbohydrate metabolism and membrane transport pathways, which are often repressed by glucose during carbon catabolite repression (CCR). In the presence of glucose, the heat stress or oxidative stress tolerance of L. rhamnosus hsryfm 1301 was not strengthened by supplementation with secondary carbohydrates. Replacing glucose with mannose, fructose or ribose improved the heat stress and oxidative stress tolerance of L. rhamnosus hsryfm 1301 (5 to 46-fold). CONCLUSIONS Alleviation of CCR might be a reason for the resistance of L. rhamnosus hsryfm 1301 to heat stress and oxidative stress in a low-nitrogen environment. The survival rate of L. rhamnosus during spray drying will hopefully be improved by relieving CCR. It is a new discovery that nitrogen sources influence CCR in L. rhamnosus.
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Affiliation(s)
- Chenchen Zhang
- College of Food Science and Engineering, Yangzhou University, 196 Huayang Xilu, Yangzhou, 225100, People's Republic of China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou, People's Republic of China.,Jiangsu Dairy Biotechnology Engineering Research Center, Yangzhou, People's Republic of China
| | - Haohao Cheng
- College of Food Science and Engineering, Yangzhou University, 196 Huayang Xilu, Yangzhou, 225100, People's Republic of China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou, People's Republic of China
| | - Yuemei Han
- College of Food Science and Engineering, Yangzhou University, 196 Huayang Xilu, Yangzhou, 225100, People's Republic of China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou, People's Republic of China
| | - Yunchao Wa
- College of Food Science and Engineering, Yangzhou University, 196 Huayang Xilu, Yangzhou, 225100, People's Republic of China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou, People's Republic of China
| | - Dawei Chen
- College of Food Science and Engineering, Yangzhou University, 196 Huayang Xilu, Yangzhou, 225100, People's Republic of China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou, People's Republic of China
| | - Chengran Guan
- College of Food Science and Engineering, Yangzhou University, 196 Huayang Xilu, Yangzhou, 225100, People's Republic of China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou, People's Republic of China.,Jiangsu Dairy Biotechnology Engineering Research Center, Yangzhou, People's Republic of China
| | - Yujun Huang
- College of Food Science and Engineering, Yangzhou University, 196 Huayang Xilu, Yangzhou, 225100, People's Republic of China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou, People's Republic of China
| | - Ruixia Gu
- College of Food Science and Engineering, Yangzhou University, 196 Huayang Xilu, Yangzhou, 225100, People's Republic of China. .,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou, People's Republic of China.
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Nagarajan D, Chen CY, Ariyadasa TU, Lee DJ, Chang JS. Macroalgal biomass as a potential resource for lactic acid fermentation. CHEMOSPHERE 2022; 309:136694. [PMID: 36206920 DOI: 10.1016/j.chemosphere.2022.136694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/25/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
Lactic acid is an essential platform chemical with various applications in the chemicals, food, pharmaceutical, and cosmetic industries. Currently, the demand for lactic acid is driven by the role of lactic acid as the starting material for the production of bioplastic polylactide. Microbial fermentation for lactic acid production is favored due to the production of enantiomerically pure lactic acid required for polylactide synthesis, as opposed to the racemic mixture obtained via chemical synthesis. The utilization of first-generation feedstock for commercial lactic acid production is challenged by feedstock costs and sustainability issues. Macroalgae are photosynthetic benthic aquatic plants that contribute tremendously towards carbon capture with subsequent carbon-rich biomass production. Macroalgae are commercially cultivated to extract hydrocolloids, and recent studies have focused on applying biomass as a fermentation feedstock. This review provides comprehensive information on the design and development of sustainable and cost-effective, algae-based lactic acid production. The central carbon regulation in lactic acid bacteria and the metabolism of seaweed-derived sugars are described. An exhaustive compilation of lactic acid fermentation of macroalgae hydrolysates revealed that lactic acid bacteria can effectively ferment the mixture of sugars present in the hydrolysate with comparable yields. The environmental impacts and economic prospects of macroalgal lactic acid are analyzed. Valorization of the vast amounts of spent macroalgal biomass residue post hydrocolloid extraction in a biorefinery is a viable strategy for cost-effective lactic acid production.
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Affiliation(s)
- Dillirani Nagarajan
- Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan.
| | - Chun-Yen Chen
- University Center for Bioscience and Biotechnology, National Cheng Kung University, Tainan, Taiwan; Research Center for Circular Economy, National Cheng Kung University, Tainan, Taiwan
| | - Thilini U Ariyadasa
- Department of Chemical and Process Engineering, Faculty of Engineering, University of Moratuwa, Moratuwa, 10400, Sri Lanka
| | - Duu-Jong Lee
- Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tang, Hong Kong
| | - Jo-Shu Chang
- Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan; Department of Chemical and Materials Engineering, Tunghai University, Taichung, 407, Taiwan; Research Center for Smart Sustainable Circular Economy, Tunghai University, Taichung, 407, Taiwan; Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-Li, 32003, Taiwan.
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Wen ZT, Huang X, Ellepola K, Liao S, Li Y. Lactobacilli and human dental caries: more than mechanical retention. MICROBIOLOGY (READING, ENGLAND) 2022; 168. [PMID: 35671222 DOI: 10.1099/mic.0.001196] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Lactobacilli have been considered as major contributors to human dental caries for over a century. Recent in vitro model studies have shown that when compared to Streptococcus mutans, a keystone pathogen of human dental caries, the ability of lactobacilli to form biofilms is poor, although differences exist between the different major species. Further studies using molecular and bioinformatics approaches provide evidence that multiple mechanisms, including adhesin-receptor mediated physical contact with S. mutans, facilitate the adherence and establishment of lactobacilli on the tooth surface. There is also evidence that under conditions like continuous sugar consumption, weak acids and other antimicrobials such as bacteriocins from lactobacilli can become detrimental to the microbial community, especially those in the proximity. Details on the underlying mechanisms of how different Lactobacillus sp. establish and persist in the highly complex microbiota on the tooth surface await further investigation.
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Affiliation(s)
- Zezhang T Wen
- Department of Prosthodontics, School of Dentistry and Department of Microbiology, Immunology and Parasitology, School of Medicine, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Xiaochang Huang
- Department of Prosthodontics, School of Dentistry and Department of Microbiology, Immunology and Parasitology, School of Medicine, Louisiana State University Health Sciences Center, New Orleans, LA, USA.,Present address: Analysis and Testing Center, Nanchang University, 235 Nanjing East Load, Qingshan Lake District, Nanchang, PR China
| | - Kassapa Ellepola
- Department of Prosthodontics, School of Dentistry and Department of Microbiology, Immunology and Parasitology, School of Medicine, Louisiana State University Health Sciences Center, New Orleans, LA, USA.,Present address: Department of Oral Biology, College of Dentistry, University of Illinois Chicago, Chicago, IL, USA
| | - Sumei Liao
- Department of Prosthodontics, School of Dentistry and Department of Microbiology, Immunology and Parasitology, School of Medicine, Louisiana State University Health Sciences Center, New Orleans, LA, USA
| | - Yihong Li
- Department of Public and Ecosystem Health, College of Veterinary Medicine, Cornel University, Ithaca, NY, USA
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Chen C, Wang L, Yu H, Tian H. The local transcriptional regulators SacR1 and SacR2 act as repressors of fructooligosaccharides metabolism in Lactobacillus plantarum. Microb Cell Fact 2020; 19:161. [PMID: 32778113 PMCID: PMC7419226 DOI: 10.1186/s12934-020-01403-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 07/13/2020] [Indexed: 11/25/2022] Open
Abstract
Background In Lactobacillus plantarum, fructooligosaccharides (FOS) metabolism is controlled by both global and local regulatory mechanisms. Although catabolite control protein A has been identified as a global regulator of FOS metabolism, the functions of local regulators remain unclear. This study aimed to elucidate the roles of two local regulators, SacR1 and SacR2, in the regulation of FOS metabolism in L. plantarum both in vitro and in vivo. Results The inactivation of sacR1 and sacR2 affected the growth and production of metabolites for strains grown on FOS or glucose, respectively. A reverse transcription-quantitative PCR analysis of one wild-type and two mutant strains (ΔsacR1 and ΔsacR2) of L. plantarum identified SacR1 and SacR2 as repressors of genes relevant to FOS metabolism in the absence of FOS, and these genes could be induced or derepressed by the addition of FOS. The analysis predicted four potential transcription factor binding sites (TFBSs) in the putative promoter regions of two FOS-related clusters. The binding of SacR1 and SacR2 to these TFBSs both in vitro and in vivo was verified using electrophoretic mobility shift assays and chromatin immunoprecipitation, respectively. A consensus sequence of WNNNNNAACGNNTTNNNNNW was deduced for the TFBSs of SacR1 and SacR2. Conclusion Our results identified SacR1 and SacR2 as local repressors for FOS metabolism in L. plantarum. The regulation is achieved by the binding of SacR1 and SacR2 to TFBSs in the promoter regions of FOS-related clusters. The results provide new insights into the complex network regulating oligosaccharide metabolism by lactic acid bacteria. ![]()
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Affiliation(s)
- Chen Chen
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, 201418, People's Republic of China
| | - Linlin Wang
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, 201418, People's Republic of China
| | - Haiyan Yu
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, 201418, People's Republic of China
| | - Huaixiang Tian
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, 201418, People's Republic of China.
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Collograi KC, da Costa AC, Ienczak JL. Effect of contamination with Lactobacillus fermentum I2 on ethanol production by Spathaspora passalidarum. Appl Microbiol Biotechnol 2019; 103:5039-5050. [DOI: 10.1007/s00253-019-09779-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 02/06/2019] [Accepted: 03/15/2019] [Indexed: 12/23/2022]
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Xin Y, Guo T, Mu Y, Kong J. A Single-Plasmid Genome Editing System for Metabolic Engineering of Lactobacillus casei. Front Microbiol 2018; 9:3024. [PMID: 30568651 PMCID: PMC6289983 DOI: 10.3389/fmicb.2018.03024] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 11/22/2018] [Indexed: 12/13/2022] Open
Abstract
Genome engineering of Lactobacillus casei, an important industrial microorganism for dairy fermented product, currently relies on inefficient and time-consuming double crossover events. In this study, we developed an easy-to-use genome engineering strategy for metabolic engineering of L. casei for acetoin production. Plasmid pMSP456-Cre, that contains prophage recombinase operon LCABL_13040-50-60 driven by the nisin-controlled inducible expression (NICE) system and the site-specific recombinase gene cre under the control of the promoter of the lactose operon from L. casei, was constructed. Using this plasmid, integration of a hicD3 gene linear donor cassette (up-lox66-cat-lox71-down) was catalyzed by the LCABL_13040-50-60 recombinase and the cat gene was excised by the Cre/lox system with an efficiency of 60%. To demonstrate this system for sequential and iterative knocking out genes in L. casei, another three genes (pflB, ldh and pdhC) related to acetoin production were deleted with the efficiencies of 60, 40, and 60%, respectively. The yielding quadruple mutant could produce a ∼18-fold higher amount of acetoin than the wild-type and converted 59.8% of glucose to acetoin in aerobic. Therefore, these results proved this simple genome engineering strategy have potential in metabolic engineering of L. casei for production of high value-added metabolites.
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Affiliation(s)
- Yongping Xin
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Tingting Guo
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Yingli Mu
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Jian Kong
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
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Generation of Lactobacillus plantarum strains with improved potential to target gastrointestinal disorders related to sugar malabsorption. Food Res Int 2017; 94:45-53. [DOI: 10.1016/j.foodres.2017.01.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 01/06/2017] [Accepted: 01/25/2017] [Indexed: 12/14/2022]
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Guo T, Ouyang X, Xin Y, Wang Y, Zhang S, Kong J. Characterization of a New Cell Envelope Proteinase PrtP from Lactobacillus rhamnosus CGMCC11055. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:6985-92. [PMID: 27585760 DOI: 10.1021/acs.jafc.6b03379] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Cell envelope proteinases (CEPs) play essential roles in lactic acid bacteria growth in milk and health-promoting properties of fermented dairy products. The genome of Lactobacillus rhamnosus CGMCC11055 possesses two putative CEP genes prtP and prtR2, and the PrtP displays the distinctive domain organization from PrtR2 reported. The PrtP was purified and biochemically characterized. The results showed that the optimal activity occurred at 44 °C, pH 6.5. p-Amidinophenylmethylsulfonyl fluoride obviously inhibited enzymatic activity, suggesting PrtP was a member of serine proteinases. Under the optimal conditions, β-casein was a favorite substrate over αS1- and κ-casein, and 35 oligopeptides were identified in the β-casein hydrolysate, including the phosphoserine peptide and bioactive isoleucine-proline-proline. By analysis of the amino acid sequences of those oligopeptides, proline was the preferred residue at the breakdown site. Therefore, we speculated that PrtP was a new type of CEPs from Lb. rhamnosus.
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Affiliation(s)
- Tingting Guo
- State Key Laboratory of Microbial Technology, Shandong University , Jinan 250100, P. R. China
| | - Xudong Ouyang
- State Key Laboratory of Microbial Technology, Shandong University , Jinan 250100, P. R. China
| | - Yongping Xin
- State Key Laboratory of Microbial Technology, Shandong University , Jinan 250100, P. R. China
| | - Yue Wang
- State Key Laboratory of Microbial Technology, Shandong University , Jinan 250100, P. R. China
| | - Susu Zhang
- State Key Laboratory of Microbial Technology, Shandong University , Jinan 250100, P. R. China
| | - Jian Kong
- State Key Laboratory of Microbial Technology, Shandong University , Jinan 250100, P. R. China
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