PEDOSPHERE
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2024
·
IF 5.2
Yang LIU,Lihua ZHU,Junyuan ZHANG,Zhuo WEI,Xuhan HUANG,Christian E.W. STEINBERG,Hao QIU,Martina G. VIJVER,Jing ZHAO,Willie J.G.M. PEIJNENBURG
Due to the complex composition of biochar and the potential interactions between the components that jointly make up biochar, previous studies have always shown controversial results regarding impacts of biochar on soil phosphorus (P) solubilization. Using a nested experimental design, this study investigated the effects of different components of biochar, i.e. whole biochar (BC), dissolved biochar (DBC) and washed biochar (WBC) on the microbial-mediated P solubilizing process. The growth of Bacillus megaterium , acid/alkaline phosphatase activity, differential metabolites of bacteria and metabolic pathways were measured in treatments with biochar pyrolyzed at 200, 300, 400, 500 and 600 °C. Results showed that BC, DBC and WBC all negatively affected the growth and alkaline phosphatase activity of B. megaterium , and BC500/WBC500 and BC400/WBC400 had the greatest impacts. The negative effects of high-temperature biochar on cell proliferation were caused by persistent free radicals and included down-regulation of histidine metabolism by BC400 and interference in nucleotide metabolism by BC600. The impacts of low-temperature biochar on cell proliferation and alkaline phosphatase activity were highly related to the metal content. Using the independent action model, antagonistic effects were found between DBC and WBC on inhibiting B. megaterium growth, while these biochars had synergistic effects on inhibition of alkaline phosphatase activity. Overall, this study provides insights on how biochar adversely modulates microbial-mediated P solubilization.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
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2024
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IF 7
Luyao Fan,Hongchao Dai,Wenyuan Zhou,Lei Yuan,Jia Yang,Zhenquan Yang,Xin-an Jiao
Bacillus licheniformis , a quick and strong biofilm former, is served as a persistent microbial contamination in the dairy industry. Its biofilm formation process is usually regulated by environmental factors including the divalent cation Ca 2+ . This work aims to investigate how different concentrations of Ca 2+ change biofilm-related phenotypes (bacterial motility, biofilm-forming capacity, biofilm structures, and EPS production) of dairy B . licheniformis strains. The Ca 2+ ions dependent regulation mechanism for B . licheniformis biofilm formation was further investigated by RNA-sequencing analysis. Results revealed that supplementation of Ca 2+ increased B . licheniformis biofilm formation in a dose-dependent way, and enhanced average coverage and thickness of biofilms with complex structures were observed by confocal laser scanning microscopy. Bacterial mobility of B. licheniformis was increased by the supplementation of Ca 2+ except the swarming ability at 20 mM of Ca 2+ . The addition of Ca 2+ decreased the contents of polysaccharides but promoted proteins production in EPS, and the ratio of proteins/polysaccharides content was significantly enhanced with increasing Ca 2+ concentrations. RNA-sequencing results clearly indicated the variation in regulating biofilm formation under different Ca 2+ concentrations, as 939 (671 upregulated and 268 downregulated) and 951 genes (581 upregulated and 370 downregulated) in B. licheniformis BL2-11 were induced by 10 and 20 mM of Ca 2+ , respectively. Differential genes were annotated in various KEGG pathways, including flagellar assembly, two-component system, quorum sensing, ABC transporters, and related carbohydrate and amino acid metabolism pathways. Collectively, the results unravel the significance of Ca 2+ as a biofilm-promoting signal for B. licheniformis in the dairy industry.
研究领域:
微生物学
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食品科学
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DOI
PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
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2021
·Vol. 232
·期 6
·1-14
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IF 2.52
Zhang Sinan,Wang Jihong
Biochar-immobilized microorganism technology is an effective way to remove antibiotic contamination in aqueous solutions. In this study, the effect and mechanism of immobilization of Bacillus subtilis by honeysuckle residue–derived biochar for the removal of chlortetracycline (CTC) were investigated using corn straw biochar as a comparison. The biochar’s structural characteristics and properties were determined using scanning electron microscopy, X-ray diffractometer, Fourier-transform infrared spectrometer, specific surface area, and pore size analyzer. It was found that honeysuckle residue–derived biochar had a well-developed pore structure, which provided adequate living space for microorganisms. The removal rate of CTC (50 mg/L) by honeysuckle residue biochar-microbial complex (HBCM) was 15.31% higher than that of corn straw biochar-microbial complex, indicating that HBCM was an excellent carrier. The mechanism of CTC removal by HBCM was a synergistic effect of biochar adsorption and microbial degradation. The removal process of HBCM material was carried out for 3 days at an optimum substrate concentration of 50 mg/L, an ambient temperature of 35 °C, a solution pH of 7, and the addition of 5 g/L complexes, achieving a removal rate of 78.35%. In addition, the complex possessed high storage stability and could be reused three times continuously and efficiently. This study provides a method for preparing an efficient biochar-microbial complex using Chinese medicine residue waste substrate, which provides a new idea for removing CTC from water.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
Biotechnology for Biofuels and Bioproducts
·
2024
·Vol. 17
·期 1
·1-16
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IF 3.3
Wei Xiaoyu,Yang Lijie,Chen Zhen,Xia Wenhao,Chen Yongbin,Cao Mingfeng,He Ning
Background The structural diversity of extracellular polymeric substances produced by microorganisms is attracting particular attention. Poly-gamma-glutamic acid (γ-PGA) is a widely studied extracellular polymeric substance from Bacillus species. The function of γ-PGA varies with its molecular weight (Mw). Results Herein, different endogenous promoters in Bacillus licheniformis were selected to regulate the expression levels of pgdS , resulting in the formation of γ-PGA with Mw values ranging from 1.61 × 10 3 to 2.03 × 10 4 kDa. The yields of γ-PGA and exopolysaccharides (EPS) both increased in the pgdS engineered strain with the lowest Mw and viscosity, in which the EPS content was almost tenfold higher than that of the wild-type strain. Subsequently, the compositions of EPS from the pgdS engineered strain also changed. Metabolomics and RT-qPCR further revealed that improving the transportation efficiency of EPS and the regulation of carbon flow of monosaccharide synthesis could affect the EPS yield. Conclusions Here, we present a novel insight that increased pgdS expression led to the degradation of γ-PGA Mw and changes in EPS composition, thereby stimulating EPS and γ-PGA production. The results indicated a close relationship between γ-PGA and EPS in B. licheniformis and provided an effective strategy for the controlled synthesis of extracellular polymeric substances.
研究领域:
微生物学
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生物化学
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合成生物学
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DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2018
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IF 3.974
Yuan Chen,Yuancai Chen,Jingyi Wu,Jianyi Zhang
In this paper, we found a bacteria ( Bacillus wiedmannii MSM) that could not only culture quickly under aerobic condition , but also can biological reduction of Pd (II) under both aerobic and anaerobic conditions. For reducing Pd (II) by Bacillus wiedmannii MSM, the best electron donor was sodium formate and the best growth time was 24 h (mid-log growth phase cells). TEM indicated that a lot of palladium nanoparticles (Pd-NPs) were mainly located in the periplasmic space of the live cells. However, the autoclaved cells could not synthesize Pd-NPs, which proved the role of enzyme in the reduction of Pd (II). A few of Pd-NPs were only formed on the surface of Cu 2+ -treated cells, which proved the main but not the only role of periplasmic hydrogenase in the reduction of Pd (II). XRD and XPS also proved that Pd-NPs could be synthesized by live cells over broad ranges of temperature (20–40 °C) and pH (pH 3.0–7.0). This may be especially useful for in situ reduction and remediation of Pd (II) for both anaerobic and aerobic wastewater.
研究领域:
环境科学
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微生物学
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DOI
PubMed
高影响因子
BMC MICROBIOLOGY
·
2025
·Vol. 25
·期 1
·1-13
·
IF 4.2
Cao Xiaoyu,Zhang Yu,Xu Qianqian,Yan Hai
The overproduction of uric acid, driven by its key precursors (inosine and guanosine), leads to hyperuricemia, a metabolic disorder associated with severe complications such as gout and renal dysfunction. Here, a promising bacterial strain YC06 with excellent biodegradation capability for inosine and guanosine was successfully isolated from healthy individual feces and identified as Bacillus paranthracis through average nucleotide identity (ANI) analysis. B. paranthracis YC06 resting cells (live but suspended in PBS buffer) and its cell-free extracts could effectively biodegrade inosine and guanosine in vitro. Whole-genome sequencing revealed a 5,535,183 bp draft genome (52 contigs, 35.22% GC content) containing 5,672 protein-coding genes. B. paranthracis YC06 demonstrated high survival rates in simulated gastrointestinal fluids, supported by the presence of stress-response genes and bile salt hydrolase genes associated with gastrointestinal tolerance. However, this strain exhibited hemolytic activity and no amino acid decarboxylase activity, while hemolysin genes, antibiotic genes and toxin-producing genes were identified, raising potential biosafety concerns for its further application. The gene functional annotation and polymerase chain reaction (PCR) amplification electrophoresis identified key genes ( rihA , rihB , deoD and pnp ) encoding purine nucleosidase and purine-nucleoside phosphorylase, and combined with biodegradation product analysis, elucidated the pathways of inosine and guanosine biodegradation into hypoxanthine and guanine. Comprehensive safety evaluations, including cytotoxicity assay and in vivo pathogenicity studies, must be conducted to rigorously assess its risks prior to practical utilization.
研究领域:
微生物学
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医学
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基因组学
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DOI
PubMed
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
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2022
·Vol. 88
·期 19
·
IF 5.005
Shuai Liu,Yuwei Gao,Lin Quan,Mei Yang,Yong-Zhong Wang,Changjun Hou
An increase in exoenzyme production can be enhanced by environmental stresses such as graphene oxide (GO) stress, but the link between the two events is still unclear. In this work, the effect of GO as an environmental stress factor on exoenzyme (lignocellulolytic enzyme, amylase, peptidase, and protease) biosynthesis was investigated in Bacillus subtilis Z2, and a plausible mechanism by which cytosolic Ca2+ regulates lignocellulolytic enzyme production in B. subtilis Z2 subjected to GO stress was proposed. The filter paper-hydrolyzing (FPase [representing total cellulase]), carboxymethylcellulase (CMCase [representing endoglucanase]), and β-glucosidase activities and extracellular protein concentration of the wild-type strain under 10 μg/mL GO stress were 1.37-, 1.64-, 1.24-, and 1.16-fold those of the control (without GO stress), respectively. Correspondingly, the transcription levels of lignocellulolytic enzyme genes, cytosolic Ca2+ level, and biomass concentration of B. subtilis were all increased. With lignocellulolytic enzyme from B. subtilis used to hydrolyze alkali-pretreated rice straw, the released reducing sugar concentration reached 265.53 mg/g, and the removal rates of cellulose, hemicellulose, and lignin were 52.4%, 30.1%, and 7.5%, respectively. Furthermore, transcriptome data revealed that intracellular Ca2+ homeostasis played a key role in regulating the levels of gene transcription related to the synthesis of lignocellulolytic enzymes and exoenzymes. Finally, the use of Ca2+ inhibitors (LaCl3 and EDTA) and deletion of spcF (a calmodulin-like protein gene) further demonstrated that the overexpression of those genes was regulated via calcium signaling in B. subtilis subjected to GO stress.IMPORTANCE To effectively convert lignocellulose into fermentable sugars, high lignocellulolytic enzyme loading is needed. Graphene oxide (GO) has been shown to promote exoenzyme (lignocellulolytic enzyme, amylase, peptidase, and protease) production in some microorganisms; however, the regulatory mechanism of the biosynthesis of lignocellulolytic enzymes under GO stress remains unclear. In this work, the lignocellulolytic enzyme production of B. subtilis under GO stress was investigated, and the potential mechanism by which B. subtilis enhanced lignocellulolytic enzyme production through the calcium signaling pathway under GO stress was proposed. This work revealed the role of calcium signaling in the production of enzymes under external environmental stress and provided a direction to facilitate lignocellulolytic enzyme production by B. subtilis.
研究领域:
微生物学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
Food Bioscience
·
2023
·
IF 5.2
Kaiyong Yao,Qile Xia,Yan Cao,Bindan Chen,Jie Cai,Chenxing Liu
Yellow wine lees (YWL) are the main byproduct in the yellow wine brewing and can be used as animal feed. The deficiencies in fiber digestibility and amino acid equilibrium of YWL limited its utility value in animal feeding. The nutritional profile of YWL could be moderated after fermentation treatment. We fermented YWL with Candida utilis KF01 and Bacillus subtilis KF02, whose genomes were sequenced. We set three groups in the animal test with 15 Holstein cows : control, YWL, and fermented yellow wine lees (FYWL) group. 206 and 5 amino acid metabolism-related KEGG pathways, as well as 5257 (639 GO and 4618 eggNOG annotations) and 1579 (372 GO and 1207 eggNOG annotations) amino acid metabolism-related gene annotations were found in C. utilis KF01 and B. subtilis KF02. The collected milk samples were analyzed for composition. The contents of mono-unsaturated fatty acid (MUFA, 36.90% relative content), poly-unsaturated fatty acid (PUFA, 5.63% relative content), and essential amino acid (EAA, 2.01%) in the FYWL group milk were significantly (P < 0.05) higher. The content of flavor substances in the FYWL group (146.33 ng/mL) was the highest, followed by the control (89.19 ng/mL) and the YWL group (41.36 ng/mL). The principal component analysis (PCA) result presented the intra-group variations in flavor substances and differences in single substance among all groups. Feeding FYWL had significant effects (P < 0.05) in the Holstein cows on the milk composition.
研究领域:
动物营养学
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微生物学
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食品科学
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DOI
高影响因子
BIOTECHNOLOGY AND BIOPROCESS ENGINEERING
·
2021
·Vol. 26
·期 6
·910-922
·
IF 2.836
Chen Yi,Zhao Min,Hu Liyong,Wang Zeyu,Hrynsphan Dzmitry,Chen Jun
Acrylic acid has been widely used in various industrial applications but is harmful to human health and the environment. A novel and efficient degrading acrylic acid bacterium was isolated and identified as Bacillus aryabhattai CY. In this study, batch experiments were conducted to evaluate the biodegradation of acrylic acid by B. aryabhattai CY, which were immobilized in calcium-alginate beads under different conditions. The components of the alginate beads were optimized by the response surface method, and the degradation performance of the immobilized cells was determined. Relative to the free cells, experiment results showed that the immobilized cells can achieve complete degradation of 100 mg/L acrylic acid in 24 h under the optimal conditions of SA 6% (w/v), CaCl 2 1% (w/v), and immobilization time of 6 h. According to Haldane’s model, the maximum specific growth rate ( μ max ) of the free cells and immobilized cells were 0.165/h and 0.210/h, respectively. Experiment data revealed that acrylic acid showed an inhibitory effect on biodegradation by B. aryabhattai CY, especially at concentration higher than 100 mg/L. Furthermore, the reusability of the immobilized cells revealed that the acrylic acid removal rate was above 93.70% within the eight cycles. The immobilized cells also showed higher removal efficiencies in wider ranges of temperature (20°C–60°C) and pH (5.0–10.0) than the free cells. Moreover, the possible degradation intermediates were proposed during the biodegradation of acrylic acid by GC-MS analysis. Results indicated that immobilized beads might have a potential environmental implication in the purification of practical acrylic acid wastewater.
研究领域:
环境生物学
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微生物学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Jintao Yan,Liangqiang Chen,Mengjing Teng,Mengdi Hao,Bin Feng,Fan Yang,Hao Shen,Shaoning Yu,Li Wang
Bacillus cereus is one of the most common foodborne pathogens and is widely distributed in foods, soil, water, plants and fodder. As an aerobic Gram-positive bacteria, B. cereus also plays an important role in liquor production, generating flavor enhancers and antibacterial substances. Therefore, a rapid and precise analysis strategy for this microbe is highly desired in food safety and sustainable food production. In this study, we propose an effective approach for B. cereus quantification using a dual recognition biosensor. B. cereus was specifically enriched with aptamer-functionalized magnetic beads, and then detected using the broad-spectrum fluorescent material, fragmented crystalline mannose-conjugated lectin-modified nano-MIL-53(Al)-NH 2 ( [email protected] ). The dual recognition method was applied for specific quantification of B. cereus in the range of 20–2 × 10 8 CFU/mL with a limit of detection of 4 CFU/mL within 60 min. Recoveries ranged from 93.8%−100.8% in milk, rice, chicken meat, eggs, and distilled yeast as real samples were also obtained.
研究领域:
微生物学
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食品科学
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生物传感技术
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产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Zhang Sinan,Wang Jihong,Wang Shuhua,Leng Su
Contamination of chlortetracycline (CTC) in water is a global problem that needs to be addressed urgently. Biochar immobilization of microorganisms is an effective way to remove CTC contamination from sewage. In this study, the CTC removal effect of free bacteria LZ01 and erding medicine residues biochar immobilized LZ01 was compared by shake flask batch experiments. The results showed that immobilized LZ01 significantly improved the CTC removal rate by 15.27% compared to free LZ01. The immobilization of LZ01 also significantly improved the environmental tolerance and the reusability and storage stability of strain LZ01. The optimal conditions for CTC removal (83.83%) by immobilized LZ01 were determined by response surface methodology: temperature of 33.98 °C, pH of 7.84, initial CTC concentration of 73.75 mg/L, and inoculation dose of 0.51% (w/v). The experimental results of treating CTC from simulated sewage showed that the immobilized LZ01 could remove more than 64% of CTC from the sewage. The ion of Cu 2+ accelerated the removal of CTC by immobilized LZ01, and the removal rates could reach 81.07%, 85.07%, and 87.50% in three sewages, i.e., river sewage, pond water, and farming wastewater, respectively. This study provides a feasible, effective, and rapid biological removal technique for the treatment of CTC pollution in sewage.
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Hongyun Zhang,Ying Xia,Mingpeng Zhou,Jianyong Zheng,Zhao Wang,Yinjun Zhang
An intracellular esterase (BCE) from Bacillus cereus WZZ006 was purified to homogeneity with an 89.5-fold purification , specific activity of 1.79 U/mg, and 26.7% recovery. The estimated molecular weight of BCE was 96 kDa which was analyzed by SDS-PAGE and MALDI-TOF-MS. Activity staining denotes that BCE has an unexplored new carboxyl esterase characteristic. BCE enzyme activity was maximum at pH 8.5 and also at 50 °C with p NP-caproate as a substrate. This indicates that the studied BCE as a thermoalkaliphilic esterase. The kinetic properties like K m , V max , k cat and k cat/ K m value for BCE was found to be 0.98 mM, 0.03 mM/min, 69.47 min −1 and 70.89 mM −1 min −1 , respectively. Synthesis of ( S )-5-chloro-1-oxo-2,3-dihydro-2-hydroxy-1H-indole-2-carboxylic acid methyl ester (( S )-CODHCM) by BCE can be shortened to 3 h compared to 36 h with whole-cell catalysis. The e.e. s achieved was 93.83%, and conversion around 52.78% with E being 39.95. These features render BCE as a promising biocatalyst for the synthesis of a key chiral intermediate for indoxacarb.
研究领域:
生物化学
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酶工程
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）