Producing D-Ribose from D-Xylose by Demonstrating a Pentose Izumoring Route.

D-Ribose plays fundamental roles in all living organisms and has been applied in food, cosmetics, health care, and pharmaceutical sectors. At present, D-ribose is predominantly produced by microbial fermentation based on the pentose phosphate pathway (PPP). However, this method suffers from a long synthetic pathway, severe growth defect of the host cell, and carbon catabolite repression (CCR).

A novel integrated approach employing Desertifilum tharense BERC-3 for efficient wastewater valorization and recycling for developing peri-urban algae farming system.

Peri-urban environments are significant reservoirs of wastewater, and releasing this untreated wastewater from these resources poses severe environmental and ecological threats. Wastewater mitigation through sustainable approaches is an emerging area of interest. Algae offers a promising strategy for carbon-neutral valorization and recycling of urban wastewater.

Improving Microbial Cell Factory Performance by Engineering SAM Availability.

Methylated natural products are widely spread in nature. -Adenosyl-l-methionine (SAM) is the secondary abundant cofactor and the primary methyl donor, which confer natural products with structural and functional diversification. The increasing demand for SAM-dependent natural products (SdNPs) has motivated the development of microbial cell factories (MCFs) for sustainable and efficient SdNP production.

Solid-state fermentation of corn straw using synthetic microbiome to produce fermented feed: The feed quality and conversion mechanism.

Straw is a typical biomass resource which can be converted into high nutritional value feed via microbial fermentation. The degradation and conversion of straw using a synthetic microbial community (SMC-8) was functionally investigated to characterise its nitrogen conversion and carbon metabolism. Four species of bacteria were found to utilise >20 % of the inorganic nitrogen within 15 h, and the ratio of the diameter of fungal transparent circles (D) to the diameter of the colony (d) of the four fungal species was >1.

Immobilization of rough morphotype Mycolicibacterium neoaurum R for androstadienedione production.

Objectives: Enhance the androstadienedione (Androst-1,4-diene-3,17-dione, ADD) production of rough morphotype Mycolicibacterium neoaurum R by repeated-batch fermentation of immobilized cells.

Results: M. neoaurum R was a rough colony morphotype variant, obtained from the routine plating of smooth M.

Employing Cationic Kraft Lignin as Additive to Enhance Enzymatic Hydrolysis of Corn Stalk.

A water-soluble cationic kraft lignin (named JLQKL), synthesized by combining quaternization and crosslinking reactions, was used as an additive to enhance the enzymatic hydrolysis of dilute-alkali-pretreated corn stalk. The chemical constitution of JLQKL was investigated by Fourier transform infrared spectroscopy, H nuclear magnetic resonance (NMR) and C NMR spectroscopy, and elemental analysis. The enzymatic hydrolysis efficiency of corn stalk at solid content of 10% (/) was significantly improved from 70.

Engineering an efficient whole-cell catalyst for d-allulose production from glycerol.

d-Allulose has many health-benefiting properties and therefore sustainably applied in food, pharmaceutical, and nutrition industries. The aldol reaction-based route is a very promising alternative to Izumoring strategy in d-allulose production. Remarkable studies reported in the past cannot get rid of by-product formation and costly purified enzyme usage.

Produce D-allulose from non-food biomass by integrating corn stalk hydrolysis with whole-cell catalysis.

D-allulose is a high-value rare sugar with many health benefits. D-allulose market demand increased dramatically after approved as generally recognized as safe (GRAS). The current studies are predominantly focusing on producing D-allulose from either D-glucose or D-fructose, which may compete foods against human.

Al-doped α-MnO coated by lignin for high-performance rechargeable aqueous zinc-ion batteries.

Zn/MnO batteries, one of the most widely studied rechargeable aqueous zinc-ion batteries, suffer from poor cyclability because the structure of MnO is labile with cycling. Herein, the structural stability of α-MnO is enhanced by simultaneous Al doping and lignin coating during the formation of α-MnO crystals in a hydrothermal process. Al enters the [MnO] octahedron accompanied by producing oxygen vacancies, and lignin further stabilizes the doped Al strong interaction in the prepared material, Al-doped α-MnO coated by lignin (L + Al@α-MnO).

Improving (2S)-naringenin production by exploring native precursor pathways and screening higher-active chalcone synthases from plants rich in flavonoids.

Flavonoids are a group of valuable compounds with a variety of health benefits. (2 S)-Naringenin is an important flavonoid skeleton, which can be tailored into almost all flavonoids. In this study, the Saccharomyces cerevisiae native precursor pathways were explored and higher-active CHSs from plants rich in flavonoids were screened.

Mycolicibacterium cell factory for the production of steroid-based drug intermediates.

Steroid-based drugs have been developed as the second largest medical category in pharmaceutics. The well-established route of steroid industry includes two steps: the conversion of natural products with a steroid framework to steroid-based drug intermediates and the synthesis of varied steroid-based drugs from steroid-based drug intermediates. The biosynthesis of steroid-based drug intermediates from phytosterols by Mycolicibacterium cell factories bypasses the potential undersupply of diosgenin in the traditional steroid chemical industry.

Recent Advances in Producing Sugar Alcohols and Functional Sugars by Engineering .

The sugar alcohols and functional sugars have wide applications in food, pharmaceutical, and chemical industries. However, the smaller quantities of natural occurring sugar alcohols and functional sugars restricted their applications. The enzymatic and whole-cell catalyst production is emerging as the predominant alternatives.

Coupling metabolic addiction with negative autoregulation to improve strain stability and pathway yield.

Metabolic addiction, an organism that is metabolically addicted with a compound to maintain its growth fitness, is an underexplored area in metabolic engineering. Microbes with heavily engineered pathways or genetic circuits tend to experience metabolic burden leading to degenerated or abortive production phenotype during long-term cultivation or scale-up. A promising solution to combat metabolic instability is to tie up the end-product with an intermediary metabolite that is essential to the growth of the producing host.

Optimizing Oleaginous Yeast Cell Factories for Flavonoids and Hydroxylated Flavonoids Biosynthesis.

Plants possess myriads of secondary metabolites with a broad spectrum of health-promoting benefits. To date, plant extraction is still the primary route to produce high-value natural products which inherently suffers from economics and scalability issues. Heterologous expression of plant biosynthetic gene clusters in microbial host is considered as a feasible approach to overcoming these limitations.

Process optimization for the production of high-concentration ethanol with Scenedesmus raciborskii biomass.

Scenedesmus raciborskii WZKMT was subjected to fed-batch enzymatic hydrolysis and fermentation to facilitate the saccharification of high-solid-loading substrate for high-concentration ethanol. In this work, process factors affecting enzymatic hydrolysis, including enzyme loading, temperature, pH, and solid loading, were optimized. Results showed that 58.

Coupling feedback genetic circuits with growth phenotype for dynamic population control and intelligent bioproduction.

Metabolic engineering entails target modification of cell metabolism to maximize cell's production potential. Due to the complexity of cell metabolism, feedback genetic circuits have emerged as basic tools to combat metabolic heterogeneity, enhance microbial cooperation as well as boost cell's productivity. This is generally achieved by applying social reward-punishment rules to eliminate cheaters and reward winners in a mixed cell population.

Combining 26s rDNA and the Cre-loxP System for Iterative Gene Integration and Efficient Marker Curation in Yarrowia lipolytica.

Conventional plasmid-based gene expression tends to introduce genetic instability and gene copy number variations that lead to degenerated production. The limited number of auxotrophic markers in Yarrowia lipolytica also restricts our ability to perform iterative genetic modifications and manipulate long gene clusters. To overcome these limitations, we combined the high recombination efficiency of the Cre-loxP system and the high integration rate of 26s rDNA, and developed a versatile framework to iteratively integrate multicopy metabolic pathways in Y.

Improving bioconversion of eugenol to coniferyl alcohol by in situ eliminating harmful HO.

Coniferyl alcohol is a valuable chemical. However, the current approaches to obtain coniferyl alcohol are either unefficient or expensive. Penicillium simplicissimum vanillyl alcohol oxidase (PsVAO) can be used to produce coniferyl alcohol.

Spatial organization of silybin biosynthesis in milk thistle [Silybum marianum (L.) Gaertn].

Silymarin is a collection of compounds extracted from the medicinal herb milk thistle, among which silybin is the major flavonolignan. However, the biosynthesis pathway of silybin remains unclear. In this study, biomimetic reactions demonstrated that silybin can be synthesized from coniferyl alcohol and taxifolin by the action of peroxidase.

Engineering of an H O auto-scavenging in vivo cascade for pinoresinol production.

Pinoresinol is a natural lignan with a high market value that has potential pharmacological and food supplement applications. Pinoresinol is currently isolated from plants, which suffers from low efficiency and yield. To produce pinoresinol from inexpensive and industrially available eugenol, an in vivo enzymatic cascade composed of vanillyl alcohol oxidase and peroxidase was designed, which scavenges H O automatically and eliminates protein purification and cofactor addition.

[Effects of transporter Agp1p ubiquitination on nitrogen utilization in Saccharomyces cerevisiae].

Objective: The purpose of this work is to studythe effects of ubiquitination of key nitrogen transporter Agp1p on nitrogen utilization in Saccharomyces cerevisiae.

Methods: The ubiquitination detection vector to examine the ubiquitination process of Agp1p was constructed based on the bimolecular fluorescence complementation technology. The site-directed mutagenesis on the potential ubiquitination sites were performed to verify the effect on its ubiquitination regulation and nitrogen utilization.

A simple procedure for protein ubiquitination detection in Saccharomyces cerevisiae: Gap1p as an example.

We established a simple procedure for protein ubiquitination detection in Saccharomyces cerevisiae. Enhanced green fluorescent protein (EGFP) was split into two parts, an N-terminal (GN) and a C-terminal (GC) region. The fusion fragments GN-UBI3 and multi-cloning site (MCS)-GC were inserted into the vector pY26-TEF/GPD, resulting in pUbDetec16.