Triune Engineering Approach for (+)-valencene Overproduction in Yarrowia lipolytica.

The sesquiterpene (+)-valencene, with its flavor and diverse biological functions, holds promise for applications in the food, fragrance, and pharmaceutical industries. However, the low concentration in nature and high cost of extraction limit its application. This study aimed to construct a microbial cell factory to efficiently produce (+)-valencene.

Promoter engineering with programmable upstream activating sequences in Aspergillus Niger cell factory.

Background: Aspergillus niger is an important industrial filamentous fungus used to produce organic acids and enzymes. A wide dynamic range of promoters, particularly strong promoters, are required for fine-tuning the regulation of gene expression to balance metabolic flux and achieve the high yields of desired products. However, the limited understanding of promoter architectures and activities restricts the efficient transcription regulation of targets in strain engineering in A.

Semirational Protein Engineering of a Decarboxylative Aldolase for Regiodivergent and Stereodivergent Synthesis of Cyclic Imino Acids.

Aldolases are powerful C-C bond-forming enzymes for asymmetric organic synthesis because of their supreme stereoselectivity, diverse electrophiles and nucleophiles, and promising scalability. Stereodivergent engineering of aldolases to tune the selectivity for the synthesis of stereoisomers of chiral molecules is highly desirable but has rarely been reported. This study documented the semirational engineering of the decarboxylative aldolase UstD with the focused rational iterative site-specific mutagenesis (FRISM) strategy to perform a C-C bond-forming reaction with dione electrophiles.

Berk Alleviated Atherosclerosis Symptoms via Nuclear Factor-Kappa B-Mediated Inflammatory Response in ApoE Mice.

Background: Atherosclerosis, a persistent inflammatory disease marked by the presence of atherosclerotic plaques or fibrous plaques, is a significant contributor to the onset of the development of cardiovascular disease. Berk contains various active ingredients that have anti-inflammatory, antioxidant, and hypolipidemic properties. Nevertheless, the potential effects of on atherosclerosis have not been systematically reported.

Computational Study on the Reaction Mechanism of 5-Enolpyruvylshikimate-3-phosphate Synthase from Nicotiana Tabacum.

5-Enolpyruvylshikimate-3-phosphate synthase (EPSPS) catalyzes the conversion of 5-enolpyruvate (PEP) and shikimic acid phosphate (S3P) to 5-enolpyruvylshikimic acid-3-phosphate (EPSP), releasing inorganic phosphate. This reaction is the sixth step of the shikimate pathway, which is a metabolic pathway used by microorganisms and plants for the biosynthesis of aromatic amino acids and folates but not in mammals. In the present study, the detailed reaction mechanism of EPSPS from Nicotiana tabacum (NtEPSPS) is revealed by quantum chemical calculations with the cluster approach.

Development of a microbiome for phenolic metabolism based on a domestication approach from lab to industrial application.

Despite a lot of efforts devoted to construct efficient microbiomes, there are still major obstacles to moving from the lab to industrial applications due to the inapplicability of existing technologies or limited understanding of microbiome variation regularity. Here we show a domestication strategy to cultivate an effciient and resilient functional microbiome for addressing phenolic wastewater challenges, which involves directional domestication in shaker, laboratory water test in small-scale, gas test in pilot scale, water test in pilot scale, and engineering application in industrial scale. The domestication process includes the transition from water to gas, which provided complex transient environment for screening of a more adaptable and robust microbiome, thereby mitigating the performance disparities encountered when transitioning from laboratory experimentation to industrial engineering applications.

High-efficiency production of plant-derived pigment dopaxanthin in Escherichia coli by combination engineering.

Background: Dopaxanthin is a natural pigment betaxanthins family member with the highest antioxidant and free radical scavenging activities. However, its relatively low content in plants limited the wide range of applications. Cost-efficient microbial production, therefore, showed an attractive alternative.

Reprograming the Carbon Metabolism of Yeast for Hyperproducing Mevalonate, a Building Precursor of the Terpenoid Backbone.

Utilization of microbial hosts to produce natural plant products is regarded as a promising and sustainable approach. However, achieving highly efficient production of terpenoids using microorganisms remains a significant challenge. Here, mevalonate, a building block of terpenoids, was used as a demo product to explore the potential metabolic constraints for terpenoid biosynthesis in .

Against Colitis-Associated Cancer Through the Suppression of the PI3K/AKT/COX-2 Pathway and Inhibition of PGE2 Production in Mice.

Background: (BD) is a newly discovered edible mushroom with rich nutritional components. This study presents a thorough analysis of the components of BD, examining its inhibitory effects and the underlying mechanisms by which BD influences colitis-associated cancer (CAC).

Methods: AOM/DSS-induced CAC mice (male C57BL/6) were used, and a histopathological analysis, intestinal microbiota assessment, and metabolomics profiling were carried out, as well as an evaluation of relevant proteins and factors, to investigate the CAC-inhibitory effects of BD.

Ginsenosides From Panax ginseng Improves Hepatic Lipid Metabolism Disorders in HFD-Fed Rats by Regulating Gut Microbiota and Cholesterol Metabolism Signaling Pathways.

A high-fat diet (HFD) is often associated with hepatic lipid metabolism disorders, leading to dysfunction in multiple body systems. Ginsenosides derived from Panax ginseng have been reported to possess potential effects in ameliorating lipid metabolism disorders; however, their underlying mechanisms remain insufficiently explored. This study aims to investigate the bioactivities of ginsenosides in combating lipid metabolism disorders and obesity, with a focus on their mechanisms involving the cholesterol metabolism signaling pathway and gut microbiota.

The electrochemical ion membrane system (EIMs) enhanced light reactions of photosynthesis with intermittent electrical stimulation.

Despite the widespread application of electrochemical systems in bioproduction, their detailed effects on photosynthetic organisms remain to be explored. In this study, a three-chamber electrochemical ion membrane system (EIMs) was optimized for minimizing carbon resource interference in the cathode chamber, thereby elucidating the role of EIMs in the light reactions of photosynthesis. By applying intermittent electrical stimulation, the photosynthetic activity of microalgae was enhanced, manifesting as the promoted accumulation of intracellular ATP and NADPH, while allowing the collection of hydrogen and oxygen as by-products.

Polypeptide of Inonotus hispidus extracts alleviates periodontitis through suppressing inflammatory bone loss.

This study aimed to characterize and evaluate the effects of a novel polypeptide isolated from Inonotus hispidus (IH) against periodontitis. The polypeptides extracted and purified from the fruiting body of IH had a uniform molar mass, including 23 types of peptides. IH polypeptide (IHP) exerted antimicrobial activity against Porphyromonas gingivalis (P.

Transcriptome analysis of Aureobasidium pullulans BL06 and identification of key factors affecting pullulan production.

Pullulan, a versatile water-soluble polysaccharide, is widely used across various industries. To minimize byproduct interference, Aureobasidium pullulans BL06ΔPMAs was engineered, resulting in a higher yield and a lower molecular weight (MW) than the parent strain A. pullulans BL06.

Functional redundancy enables a simplified consortium to match the lignocellulose degradation capacity of the original consortium.

The relationship between structure and function in microbial communities is intriguing and complex. In this study, we used single-carbon source domestication to derive consortium YL from the straw-degrading consortium Y. Y and YL exhibited similar straw degradation capabilities, yet YL harbored only half the species diversity of Y, with distinct dominant species.

Study on the Mechanism of Polysaccharide in Reducing Depression-like Behavior in Mice.

Background/objectives: Depression is a prevalent worldwide mental health disorder that inflicts significant harm to individuals and society. is an edible fungus that contains a variety of nutrients, including polysaccharides. This study aims to investigate the monosaccharide composition and molecular weight of the polysaccharide (DDP-B1), followed by an exploration of its antidepressant effects in chronic unpredictable mild stress (CUMS) mice.

A yeast surface display platform for screening of non-enzymatic protein secretion in Kluyveromyces lactis.

Enhancing the secretion of recombinant proteins, particularly non-enzymatic proteins that predominate in food and pharmaceutic protein products, remains a significant challenge due to limitations in high-throughput screening methods. This study addresses this bottleneck by establishing a yeast surface display system in the food-grade microorganism Kluyveromyces lactis, enabling efficient display of model target proteins on the yeast cell surface. To assess its potential as a universal high-throughput screening tool for enhanced non-enzymatic protein secretion, we evaluated the consistency between protein display levels and secretion efficiency under the influence of various genetic factors.

Multi-omic profiling of a novel Myrothecium species reveals its potential mechanism of lignin degradation.

Lignin utilization is one of the key challenges in the valorziation of lignocellulose. Filamentous fungi are promising candidates for lignin degradation and mineralization. However, novel lignin-degrading species are underexplored and the mechanism of lignin degradation is not fully understood.

Comprehensive screening of industrially relevant components at genome scale using a high-quality gene overexpression collection of Corynebacterium glutamicum.

Development of efficient microbial strains for biomanufacturing requires deep understanding of the biology and functional components responsible for the synthesis, transport, and tolerance of the target compounds. A high-quality controllable gene overexpression strain collection was constructed for the industrial workhorse Corynebacterium glutamicum covering 99.7% of its genes.

Quantum chemical studies of the reaction mechanisms of enzymatic CO conversion.

Enzymatic capture and conversion of carbon dioxide (CO) into value-added chemicals are of great interest in the field of biocatalysis and have a positive impact on climate change. The quantum chemical methods, recognized as valuable tools for studying reaction mechanisms, have been widely employed in investigating the reaction mechanisms of the enzymes involved in CO utilization. In this perspective, we review the mechanistic studies of representative enzymes that are either currently used or have the potential for converting CO, utilizing the quantum chemical cluster approach and the quantum mechanical/molecular mechanical (QM/MM) method.

[Efficient expression regulation of acetohydroxyacid synthase for production of branched-chain amino acids in ].

is a major workhorse in the industrial production of branched-chain amino acids (BCAAs). The acetohydroxyacid synthase (AHAS) encoded by is a key enzyme in the biosynthesis of BCAAs. Enhancing AHAS expression is essential for engineering BCAA producers.