Microbial Cell Factories最新文献

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Improving the bacillomycin L production in Bacillus amyloliquefaciens by atmospheric and room-temperature plasma combined with Box-Behnken design. 常压和室温等离子体结合Box-Behnken设计提高解淀粉芽孢杆菌产杆菌素L的研究
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-23 DOI: 10.1186/s12934-025-02774-1
Andong Zhang, Bin Yang, Yudong Ma, Ruolin Li, Zhiwei Zhou, Chen Luo, Yiyang Zhang, Yuhan Zhang, Ya Dan, Qun Sun
{"title":"Improving the bacillomycin L production in Bacillus amyloliquefaciens by atmospheric and room-temperature plasma combined with Box-Behnken design.","authors":"Andong Zhang, Bin Yang, Yudong Ma, Ruolin Li, Zhiwei Zhou, Chen Luo, Yiyang Zhang, Yuhan Zhang, Ya Dan, Qun Sun","doi":"10.1186/s12934-025-02774-1","DOIUrl":"10.1186/s12934-025-02774-1","url":null,"abstract":"<p><p>Bacillomycin L, a cyclic lipopeptide derived from Bacillus amyloliquefaciens, has great potential for developing biochemical phytofungicides. In this study, a mutant M86 with high anti-Botrytis cinerea activity was obtained by atmospheric and room-temperature plasma (ARTP) mutagenesis from the original strain 1841, with bacillomycin L yield increasing from 244.22 to 415.89 mg/L. Mass spectrometry analysis identified that the main active compounds were C14-, C15-, and C16-bacillomycin L. Re-sequencing M86 showed that ARTP mutagenesis resulted in the effective mutations in sigma factors and ABC transporter proteins. Transcriptome sequencing further revealed the significant up-regulation of the bmyDABC and ytrBCC2DEF gene cluster involved in bacillomycin L synthesis and transporter, respectively, in M86. Bacillomycin L yield was further boosted to 676.47 mg/L after optimizing the fermentation medium by adjusting glycine, serine, and K<sub>2</sub>HPO<sub>4</sub> concentrations. Bacillomycin L exhibited broad inhibitory activity against 17 fungi and nine bacterial species. This investigation provides a foundation for bacillomycin L production and application.</p>","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"144"},"PeriodicalIF":4.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12183810/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144476019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Building a cell-factory in Crithidia fasciculata: a bio-sustainable system to produce high-value polyunsaturated fatty acids. 在束状蕨中建立细胞工厂:生产高价值多不饱和脂肪酸的生物可持续系统。
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-23 DOI: 10.1186/s12934-025-02760-7
Michela Cerone, Louise L Major, Terry K Smith
{"title":"Building a cell-factory in Crithidia fasciculata: a bio-sustainable system to produce high-value polyunsaturated fatty acids.","authors":"Michela Cerone, Louise L Major, Terry K Smith","doi":"10.1186/s12934-025-02760-7","DOIUrl":"10.1186/s12934-025-02760-7","url":null,"abstract":"<p><p>Fatty acids (FAs) are a class of diverse biomolecules that are essential for a wide variety of biological processes. Recently, ω-3 and ω-6 polyunsaturated FAs (PUFAs) have received a lot of attention for their benefit and essentiality to human health. Their demand is constantly increasing alongside the ever-decreasing availability of sources of natural PUFAs, such as some plants and marine ecosystems, which are now endangered by agribusiness and climate change. Most of the novel microbial synthetic platforms to produce ω-3 and ω-6 PUFAs (e.g. yeast, microalgae, oleaginous microorganisms, bacteria etc.) are costly. On the other hand, industrial processes based on chemical total synthesis of PUFAs is often challenging. Here, we propose an innovative and bio-sustainable method to make ω-3 and ω-6 PUFAs by building a cell-factory in Crithidia fasciculata, using genetic manipulation of endogenous FA desaturases and elongases, supplementation of the culture media with cheap sources of fats (such as used cooking oils), and culturing temperature reduction. In these unusual environments, C. fasciculata show high adaptability: the cells grow rapidly producing large biomass from small volumes of culture, scavenge and remodel unusual fat sources, as well as biosynthesising high value FAs and PUFAs de novo. By genetic manipulation, allowing overexpression of either the endogenous Δ6-desaturases or Δ4-desaturases, in conjunction with the endogenous elongase Elo4, high value ω-6 and ω-3 PUFAs were yielded to a maximum of 50% of the total FA content of the cells. These bioengineered C. fasciculata provide a low-cost and bio-sustainable platform to increase the production of essential PUFAs which can be introduced into the food chain at lower costs.</p>","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"142"},"PeriodicalIF":4.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12183914/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144476016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Harnessing an anti-CRISPR protein for powering CRISPR/Cas9-mediated genome editing in undomesticated Bacillus strains. 利用抗CRISPR蛋白在未驯化的芽孢杆菌菌株中为CRISPR/ cas9介导的基因组编辑提供动力。
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-23 DOI: 10.1186/s12934-025-02776-z
Man Su Kim, Da-Eun Jeong, Soo-Keun Choi
{"title":"Harnessing an anti-CRISPR protein for powering CRISPR/Cas9-mediated genome editing in undomesticated Bacillus strains.","authors":"Man Su Kim, Da-Eun Jeong, Soo-Keun Choi","doi":"10.1186/s12934-025-02776-z","DOIUrl":"10.1186/s12934-025-02776-z","url":null,"abstract":"<p><strong>Background: </strong>Wild-type Bacillus strains have significant industrial and medical value, but their effective utilization often requires strain improvement. The CRISPR/Cas9 system has become the primary tool for genome editing, allowing precise introduction of desired mutations at specific chromosomal locations. However, the practical application of CRISPR/Cas9 in most wild-type Bacillus strains remains challenging due to cellular toxicity resulting from Cas9/sgRNA activity. Therefore, controlling Cas9 toxicity is essential for the widespread application of the CRISPR/Cas9 system in wild-type Bacillus strains.</p><p><strong>Results: </strong>We employed AcrIIA4, an anti-CRISPR protein that inhibits the Cas9/sgRNA ribonucleoprotein complex from interacting with DNA, to mitigate Cas9/sgRNA-mediated toxicity, thereby enabling CRISPR/Cas9-based genome editing in wild-type strains. The newly constructed CRISPR/anti-CRISPR (CAC) plasmids harbor both cas9 and acrIIA4 genes controlled by the P<sub>spac</sub> and P<sub>xyl</sub> promoters, respectively, along with the repressor genes lacI and xylR. This design allows precise control of Cas9 activity through inducers. Xylose, which induces AcrIIA4 expression, effectively alleviated Cas9/sgRNA-mediated toxicity during transformation. Under xylose induction, the CAC plasmid led to a remarkable 139-fold increase in the transformation efficiency of wild-type Bacillus subtilis compared to a plasmid lacking anti-CRISPR. Meanwhile, IPTG induction promoted Cas9 expression, facilitating efficient genome editing. Upon IPTG induction, the genome editing efficiency in wild-type B. subtilis increased from 0 to 95.8% in transformants carrying the CAC plasmid. Importantly, our findings extend beyond B. subtilis, revealing that the anti-CRISPR protein dramatically enhanced transformation and genome editing efficiencies in Bacillus pumilus. Moreover, we demonstrated that the CAC system successfully enabled the generation of spo0A mutants in Bacillus mojavensis, Bacillus tequilensis, and Paenibacillus polymyxa.</p><p><strong>Conclusions: </strong>In this study, we developed a CAC system that utilizes the anti-CRISPR protein AcrIIA4 to reduce Cas9/sgRNA-mediated toxicity in Bacillus strains. This system enables precise control of AcrIIA4 and Cas9 expression through inducers, significantly enhancing the efficiency of transformation and genome editing in wild-type Bacillus strains. Therefore, the CAC system stands as a powerful tool to facilitate genome editing in diverse wild-type Bacillus species.</p>","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"143"},"PeriodicalIF":4.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12183898/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144476017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of a lysine biosensor for the dynamic regulation of cadaverine biosynthesis in E. coli. 用于动态调节大肠杆菌尸体碱合成的赖氨酸生物传感器的研制。
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-21 DOI: 10.1186/s12934-025-02772-3
Mingjie Li, Haorong Chen, Yukun Chen, Pengyu Chen, Shuchun Liu, Shuwen Liu, Tingyi Wen
{"title":"Development of a lysine biosensor for the dynamic regulation of cadaverine biosynthesis in E. coli.","authors":"Mingjie Li, Haorong Chen, Yukun Chen, Pengyu Chen, Shuchun Liu, Shuwen Liu, Tingyi Wen","doi":"10.1186/s12934-025-02772-3","DOIUrl":"10.1186/s12934-025-02772-3","url":null,"abstract":"<p><strong>Background: </strong>As one of the most promising monomers of biobased polyamides, cadaverine has wide industrial application prospects. However, in microbial cadaverine fermentation with glucose as the sole carbon source, the impaired coordination between precursor (lysine) utilization and cytotoxic cadaverine accumulation has been identified as the primary bottleneck limiting high-yield biosynthesis. Here, we developed a lysine biosensor in Escherichia coli to dynamically regulate cadaverine biosynthesis.</p><p><strong>Results: </strong>In this study, we developed a lysine biosensor based on the lysine transporter protein LysP, the transcription activator CadC, and the GFPuv gene under the control of the P<sub>cad</sub> promoter. However, the engineered lysine biosensor system had a low dynamic range and a narrow pH operating range. Therefore, a multilevel optimization strategy, which included the introduction of key point mutations and engineered promoter modifications, were introduced to improve the performance of the biosensor, resulting in significant improvements in the dynamic range and lysine response. Moreover, we engineered a cadaverine-producing E. coli strain by increasing the supply of the lysine precursor, overexpressing key cadaverine synthesis genes, and knocking out genes related to metabolic bypass. The lysine biosensor was subsequently implemented to dynamically regulate cadaverine biosynthesis, resulting in a 48.10% increase in the production titre (33.19 g/L) and a 21.2% increase in cell growth compared with those resulting from the strain with constitutive expression.</p><p><strong>Conclusion: </strong>This is the first report in which a lysine biosensor constructed in E. coli could dynamically regulate cadaverine synthesis to improve its yield and biomass. This strategy provides new insights into the metabolic engineering of lysine and its derivatives in E. coli.</p>","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"141"},"PeriodicalIF":4.3,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12182701/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144340236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Growth-independent CLA production by Bifidobacterium breve JKL2022 and the potential transcriptional regulatory role of TetR in linoleic acid isomerase expression. 短双歧杆菌JKL2022生长非依赖性CLA产生及TetR在亚油酸异构酶表达中的潜在转录调控作用
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-21 DOI: 10.1186/s12934-025-02766-1
Arxel G Elnar, Geun-Bae Kim
{"title":"Growth-independent CLA production by Bifidobacterium breve JKL2022 and the potential transcriptional regulatory role of TetR in linoleic acid isomerase expression.","authors":"Arxel G Elnar, Geun-Bae Kim","doi":"10.1186/s12934-025-02766-1","DOIUrl":"10.1186/s12934-025-02766-1","url":null,"abstract":"<p><strong>Background: </strong>Microbial production of conjugated linoleic acid (CLA) has garnered wide attention for the possibility to increase the CLA content in food products, therefore achieving higher concentrations of beneficial compounds for consumers. However, this approach has only been done using metabolically active cells, particularly in Bifidobacterium spp., thus being a major limitation given the anaerobic and fastidious nature of bifidobacteria. In this study, we aimed to investigate the capacity of Bifidobacterium breve JKL2022 (KACC81214BP) to convert free linoleic acid (LA) into CLA using growing cells and postbiotic preparations (washed cells and crude protein extracts) as catalysts.</p><p><strong>Results: </strong>Bifidobacterium breve JKL2022 demonstrated high CLA production as early as 6 h and continued to increase until 12-15 h of incubation. Moreover, CLA production was observed in JKL2022 washed cells (97.42 ± 3.64%) and crude protein fractions (33.87 ± 4.05%- 103.65 ± 2.70%) obtained after cell lysis, highlighting its superior CLA-converting activity compared to the B. breve JCM strains. In vitro CLA reaction conditions were optimal at pH 7.0, following the first-order kinetics within the first 5 min of reaction, and the extraction efficiency of the isopropanol-hexane protocol increased after adjusting the pH to 5.0-5.5. Finally, RT-qPCR and in silico analysis revealed a strong correlation between the expression levels of lai (JKL2022_00014) and tetR (JKL2022_00217) genes, suggesting the potential role of TetR in upregulating the lai gene expression in JKL2022 that could explain the LA conversion in washed JKL2022 cells.</p><p><strong>Conclusions: </strong>The ability of B. breve JKL2022 strain to convert free LA to CLA during growth, as well as using washed cells and crude protein extracts, suggests strain specificity and superior enzymatic activity. In addition to its potential application as a probiotic strain with CLA-enhancing properties, washed JKL2022 cells or crude protein extracts can be developed as postbiotic preparations for the same purpose.</p>","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"140"},"PeriodicalIF":4.3,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12181875/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144340237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Harnessing the power of Bacillus subtilis MR42: direct production of defined xylooligosaccharides (XOS) from corn stalks with enhanced prebiotic properties. 利用枯草芽孢杆菌MR42的力量:从具有增强益生元特性的玉米秸秆中直接生产确定的低聚木糖(XOS)。
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-20 DOI: 10.1186/s12934-025-02756-3
Lusha Wei, Shuo Sun, Yuan Chen, Xin An, Hanning Wu, Yifei Wu
{"title":"Harnessing the power of Bacillus subtilis MR42: direct production of defined xylooligosaccharides (XOS) from corn stalks with enhanced prebiotic properties.","authors":"Lusha Wei, Shuo Sun, Yuan Chen, Xin An, Hanning Wu, Yifei Wu","doi":"10.1186/s12934-025-02756-3","DOIUrl":"10.1186/s12934-025-02756-3","url":null,"abstract":"<p><p>The production of value-added bioproducts from renewable carbon sources has gained increasing attention in recent years. The aim of this study was to develop economical approaches for the production of prebiotic XOS with defined degree of polymerization (DP) by Bacillus subtilis MR42 from corn stalks. The MR42 strain has been genetically modified to delete the xynC gene, which enables it to convert xylan into specific XOS without generating xylose as a byproduct. Under optimal conditions, a high yield of XOS (703.4 mg/g xylan) was obtained. The purified XOS were further characterized using various techniques including TLC, HPLC, ESI-MS and <sup>1</sup>HNMR spectroscopy. The analysis revealed that the XOS primarily consisted of xylotriose (257 ± 0.14 mg/g XOS), xylotetraose (267 ± 0.24 mg/g XOS) and xylopentaose (289 ± 0.29 mg/g XOS), accounting for 81.3% of the total XOS. The prebiotic effect of XOS was evaluated by examining its impact on the growth of Lactobacillus, the production of short-chain fatty acids, and its antioxidant activity. B. subtilis MR42 showed a promising ability to produce XOS of DP 3-5, without the generation of xylose.</p>","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"139"},"PeriodicalIF":4.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12180186/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144336742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Correction: A highly efficient heterologous expression platform to facilitate the production of microbial natural products in Streptomyces. 更正:一个高效的异源表达平台,促进链霉菌微生物天然产物的生产。
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-19 DOI: 10.1186/s12934-025-02761-6
Xiuling Wang, Ping Lin, Qiyao Shen, Xueyan Feng, Shouying Xu, Qijun Zhang, Yang Liu, Cailing Ren, Daojing Yong, Qiong Duan, Liujie Huo, Youming Zhang, Gang Li, Jun Fu, Ruijuan Li
{"title":"Correction: A highly efficient heterologous expression platform to facilitate the production of microbial natural products in Streptomyces.","authors":"Xiuling Wang, Ping Lin, Qiyao Shen, Xueyan Feng, Shouying Xu, Qijun Zhang, Yang Liu, Cailing Ren, Daojing Yong, Qiong Duan, Liujie Huo, Youming Zhang, Gang Li, Jun Fu, Ruijuan Li","doi":"10.1186/s12934-025-02761-6","DOIUrl":"10.1186/s12934-025-02761-6","url":null,"abstract":"","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"138"},"PeriodicalIF":4.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12178030/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144333442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Screening of Red Sea- and Mediterranean Sea-derived Actinomycetes for Antimicrobial and Antitumor activities: LC-ESI-HRMS-based Metabolomics Study. 筛选红海和地中海来源的放线菌的抗菌和抗肿瘤活性:基于lc - esi - hrms的代谢组学研究
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-18 DOI: 10.1186/s12934-025-02759-0
Mahmoud A Abdel-Razik, Ahmed F Azmy, Tarek Dishisha, Ahmed O El-Gendy, Adlin Afzan, Nurkhalida Kamal, Ahmed Tawfike, Mohamed Sebak
{"title":"Screening of Red Sea- and Mediterranean Sea-derived Actinomycetes for Antimicrobial and Antitumor activities: LC-ESI-HRMS-based Metabolomics Study.","authors":"Mahmoud A Abdel-Razik, Ahmed F Azmy, Tarek Dishisha, Ahmed O El-Gendy, Adlin Afzan, Nurkhalida Kamal, Ahmed Tawfike, Mohamed Sebak","doi":"10.1186/s12934-025-02759-0","DOIUrl":"10.1186/s12934-025-02759-0","url":null,"abstract":"","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"136"},"PeriodicalIF":4.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12175458/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144326240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Toxicity reduction in continuous, high productivity ethanol fermentation by Parageobacillus thermoglucosidasius using in situ microbubble gas stripping. 原位微泡气提法降低热葡萄糖苷副杆菌连续高效乙醇发酵的毒性。
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-18 DOI: 10.1186/s12934-025-02754-5
Christopher Ibenegbu, William B Zimmerman, Michael Hines, Pratik D Desai, H C Hemaka Bandulasena, David J Leak
{"title":"Toxicity reduction in continuous, high productivity ethanol fermentation by Parageobacillus thermoglucosidasius using in situ microbubble gas stripping.","authors":"Christopher Ibenegbu, William B Zimmerman, Michael Hines, Pratik D Desai, H C Hemaka Bandulasena, David J Leak","doi":"10.1186/s12934-025-02754-5","DOIUrl":"10.1186/s12934-025-02754-5","url":null,"abstract":"<p><p>Ethanol concentrations above 4% (v/v) are required for economic bioethanol production due to the cost of recovery from dilute solutions. Although thermophilic bacteria have many potential advantages over Saccharomyces cerevisiae as process organisms for second generation bioethanol production, they are known to be less tolerant to ethanol, typically to concentrations less than 4% (v/v). To address this issue we have investigated the application of in situ gas-stripping of ethanol using microbubbles to increase the surface area per unit volume of gas, using fed-batch and continuous cultures of the engineered ethanologenic thermophile Parageobacillus thermoglucosidasius TM242. By using microbubbles generated at room temperature using a Desai-Zimmerman Fluid Oscillator, we initially operated a mixed batch and fed-batch fermentation, followed by a continuous fermentation and finally a chemostat fermentation, under conditions which would have generated in excess of 4% (v/v) ethanol. In all cases, gas stripping maintained the actual dissolved ethanol concentration below, or close to toxic levels. As the focus of this study was on demonstrating the efficiency of in situ microbubble gas stripping, to simplify the operation the latter two processes involved a combination of produced and supplemented ethanol, with the chemostat culture producing a nominal maximum 7.1% v/v based on glucose used (5.1-5.3% (v/v) based on ethanol recovered). This offers a practical way to produce second generation bio-ethanol from thermophiles.</p>","PeriodicalId":18582,"journal":{"name":"Microbial Cell Factories","volume":"24 1","pages":"137"},"PeriodicalIF":4.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12177972/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144326241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Liposome-encapsulated antibiotics and biosurfactants: an effective strategy to boost biofilm eradication in cooling towers. 脂质体封装抗生素和生物表面活性剂:促进冷却塔生物膜根除的有效策略。
IF 4.3 2区 生物学
Microbial Cell Factories Pub Date : 2025-06-18 DOI: 10.1186/s12934-025-02746-5
Marcus Vinícius Dias-Souza, Ihtisham Ul Haq, Sérgio Pagnin, Andrea Azevedo Veiga, Vera Lúcia Dos Santos
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