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Wu L, Long H, Huang S, Niu X, Li S, Yu X, You L, Ran X, Wang J. Bacterial diversity in water from Xifeng Hot Spring in China. Braz J Microbiol 2023; 54:1943-1954. [PMID: 37594656 PMCID: PMC10484846 DOI: 10.1007/s42770-023-01070-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 07/15/2023] [Indexed: 08/19/2023] Open
Abstract
The Xifeng Hot Spring is one of the eight largest hot springs in China, which is rich in radon gas and sulphur in karst scenery. Little is known about the microbiota structure in the spring. The water was collected from three sites containing the outlet of spring water discharge site (OWD), spring pool for tourist (SPT) and sewage effluent pool (SEP) in the Xifeng Hot Spring and further analyzed by culture-independent technique and culture-dependent method. A total of 57 phyla were identified from the water samples. The dominate phyla at OWD was Bacteroidetes (46.93%), while it was Proteobacteria in both sites of SEP and SPT with relative richness of 61.9% and 94.9%, respectively. Two bacteria, Deinococcus and Hymenobacter, that confirmed to be radiation-resistant, seven sulphur bacteria and three thermophilic bacteria were detected from Xifeng Hot Spring. Furthermore, it was found that genus Flavobacterium was susceptible to environmental change with abundance of 11 ~ 2825 times higher in OWD than the other two groups. Compared bacteria from the OWD group with that from 14 hot springs in six countries, total 94 unique genera bacteria were found out from the Xifeng Hot Spring including four thiometabolism-related bacteria (Propionispira, Desulforegula, Desulfobacter and Desulfococcus) and the thermophilic bacterium (Symbiobacterium). Using microbial culturing and isolation technology, sixteen strains were isolated from the water samples of three sites. The diversity of microbiota was abundant and variable along with the niche changed in conditions and surroundings. It indicated that numbers of valuable bacteria resources could be explored from the special surroundings of Xifeng Hot Spring.
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Affiliation(s)
- Lijuan Wu
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China
| | - Hong Long
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China
| | - Shihui Huang
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China
| | - Xi Niu
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China
| | - Sheng Li
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China
| | - Xing Yu
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China
| | - Longjiang You
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China
| | - Xueqin Ran
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China.
| | - Jiafu Wang
- College of Animal Science/Institute of Agro-Bioengineering, Key Laboratory of Animal Genetics, Breeding and Reproduction in the Plateau Mountainous Region and Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou University, Guiyang, China.
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Narsing Rao MP, Dong ZY, Luo ZH, Li MM, Liu BB, Guo SX, Hozzein WN, Xiao M, Li WJ. Physicochemical and Microbial Diversity Analyses of Indian Hot Springs. Front Microbiol 2021; 12:627200. [PMID: 33763045 PMCID: PMC7982846 DOI: 10.3389/fmicb.2021.627200] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Accepted: 02/08/2021] [Indexed: 12/31/2022] Open
Abstract
In the present study, physicochemical and microbial diversity analyses of seven Indian hot springs were performed. The temperature at the sample sites ranged from 32 to 67°C, and pH remained neutral to slightly alkaline. pH and temperature influenced microbial diversity. Culture-independent microbial diversity analysis suggested bacteria as the dominant group (99.3%) when compared with the archaeal group (0.7%). Alpha diversity analysis showed that microbial richness decreased with the increase of temperature, and beta diversity analysis showed clustering based on location. A total of 131 strains (divided into 12 genera and four phyla) were isolated from the hot spring samples. Incubation temperatures of 37 and 45°C and T5 medium were more suitable for bacterial isolation. Some of the isolated strains shared low 16S rRNA gene sequence similarity, suggesting that they may be novel bacterial candidates. Some strains produced thermostable enzymes. Dominant microbial communities were found to be different depending on the culture-dependent and culture-independent methods. Such differences could be attributed to the fact that most microbes in the studied samples were not cultivable under laboratory conditions. Culture-dependent and culture-independent microbial diversities suggest that these springs not only harbor novel microbial candidates but also produce thermostable enzymes, and hence, appropriate methods should be developed to isolate the uncultivated microbial taxa.
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Affiliation(s)
- Manik Prabhu Narsing Rao
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Zhou-Yan Dong
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-sen University, Guangzhou, China.,Department of Pathogenic Biology, School of Basic Medical Sciences, Binzhou Medical University, Yantai, China
| | - Zhen-Hao Luo
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Meng-Meng Li
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Bing-Bing Liu
- Henan Key Laboratory of Industrial Microbial Resources and Fermentation Technology, College of Biological and Chemical Engineering, Nanyang Institute of Technology, Nanyang, China
| | - Shu-Xian Guo
- Henan Key Laboratory of Industrial Microbial Resources and Fermentation Technology, College of Biological and Chemical Engineering, Nanyang Institute of Technology, Nanyang, China
| | - Wael N Hozzein
- Bioproducts Research Chair, Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia.,Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
| | - Min Xiao
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Wen-Jun Li
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), School of Life Sciences, Sun Yat-sen University, Guangzhou, China.,State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
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Chen L, Wang Y, Chen Z, Cai Z. The fouling layer development on MD membrane for water treatments: An especial focus on the biofouling progress. CHEMOSPHERE 2021; 264:128458. [PMID: 33039691 DOI: 10.1016/j.chemosphere.2020.128458] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 09/04/2020] [Accepted: 09/27/2020] [Indexed: 06/11/2023]
Abstract
This study evaluated the fouling development of membrane distillation (MD) when treating different feed waters were taken from three local water bodies: Xuanwu Lake, Nan Lake and Qinhuai River. Trends of flux decline could be divided into three phases including a similar rapid decline in first phase, a slow decline in phase II, while significant difference was observed in the last phase. It could be seen that inorganic matters in feed waters had some influences on the attachment of salt crystals to membrane, mainly in the form of CaCO3. Furthermore, the biovolume exhibited little difference but the amount of extracellular polymeric substances (EPS) was distinct in the three systems. 16S rRNA revealed that although the microbial communities in feed waters had different structures, they on-membrane microbes shared the same dominant communities in the early stage due to the same growth environment including Tepidimonas, Meiothermus, OLB14_norank, Env.OPS 17_norank and Schlegelella with a relatively stable proportion of 63.5%-68.0%. However, at the later operational phase, the bacteria composition was changed with community succession, and Armatimonadetes_norank, Hydrogenophilaceae_uncultured and Methyloversatilis respectively thrived on the three scaling membrane surfaces which was correlated with the concentration of feed water, resulting the influence of inorganic substances on microbial growth was enhanced. A result obviously suggested that bacteria had great influence on the degree of flux decline due to their structure and property, especially at the later operational phase. It would be helpful to explore the structure and potential function of dominant communities on membranes and provide basic theory for the treatment of microbial pollution.
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Affiliation(s)
- Lin Chen
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China.
| | - Yuchen Wang
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Zaiyu Chen
- Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Zongting Cai
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield City, S1 3JD, United Kingdom
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Allala F, Bouacem K, Boucherba N, Mechri S, Kriaa M, Arkoub-Djoudi W, Azzouz Z, Benallaoua S, Hacene H, Jaouadi B, Bouanane-Darenfed A. α-Amylase production by Tepidimonas fonticaldi strain HB23: statistical optimization and compatibility study for use in detergent formulations. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:37164-37172. [PMID: 32705554 DOI: 10.1007/s11356-020-10142-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 07/15/2020] [Indexed: 06/11/2023]
Abstract
In a previous study, a thermostable α-amylase-producing bacterium (designated HB23) was isolated from an Algerian hydrothermal spring. In the present study, the native strain was subjected to a statistical optimization aimed at enhancing the α-amylase production. To achieve this, thirteen factors have been studied, among which are cultural and nutritional parameters. Wheat bran, a by-product of the grain milling industry, was the factor that positively influenced α-amylase production. A modified L27 Taguchi design was used to screen these factors. Furthermore, a Box-Behnken matrix, supplemented by the use of response surface methodology (RSM), allowed for the identification of optimum levels of the following factors: a 1% inoculum size, 15 g/L soluble starch, 5 g/L wheat bran, and 1 g/L tryptone. Optimized conditions resulted in an amylolytic activity of 320 U/mL, which is a tenfold increase when compared with unoptimized production level. Phenotypical and molecular identification of strain HB23 revealed its close relationship to various Tepidimonas strains, specifically to Tepidimonas fonticaldi. The crude enzyme preparation turned out to be compatible with various laundry detergents and led to a substantial improvement in their washing performance. A comparison of the performance of the crude enzyme preparation with that of the commercial α-amylase (Termamyl® 300 L) highlights the potential of the HB23 enzyme as a bio-additive in detergent formulations.
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Affiliation(s)
- Fawzi Allala
- Laboratory of Cellular and Molecular Biology, Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria.
- Laboratory of Applied Microbiology, Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000, Bejaïa, Algeria.
| | - Khelifa Bouacem
- Laboratory of Cellular and Molecular Biology, Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria
| | - Nawel Boucherba
- Laboratory of Applied Microbiology, Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000, Bejaïa, Algeria
| | - Sondes Mechri
- Laboratory of Microbial Biotechnology, Enzymatic, and Biomolecules, Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
| | - Mouna Kriaa
- Laboratory of Microbial Biotechnology, Enzymatic, and Biomolecules, Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
| | - Warda Arkoub-Djoudi
- Laboratory of Applied Microbiology, Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000, Bejaïa, Algeria
| | - Zahra Azzouz
- Laboratory of Applied Microbiology, Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000, Bejaïa, Algeria
| | - Said Benallaoua
- Laboratory of Applied Microbiology, Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000, Bejaïa, Algeria
| | - Hocine Hacene
- Laboratory of Cellular and Molecular Biology, Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria
| | - Bassem Jaouadi
- Laboratory of Microbial Biotechnology, Enzymatic, and Biomolecules, Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
| | - Amel Bouanane-Darenfed
- Laboratory of Cellular and Molecular Biology, Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria.
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Liu C, Zhu L, Chen L. Effect of salt and metal accumulation on performance of membrane distillation system and microbial community succession in membrane biofilms. WATER RESEARCH 2020; 177:115805. [PMID: 32311577 DOI: 10.1016/j.watres.2020.115805] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 04/02/2020] [Accepted: 04/05/2020] [Indexed: 06/11/2023]
Abstract
Membrane distillation (MD) works as a potential technology for the "zero liquid discharge" water treatment owing to its high concentration brine tolerance. The continuous accumulation of salts and metals in the MD system during the "zero liquid discharge" water treatment inevitably posed remarkable impacts on the biofilm formation as well as the MD performance. Hence, the biofouling mechanism of MD was deeply researched in this study with an emphasis on the roles of salt-stress (NaCl) and metal-stress (Zn and Fe) in biofilm development. The membrane flux decline of MD was effectively mitigated by the appearance of NaCl and ZnO, while that was significantly aggravated under the metal-stress of Fe. Considering the serious membrane scaling caused by NaCl crystals, a sharp flux decline was seen for the NaCl group during the later stage of MD operation. Basing on the 16S rDNA and 16S rRNA analysis, heat-stress, salt-stress, and metal-stress all posed certain impacts on the biofouling development in the MD system, and a more remarkable influence was observed for metal-stress. Under the salt-stress from NaCl, a thin biofilm containing high biovolume of dead cells finally formed, in which the bacterial community mainly consisted of halotolerant and thermophile species. Owing to the Zn2+-stress and oxidation-stress mechanisms of ZnO, the bacteria in the MD system were largely dead and live bacterial community in biofilms was dominated by some gram-negative species. Under the metal-stress from Fe, a rather thick biofilm containing higher biovolume of live cells clearly developed, in which the prevailing species could secret large amounts of EPS and accumulate metabolites around cells as biological surfactants, inducing aggravated membrane biofouling and high risk of membrane wetting.
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Affiliation(s)
- Chang Liu
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
| | - Liang Zhu
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China.
| | - Lin Chen
- Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China; College of Environment, Hohai University, Nanjing, 210098, China
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Albuquerque L, Castelhano N, Raposo P, Froufe HJC, Tiago I, Severino R, Roxo I, Gregório I, Barroso C, Egas C, da Costa MS. Comparative genome sequence analysis of several species in the genus Tepidimonas and the description of a novel species Tepidimonas charontis sp. nov. Int J Syst Evol Microbiol 2020; 70:1596-1604. [PMID: 32228748 PMCID: PMC7386788 DOI: 10.1099/ijsem.0.003942] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 10/22/2019] [Accepted: 12/06/2019] [Indexed: 11/18/2022] Open
Abstract
We performed high-quality genome sequencing of eight strains of the species of the genus Tepidimonas and examined the genomes of closely related strains from the databases to understand why Tepidimonas taiwanensis is the only strain of this genus that utilizes glucose and fructose for growth. We found that the assimilation of these hexoses by T. taiwanensis was due to the presence of two transporters that are absent in all other genomes of strains of members of the genus Tepidimonas examined. Some strains lack genes coding for glucokinase, but the Embden-Meyerhof-Parnas pathway appears to be otherwise complete. The pentose phosphate pathway has a complete set of genes, but genes of the Entner-Doudoroff pathway were not identified in the genomes of any of the strains examined. Genome analysis using average nucleotide identity (ANIb), digital DNA-DNA hybridization (dDDH), average amino acid identity (AAI) and phylogenetic analysis of 400 conserved genes was performed to assess the taxonomic classification of the organisms. Two isolates of the genus Tepidimonas from the hot spring at São Pedro do Sul, Portugal, designated SPSP-6T and SPSPC-18 were also examined in this study. These organisms are mixotrophic, have an optimum growth temperature of about 50 ºC, utilize several organic acids and amino acids for growth but do not grow on sugars. Distinctive phenotypic, 16S rRNA gene sequence and genomic characteristics of strains SPSP-6T and SPSPC-18 lead us to propose a novel species based on strain SPSP-6T for which we recommend the name Tepidimonas charontis sp. nov. (=CECT 9683T=LMG 30884T).
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Affiliation(s)
- Luciana Albuquerque
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Nadine Castelhano
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Pedro Raposo
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Hugo J. C. Froufe
- Next Generation Sequencing Unit, Biocant, BiocantPark, Núcleo 04, Lote 8, 3060-197 Cantanhede, Portugal
| | - Igor Tiago
- Center for Functional Ecology, University of Coimbra, 3000-456, Coimbra, Portugal
| | - Rita Severino
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Inês Roxo
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Inês Gregório
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Cristina Barroso
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
- Next Generation Sequencing Unit, Biocant, BiocantPark, Núcleo 04, Lote 8, 3060-197 Cantanhede, Portugal
| | - Conceição Egas
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
- Next Generation Sequencing Unit, Biocant, BiocantPark, Núcleo 04, Lote 8, 3060-197 Cantanhede, Portugal
| | - Milton S. da Costa
- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
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Allala F, Bouacem K, Boucherba N, Azzouz Z, Mechri S, Sahnoun M, Benallaoua S, Hacene H, Jaouadi B, Bouanane-Darenfed A. Purification, biochemical, and molecular characterization of a novel extracellular thermostable and alkaline α-amylase from Tepidimonas fonticaldi strain HB23. Int J Biol Macromol 2019; 132:558-574. [PMID: 30928371 DOI: 10.1016/j.ijbiomac.2019.03.201] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 01/16/2019] [Accepted: 03/26/2019] [Indexed: 11/25/2022]
Abstract
The present study investigated the purification, biochemical, and molecular characterization of a novel thermostable α-amylase (TfAmy48) from Tepidimonas fonticaldi strain HB23. MALDI-TOF/MS analysis indicated that the purified enzyme is a monomer with a molecular mass of 48,138.10 Da. The results from amino-acid sequence analysis revealed high homology between the 25 NH2-terminal residues of TfAmy48 and those of Gammaproteobacteria α-amylases. The optimum pH and temperature values for α-amylase activity were pH 8 and 80 °C, respectively. Thin-layer chromatography (TLC) analysis showed that the final hydrolyzed products of the enzyme from soluble potato starch were maltopentaose, maltose, and maltotriose, which indicate that TfAmy48 possessed an endo-acting pattern. Compared to Termamyl®300 L, TfAmy48 showed extreme stability and tolerance towards organic solvents and excellent compatibility with some commercial laundry detergents. These proprieties make TfAmy48 enzyme a potential candidate as a cleaning bioadditive in detergent composition. The Tfamy48 gene encoding TfAmy48 was cloned, sequenced, and heterologously-expressed in the extracellular fraction of Escherichia coli strain BL21(DE3)pLysS. The biochemical properties of the extracellular purified recombinant enzyme (rTfAmy48) were similar to those of native one. The highest sequence identity value (97%) was obtained with PsAmy1 α-amylase from Pseudomonas sp. strain KFCC10818, with only 16 amino-acid (aa) residues of difference.
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Affiliation(s)
- Fawzi Allala
- Laboratory of Cellular and Molecular Biology (LCMB), Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria; Laboratory of Applied Microbiology (LAM), Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000 Bejaïa, Algeria
| | - Khelifa Bouacem
- Laboratory of Cellular and Molecular Biology (LCMB), Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria; Laboratory of Microbial Biotechnology and Engineering Enzymes (LMBEE), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Nawel Boucherba
- Laboratory of Applied Microbiology (LAM), Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000 Bejaïa, Algeria.
| | - Zahra Azzouz
- Laboratory of Applied Microbiology (LAM), Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000 Bejaïa, Algeria
| | - Sondes Mechri
- Laboratory of Microbial Biotechnology and Engineering Enzymes (LMBEE), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Mouna Sahnoun
- Laboratory of Microbial Biotechnology and Engineering Enzymes (LMBEE), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Said Benallaoua
- Laboratory of Applied Microbiology (LAM), Faculty of Nature and Life Sciences, University of Bejaïa, Targa Ouzemmour, 06000 Bejaïa, Algeria
| | - Hocine Hacene
- Laboratory of Cellular and Molecular Biology (LCMB), Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria
| | - Bassem Jaouadi
- Laboratory of Microbial Biotechnology and Engineering Enzymes (LMBEE), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, Sfax 3018, Tunisia; Biotech ECOZYM Start-up, Business Incubator, Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, Sfax 3018, Tunisia
| | - Amel Bouanane-Darenfed
- Laboratory of Cellular and Molecular Biology (LCMB), Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria.
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Zhou J, Li H, Xia X, Herrera A, Pollock N, Reebye V, Sodergren MH, Dorman S, Littman BH, Doogan D, Huang KW, Habib R, Blakey D, Habib NA, Rossi JJ. Anti-inflammatory Activity of MTL-CEBPA, a Small Activating RNA Drug, in LPS-Stimulated Monocytes and Humanized Mice. Mol Ther 2019; 27:999-1016. [PMID: 30852139 PMCID: PMC6520465 DOI: 10.1016/j.ymthe.2019.02.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 02/19/2019] [Accepted: 02/20/2019] [Indexed: 12/24/2022] Open
Abstract
Excessive or inappropriate inflammatory responses can cause serious and even fatal diseases. The CCAAT/enhancer-binding protein alpha (CEBPA) gene encodes C/EBPα, a transcription factor that plays a fundamental role in controlling maturation of the myeloid lineage and is also expressed during the late phase of inflammatory responses when signs of inflammation are decreasing. MTL-CEBPA, a small activating RNA targeting for upregulation of C/EBPα, is currently being evaluated in a phase 1b trial for treatment of hepatocellular carcinoma. After dosing, subjects had reduced levels of pro-inflammatory cytokines, and we therefore hypothesized that MTL-CEBPA has anti-inflammatory potential. The current study was conducted to determine the effects of C/EBPα saRNA - CEBPA-51 - on inflammation in vitro and in vivo after endotoxin challenge. CEBPA-51 led to increased expression of the C/EBPα gene and inhibition of pro-inflammatory cytokines in THP-1 monocytes previously stimulated by E. coli-derived lipopolysaccharide (LPS). Treatment with MTL-CEBPA in an LPS-challenged humanized mouse model upregulated C/EBPα mRNA, increased neutrophils, and attenuated production of several key pro-inflammatory cytokines, including TNF-α, IL-6, IL-1β, and IFN-γ. In addition, a Luminex analysis of mouse serum revealed that MTL-CEBPA reduced pro-inflammatory cytokines and increased the anti-inflammatory cytokine IL-10. Collectively, the data support further investigation of MTL-CEBPA in acute and chronic inflammatory diseases where this mechanism has pathogenic importance.
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Affiliation(s)
- Jiehua Zhou
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Haitang Li
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Xin Xia
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Alberto Herrera
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Nicolette Pollock
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
| | - Vikash Reebye
- Department of Surgery and Cancer, Imperial College London, London SW7 5NH, UK
| | - Mikael H Sodergren
- Department of Surgery and Cancer, Imperial College London, London SW7 5NH, UK
| | - Stephanie Dorman
- Department of Surgery and Cancer, Imperial College London, London SW7 5NH, UK
| | - Bruce H Littman
- Translational Medicine Associates, LLC, Savannah, GA 31302, USA
| | | | - Kai-Wen Huang
- Department of Surgery and Hepatitis Research Center, National Taiwan University Hospital, College of Medicine, Taipei 10617, Taiwan
| | | | | | - Nagy A Habib
- Department of Surgery and Cancer, Imperial College London, London SW7 5NH, UK; MiNA Therapeutics, Ltd., London W12 0BZ, UK.
| | - John J Rossi
- Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA.
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9
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Oren A, Garrity GM. List of new names and new combinations previously effectively, but not validly, published. Int J Syst Evol Microbiol 2019; 69:5-9. [PMID: 30614438 DOI: 10.1099/ijsem.0.003174] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Affiliation(s)
- Aharon Oren
- 1The Institute of Life Sciences, The Hebrew University of Jerusalem, The Edmond J. Safra Campus, 9190401 Jerusalem, Israel
| | - George M Garrity
- 2Department of Microbiology and Molecular Genetics, Biomedical Physical Sciences, Michigan State University, East Lansing, MI 48824-4320, USA
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