Biotechnology Notes最新文献

{"title":"Synthetic biology landscape in the UK","authors":"Georg K.A. Wachter ,&nbsp;Olivia Gallup ,&nbsp;James Bayne ,&nbsp;Louise Horsfall","doi":"10.1016/j.biotno.2022.07.002","DOIUrl":"10.1016/j.biotno.2022.07.002","url":null,"abstract":"<div><p>The UK is home to a vibrant and diverse synthetic biology community. Many of its successes in research innovation and technological commercialisation can be attributed to a strong base of dedicated academics, investors, industrial leadership, and policymakers. Here, we give an overview of the organisations making up the network that have been key to these successes and the roles that they play within the different levels of the community. We start with a brief history of synthetic biology in the UK and continue by describing the progression of the societies and institutions that were set up, with particular focus on the UK's active student and entrepreneurship scene, as well as centres of research. We then contextualise the UK's growing bioeconomy, detailing government trajectories of planned innovation and how these coincide with research translation. The path to commercialisation for researchers is put into comparison to that of the US, the world leader in synthetic biology and its translation, highlighting aspects that differentiate the UK globally. Finally, we conclude with a bright outlook on the current velocity of progress and the state of the community.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 70-74"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000071/pdfft?md5=8611cf0d49012fcd702dff39b1e10dcb&pid=1-s2.0-S2665906922000071-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91538793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of an ultra-strong PtacM promoter via engineering the core-element spacer and 5′ untranslated region for versatile applications in Corynebacterium glutamicum","authors":"Yan Du ,&nbsp;Miaomiao Wang ,&nbsp;Claudia Chen Sun ,&nbsp;Huimin Yu","doi":"10.1016/j.biotno.2022.11.001","DOIUrl":"10.1016/j.biotno.2022.11.001","url":null,"abstract":"<div><p>As one of the most important synthetic biology elements in transcriptional regulation, promoters play irreplaceable roles in metabolic engineering. For the industrial microorganism <em>Corynebacterium glutamicum</em>, both the construction of a promoter library with gradient strength and the creation of ultra-strong promoters are essential for the production of target enzymes and compounds. In this work, the spacer sequence (both length and base) between the −35 and −10 regions, and the 5′-terminal untranslated region (5′UTR) were particularly highlighted to investigate their contributions to promoter strength. We constructed a series of artificially induced promoters based on the classical tac promoter using <em>C. glutamicum</em> ATCC13032 as the host. Here, we explored the effect of sequence length between the −35 and −10 regions on the strength of the tac promoter, and found that the mutant with 15 nt spacer length (PtacL15) was transcriptionally stronger than the classic Ptac (16 nt); subsequently, based on PtacL15, we explored the effect of the nucleotide sequence in the spacer region on transcriptional strength, and screened the strongest PtacL15m-110 (GAACAGGCTTTATCT), and PtacL15m-87 (AGTCGCTAAGACTCA); finally, we investigated the effect of the length of the 5′-terminal untranslated region (5′UTR) and screened out the optimal PtacM4 mutant with a 5′UTR length of 32 nt. Based on our new findings on the optimal spacer length (15 nt), nucleotide sequence (AGTCGCTAAGACTCA), and 5′UTR (truncated 32 nt), an ultra-strong PtacM, whose transcriptional strength was about 3.25 times that of the original Ptac, was obtained. We anticipate that these promoters with gradient transcriptional strength and the ultra-strong PtacM will play an important role in the construction of recombinant strains and industrial production.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 88-96"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000125/pdfft?md5=7e38e4ed58f11fe6f762eb6c4d393b76&pid=1-s2.0-S2665906922000125-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84059005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Immunomodulatory effects of Abelmoschus esculentus water extract through MAPK and NF-κB signaling in RAW 264.7 cells","authors":"Min Nyeong Ko ,&nbsp;Su Bin Hyun ,&nbsp;Keun Jae Ahn ,&nbsp;Chang-Gu Hyun","doi":"10.1016/j.biotno.2022.05.002","DOIUrl":"10.1016/j.biotno.2022.05.002","url":null,"abstract":"<div><p>During the current COVID-19 pandemic, the world is facing a new, highly contagious virus that suppresses innate immunity as one of its early virulence mechanisms. Therefore, finding new methods to enhance innate immunity is a promising strategy to attenuate the effects of this major global health problem. With the aim of characterizing bioactive ingredients as immune-enhancing agents, this study focuses on <em>Abelmoschus esculentus</em> (okra), which has several previously demonstrated bioactivities. Firstly, we investigated the immune-stimulatory effects of okra leaf ethanol extract (OLE) and okra leaf water extract (OLW) on nitric oxide (NO) production in macrophages. OLE significantly decreased nitrite accumulation in LPS-stimulated RAW 264.7 cells, indicating that it potentially inhibited NO production in a concentration-dependent manner. In contrast, OLW significantly enhanced the production of prostaglandin E₂ (PGE₂), tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and NO in a dose-dependent manner. OLW also increased the expression levels of NO synthase (iNOS) and cyclooxygenase (COX)-2, potentially explaining the OLW-induced increase in NO and PGE₂ production. In addition, OLW stimulated the phosphorylation of mitogen-activated protein kinases (MAPKs; ERK, p38, and JNK) as well as the activation and subsequent nuclear translocation of nuclear factor κB (NF-κB). This indicated that OLW activates macrophages to secrete PGE₂, TNF-α, IL-1β, and NO, inducing iNOS and COX-2 expression via activation of the NF-κB and MAPK signaling pathways. In conclusion, our results demonstrate that OLW can effectively promote the activation of macrophages, suggesting that OLW may possess potent immunomodulatory effects and should be explored as a potential health-promoting materials to boost the immune system.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 38-44"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000046/pdfft?md5=6cd271c83623aa7f423fbbc004ef9174&pid=1-s2.0-S2665906922000046-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86851029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthetic biology in Europe: current community landscape and future perspectives","authors":"Stefano Donati ,&nbsp;Içvara Barbier ,&nbsp;Daniela A. García-Soriano ,&nbsp;Stefano Grasso ,&nbsp;Paola Handal-Marquez ,&nbsp;Koray Malcı ,&nbsp;Louis Marlow ,&nbsp;Cauã Westmann ,&nbsp;Adam Amara","doi":"10.1016/j.biotno.2022.07.003","DOIUrl":"10.1016/j.biotno.2022.07.003","url":null,"abstract":"<div><p>Synthetic biology has captivated scientists' imagination. It promises answers to some of the grand challenges society is facing: worsening climate crisis, insufficient food supplies for ever growing populations, and many persisting infectious and genetic diseases. While many challenges remain unaddressed, after almost two decades since its inception a number of products created by engineered biology are starting to reach the public. European scientists and entrepreneurs have been participating in delivering on the promises of synthetic biology. Associations like the European Synthetic Biology Society (EUSynBioS) play a key role in disseminating advances in the field, connecting like-minded people and promoting scientific development. In this perspective article, we review the current landscape of the synthetic biology community in Europe, discussing the state of related academic research and industry. We also discuss how EUSynBioS has helped to build bridges between professionals across the continent.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 54-61"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000083/pdfft?md5=303b84fd171ff4200000d35d06edae0d&pid=1-s2.0-S2665906922000083-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80524888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resveratrol production of a recombinant Scheffersomyces stipitis strain from molasses","authors":"Yuma Kobayashi ,&nbsp;Kentaro Inokuma ,&nbsp;Mami Matsuda ,&nbsp;Akihiko Kondo ,&nbsp;Tomohisa Hasunuma","doi":"10.1016/j.biotno.2021.11.001","DOIUrl":"10.1016/j.biotno.2021.11.001","url":null,"abstract":"<div><p>Resveratrol is a plant-derived aromatic compound with beneficial properties and it is required to develop a resveratrol production process from inexpensive biomass feedstocks. Here, we investigated the potential of <em>Scheffersomyces stipitis</em>, a non-conventional yeast with the capacity to utilize a wide range of sugars, to produce resveratrol from molasses, which is a by-product of sugar refineries. The <em>S. stipitis</em> strain metabolically engineered for resveratrol production produced resveratrol from 60 g/L mixed sugar (sucrose, glucose, and fructose), while its resveratrol titer decreased as the proportions of glucose and fructose increased. Sucrose consumption of the <em>S. stipitis</em> strain was clearly suppressed by the coexistence of glucose, fructose, and even ethanol. Quantitative analysis of intracellular metabolites involved in resveratrol biosynthesis using capillary electrophoresis time-of-flight mass spectrometry revealed that the composition of these sugars has a significant effect on the intracellular accumulation of glycolytic metabolites and AMP, which is an important factor involved in some cellular metabolic responses. Furthermore, the <em>S. stipitis</em> strain produced 1076 ± 167 mg/L of resveratrol in the fermentation with commercial sugarcane molasses (120 g/L of total sugars) as the substrate. To our knowledge, this is the first report on carbon catabolite repression in S<em>. stipitis</em> caused by the coexistence of sucrose, glucose, and fructose and resveratrol production from molasses. These results indicate great potential of the cost-effective resveratrol production process from molasses substrates using recombinant <em>S. stipitis</em>.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 1-7"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266590692100009X/pdfft?md5=7156ba008f96438394bb84a2cb448c3f&pid=1-s2.0-S266590692100009X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75561401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of destabilized mCherry fluorescent proteins for applications in the model yeast Saccharomyces cerevisiae","authors":"Yu Chyuan Heng ,&nbsp;Jee Loon Foo","doi":"10.1016/j.biotno.2022.12.001","DOIUrl":"10.1016/j.biotno.2022.12.001","url":null,"abstract":"<div><p>Fluorescent proteins are widely used molecular reporters in studying gene expression and subcellular protein localization. To enable the monitoring of transient cellular events in the model yeast <em>Saccharomyces cerevisiae</em>, destabilized green and cyan fluorescent proteins have been constructed. However, their co-utilization is limited by an overlap in their excitation and emission spectra. Although red fluorescent protein is compatible with both green and cyan fluorescent proteins with respect to spectra resolution, a destabilized red fluorescent protein is yet to be constructed for applications in <em>S. cerevisiae</em>. To realize this, we adopted a degron-fusion strategy to prompt destabilization of red fluorescent protein. Specifically, we fused two degrons derived from Cln2, a G₁-specific cyclin that mediates cell cycle transition, to the N- or C-terminus of mCherry to generate four destabilized fluorescent proteins that are soluble and functional in <em>S</em>. <em>cerevisiae</em>. Importantly, the four mCherry fluorescent proteins are highly differential with regards to fluorescence half-life and intensity, which provides a greater choice of tools available for the study of dynamic gene expression and transient cellular processes in the model yeast.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 108-112"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000186/pdfft?md5=df705722db51df9e97bca5a8eb9484d7&pid=1-s2.0-S2665906922000186-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79992855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Building the SynBio community in the Czech Republic from the bottom up: You get what you give","authors":"Stanislav Juračka ,&nbsp;Barbora Hrnčířová ,&nbsp;Barbora Burýšková ,&nbsp;Daniel Georgiev ,&nbsp;Pavel Dvořák","doi":"10.1016/j.biotno.2022.11.002","DOIUrl":"10.1016/j.biotno.2022.11.002","url":null,"abstract":"<div><p>Given its highly innovative character and potential socioeconomic impact, Synthetic Biology is often ranked among prominent research areas and national research priorities in developed countries. The global evolution of this field is proceeding by leaps and bounds but its development at the level of individual states varies widely. Despite their current satisfactory economic status, the majority of 13, mostly post-communist, countries that entered the European Union family in and after 2004 (EU13) have long overlooked the blossoming of Synthetic Biology. Their prioritized lines of research have been directed elsewhere or “<em>Synthetic Biology</em>” did not become a widely accepted term to encompass their bioengineering and biotechnology domains. The Czech Republic is not an exception. The local SynBio mycelium already exists but is mainly built bottom-up through the activities of several academic labs, iGEM teams, and spin-off companies. In this article, we tell their individual stories and summarize the prerequisites that allowed their emergence in the Czech academic and business environment. In addition, we provide the reader with a brief overview of laboratories, research hubs, and companies that perform biotechnology and bioengineering-oriented research and that may be included in a notional “shadow SynBio community” but have not yet adopted <em>Synthetic Biology</em> as a unifying term for their ventures. We also map the current hindrances for a broader expansion of Synthetic Biology in the Czech Republic and suggest possible steps that should lead to the maturity of this fascinating research field in our country.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 124-134"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000137/pdfft?md5=6ea8a031cbd43c45b251d56089f4e241&pid=1-s2.0-S2665906922000137-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87930756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ribosome purification from Escherichia coli by ultracentrifugation","authors":"Yi Cui ,&nbsp;Xinjie Chen ,&nbsp;Ze Wang ,&nbsp;Yuan Lu","doi":"10.1016/j.biotno.2022.12.003","DOIUrl":"10.1016/j.biotno.2022.12.003","url":null,"abstract":"<div><p>With more and more researchers conducting extensive research on all aspects of ribosomes, how to extract ribosomes with good effect and high activity has become a fundamental problem. In this article, <em>Escherichia coli</em> A19, MRE600, and JE28 cells often mentioned in the literature and ordinary <em>E. coli</em> BL21(DE3) cells were used to extract ribosomes by ultracentrifugation. The purpose was to study whether the ultracentrifugation method can be applied to extract effective ribosomes, and whether the ribosome extracts from different cells were different. The extracted ribosomes were validated by RNA electrophoresis, SDS-PAGE, PURE system, and mass spectrometry. The validation experiment results showed that ribosomes from these four cells had different effects. The success of the experiment confirmed that effective ribosomes could be extracted from <em>E. coli</em> by ultracentrifugation, which laid a good foundation for researchers to carry out further applications on ribosomes.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 118-123"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000198/pdfft?md5=b8a0277c40a42d6e56b858c408e6e958&pid=1-s2.0-S2665906922000198-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84855345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"2022 The 1st Western China symposium on the international frontier of synthetic biomanufacturing","authors":"Yaqi Kang,&nbsp;Ruoshi Luo,&nbsp;Dachun Gong,&nbsp;Yongkui Zhang,&nbsp;Dan Wang","doi":"10.1016/j.biotno.2022.12.004","DOIUrl":"10.1016/j.biotno.2022.12.004","url":null,"abstract":"<div><p>The 1st western China symposium on the international frontier of synthetic biomanufacturing was successfully held on July 8–10 in 2022. The conference is firstly launched by Professor Dan Wang in Chongqing University, and will be organized regularly every year by different universities in western China. The aim of this symposium is to show the cutting-edge knowledge of the synthetic biology developed in China and worldwide, provide a chance to meet international colleagues, and also to promote the academic and economic development of western China. Due to COVID-19, the 2022 symposium was masterfully delivered on the combination of online and offline operation, and the organisers must be commended for a really excellent and interactive meeting.</p><p>The content of the conference involves two modules of synthetic biology and green biomanufacturing, covering eight aspects: synthetic biology, metabolic engineering, biological process engineering, industrial microbial breeding, biocatalysis and biotransformation, synthetic bio-materials, bio-medicine and biological separation engineering. More than 400 representatives were invited to gather together to exchange the latest research results and development trends in the field of synthetic biology and biomanufacturing. There was a significant focus on the younger scientists, both in terms of oral reports and posters. There were many excellent invited lectures and sessions beyond the remit of this short summary, including “Pharmaceutical manufacturing by biological methods” by Yuguo Zheng, Academician of the Chinese Academy of Engineering (CAE) Member of China, and a lecture “The third generation of biological manufacturing: preparing chemicals with CO₂ as raw material” by Tianwei Tan, Academician of the CAE Member of China, a lecture on the biotransformation and green separation of natural products by Prof. Huizhou Liu, a lecture of the synthetic biology of Halophilic bacteria by Prof. Guoqiang Chen, a lecture of design principles to engineer yeasts as microbial factories by Ass. Prof. Zengyi Shao in Iowa State University, and a outstanding overview of the development of synthetic biology from basic research to industrialization in China to list just six.</p><p>In this article we will cover some pertinent areas of synthetic biology and biomanufacturing amidst the unavoidable spectra of COVID-19.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 113-117"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000204/pdfft?md5=923d8f870d395c8dd672cddcd68a7cd3&pid=1-s2.0-S2665906922000204-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77117058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Model-based dynamic engineering of Escherichia coli for N-acetylglucosamine overproduction","authors":"Jiangong Lu ,&nbsp;Yaokang Wu ,&nbsp;Chen Deng ,&nbsp;Yanfeng Liu ,&nbsp;Xueqin Lv ,&nbsp;Jianghua Li ,&nbsp;Guocheng Du ,&nbsp;Long Liu","doi":"10.1016/j.biotno.2022.02.001","DOIUrl":"10.1016/j.biotno.2022.02.001","url":null,"abstract":"<div><p>N-acetylglucosamine (GlcNAc), a glucosamine derivative, has a wide range of applications in pharmaceutical fields, and there is an increasing interest in the efficient production of GlcNAc genetic engineered bacteria. In this work, <em>Escherichia coli</em> ATCC 25947 (DE3) strain was engineered by a model-based dynamic regulation strategy achieving GlcNAc overproduction. First, the GlcNAc synthetic pathway was introduced into <em>E. coli</em>, and through flux balance analysis of the genome-scale metabolic network model, metabolic engineering strategies were generated to further increase GlcNAc yield. Knock-out of genes <em>poxB</em> and <em>ldhA,</em> encoding pyruvate oxidase and lactate dehydrogenase, increased GlcNAc titer by 5.1%. Furthermore, knocking out N-acetylmuramic acid 6-phosphate etherase encoded by <em>murQ</em> and enhancing glutamine synthetase encoded by <em>glnA</em> gene further increased GlcNAc titer to 130.8 g/L. Analysis of metabolic flux balance showed that GlcNAc production maximization requires the strict dynamic restriction of the reactions catalyzed by <em>pfkA</em> and <em>zwf</em> to balance cell growth and product synthesis. Hence, a dynamic regulatory system was constructed by combining the CRISPRi (clustered regularly interspaced short palindromic repeats interference) system with the lactose operon <em>lacI</em> and the transcription factor pdhR, allowing the cell to respond to the concentration of pyruvate and IPTG to dynamically repress <em>pfkA</em> and <em>zwf</em> transcription. Finally, the engineered bacteria with the dynamic regulatory system produced 143.8 g/L GlcNAc in a 30-L bioreactor in 55 h with a yield reaching 0.539 g/g glucose. Taken together, this work significantly enhanced the GlcNAc production of <em>E. coli.</em> Moreover, it provides a systematic, effective, and universal way to improve the synthetic ability of other engineered strains.</p></div>","PeriodicalId":100186,"journal":{"name":"Biotechnology Notes","volume":"3 ","pages":"Pages 15-24"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2665906922000010/pdfft?md5=d9ac951ebd53945cab58d872f59424a8&pid=1-s2.0-S2665906922000010-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85337379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}