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Membrane and co-culture engineering for high-level curcumin production in Escherichia coli 大肠杆菌高产姜黄素的膜与共培养工程
IF 9 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-29 DOI: 10.1016/j.biortech.2026.134116
Yiyang Shi, Tong Shi, Jinghua Yu, Xiaolin Shen, Jia Wang, Xinxiao Sun, Qipeng Yuan
Curcuminoids, the major bioactive compounds of Curcuma longa, possess broad pharmacological activities including anticancer, antioxidant, and anti-inflammatory effects, making them valuable for pharmaceutical, nutraceutical, and cosmetic applications. Microbial biosynthesis provides a sustainable alternative. However, the efficiency remains limited due to the poor enzyme expression and the intrinsic hydrophobicity of curcuminoids, which causes intracellular accumulation and metabolic stress. Here, we develop a microbial platform that leverages chaperone-assisted enzyme folding, outer membrane vesicle (OMV)-mediated secretion, and modular co-culture engineering to enhance curcuminoid production in Escherichia coli. Co-expression of molecular chaperones improves the solubility and catalytic performance of plant-derived curcumin synthases, while the OMV system facilitates partial export of hydrophobic products, alleviating cellular burden. By dividing the biosynthetic pathway into upstream ferulic acid and downstream curcumin modules, and implementing carbon-source-based metabolic partitioning, we achieve a relatively stable co-culture, resulting in the production of 978 mg/L in 3 L fed-batch bioreactor, the highest titer reported to date. Our work establishes a versatile framework for microbial synthesis of hydrophobic natural products.
姜黄素是姜黄的主要生物活性化合物,具有广泛的药理活性,包括抗癌、抗氧化和抗炎作用,使其在制药、营养保健和化妆品应用中具有重要价值。微生物生物合成提供了一种可持续的替代方案。然而,由于酶表达差和姜黄素固有的疏水性,导致细胞内积累和代谢应激,效率仍然有限。在这里,我们开发了一个微生物平台,利用伴侣辅助酶折叠、外膜泡(OMV)介导的分泌和模块化共培养工程来提高大肠杆菌中姜黄素的产量。分子伴侣的共表达提高了植物源姜黄素合成酶的溶解度和催化性能,而OMV系统促进了部分疏水产物的出口,减轻了细胞负担。通过将生物合成途径划分为上游阿魏酸和下游姜黄素模块,并实施基于碳源的代谢分配,我们实现了相对稳定的共培养,在3l进料间歇式生物反应器中产生了978 mg/L的滴度,这是迄今为止报道的最高滴度。我们的工作为微生物合成疏水天然产物建立了一个通用的框架。
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引用次数: 0
Hydrodeoxygenation of lignin-derived bio-oil over NiMn/NC catalyst for bio-based liquid fuel 木质素衍生生物油在NiMn/NC催化剂上的氢脱氧生物基液体燃料
IF 11.4 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-29 DOI: 10.1016/j.biortech.2026.134117
Xiaomeng Yang, Jianping Li, Yuandong Xu, Dan Wu, He Liu, Yongsheng Zhang, Chunbao Xu
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引用次数: 0
Strategic enrichment of ammonia-oxidizing archaea biofilms coupled with process optimization for mitigating N2O emissions in wastewater treatment system 氨氧化古细菌生物膜的战略富集与工艺优化对废水处理系统中N2O排放的影响
IF 9 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-29 DOI: 10.1016/j.biortech.2026.134127
Wenzhen Guan , Yifeng Xu , Shengjun Li , Linchuan Fang , Yiwen Liu , Bingjie Ni , Lai Peng
Ammonia-oxidizing archaea (AOA) are pivotal in nitrous oxide (N2O) emissions from wastewater systems, though their N2O production mechanisms remain elusive. In this study, AOA-enriched biofilm consortia (58% Candidatus Nitrosocosmicus) were rapidly formed under antibiotic stress. Systematic investigations were conducted to evaluate the impacts of carrier filling ratios (15%, 30%, 60%) and oxygen levels (0.4%, 4.2%, 10.5%, 21%) on N2O production by AOA in biofilm systems. Batch experiments revealed an inverse correlation between oxygen level and N2O emission and demonstrated that 30% filling ratio exhibited the lowest emission factor compared to 15% and 60%. Optimal performance was achieved under 21% oxygen level combined with a 30% filling ratio, yielding a minimal N2O emission factor (0.01%). Adequate oxygen ensured ammonia oxidation completely, while optimal filling ratio allowed uniform substrate transfer and oxygen diffusion. This study will shed new light on greenhouse gas mitigation in biofilm-based wastewater systems.
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引用次数: 0
Sustained performance and microbial succession in novel artificial rumen system coupling dynamic membrane with methanogenic granules for acid absorption 动态膜与产甲烷颗粒耦合的新型人工瘤胃系统的持续性能和微生物演替
IF 11.4 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-29 DOI: 10.1016/j.biortech.2026.134119
Xiang-Lin Chang, Bao-Shan Xing, Yu Qin, Juan Xie, Zhi-Bo Li, Xiaochang C. Wang, Rong Chen, Yu-You Li
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引用次数: 0
Mechanism study on the effects of Na/K hydroxides and chlorides on NO reduction by biomass volatiles reburning during high-alkali coal combustion 高碱煤燃烧过程中Na/K氢氧化物和氯化物对生物质挥发物再燃还原NO影响的机理研究
IF 11.4 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-28 DOI: 10.1016/j.biortech.2026.134083
Minghui Xu, Jing Zhao, Xiayu Zhu, Honghai Yang, Xiaolin Wei
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引用次数: 0
Multi-pronged design enhances thermostability of zearalenone hydrolase ZenR for enzymatic detoxification of maize flour 多管齐下的设计提高了玉米赤霉烯酮水解酶ZenR的热稳定性
IF 11.4 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-28 DOI: 10.1016/j.biortech.2026.134107
Junqiang Hu, Yuzhuo Wu, Mingliang Zhang, Tingting Han, Qiuyu Zhou, Jinyue Liu, Yunfan Shan, Gang Wang, Xin Liu, Jianrong Shi, Sherif Ramzy Mohamed, Yin-Won Lee, Jianhong Xu, Qing Hong
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引用次数: 0
Novel cylindrical sulfur-based carrier (Kaldnes-S) mediating diverse S0/HS−/Sn2− pathways for enhanced autotrophic denitrification: From lab-scale biofilters to pilot-scale applications 新型圆柱形硫基载体(Kaldnes-S)介导多种S0/HS - /Sn2 -途径以增强自养反硝化:从实验室规模的生物过滤器到中试规模的应用
IF 11.4 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-27 DOI: 10.1016/j.biortech.2026.134106
Kebing Zhou, Zhiyuan Kong, Yan Zhang, Xiangchun Quan, Dongsheng Zhang, Siqi Fang
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引用次数: 0
Enhanced biocathode performance through surface charge induced microbial adhesion 通过表面电荷诱导微生物粘附增强生物阴极性能
IF 9 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-27 DOI: 10.1016/j.biortech.2026.134104
Sofia Antic Gorrazzi, Sebastian Bonanni, Alejandro Javier Robledo, Diego Ariel Massazza
Biocathode performance is often constrained by low biomass accumulation on the electrode surface due to electrostatic repulsion between negatively charged cells and negatively polarized electrodes. A strategy known as polarity reversal is typically applied to overcome this limitation, initially growing bacteria under anodic conditions and subsequently switching the electrode polarity to cathodic. This approach requires substantial time and requires bacteria capable of bidirectional extracellular electron transfer. In this work, biocathode enhancement is achieved by suppressing electrostatic repulsion between bacteria and the electrode during adhesion stage, via the generation of a positive charge on the electrode through polarization above the potential of zero charge (PZC). Bacterial adhesion kinetics to electrodes polarized at different potentials and subsequent current generation were systematically investigated using a real-time, in situ approach. A fivefold increase in the number of irreversibly adhered bacteria during the first 90 min of polarization was observed on positively charged electrodes compared with negatively charged ones. Kinetic analysis revealed a 63% higher attachment rate in the former case. Subsequent biofilm formation was also enhanced, resulting in cathodic current densities higher than those typically reported for pure cultures. The effectiveness of this strategy was confirmed on gold and carbon-based graphite electrodes, indicating that the underlying mechanism is not material-specific. These findings demonstrate that biocathode development can be improved by a strategy termed here as Surface Charge-Induced Microbial Adhesion (SCIMA), providing a mechanistic framework for optimizing its performance in microbial electrochemical technologies.
由于负电荷电池和负极化电极之间的静电斥力,生物阴极的性能往往受到电极表面低生物量积累的限制。一种称为极性反转的策略通常用于克服这一限制,最初在阳极条件下生长细菌,随后将电极极性转换为阴极。这种方法需要大量的时间,并且需要具有双向胞外电子转移能力的细菌。在这项工作中,生物阴极的增强是通过在粘附阶段抑制细菌和电极之间的静电排斥,通过在零电荷电位(PZC)以上的极化在电极上产生正电荷来实现的。采用实时原位方法系统地研究了细菌对不同电位极化电极和随后的电流产生的粘附动力学。在极化的前90 分钟内,在带正电的电极上观察到不可逆粘附细菌的数量比带负电的电极增加了五倍。动力学分析显示,前者的附着率高出63%。随后的生物膜形成也被增强,导致阴极电流密度高于那些通常报道的纯培养。这一策略的有效性在金基和碳基石墨电极上得到了证实,表明潜在的机制不是材料特异性的。这些发现表明,生物阴极的发展可以通过一种被称为表面电荷诱导微生物粘附(SCIMA)的策略来改善,为优化其在微生物电化学技术中的性能提供了一个机制框架。
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引用次数: 0
Site-directed mutagenesis to enhance thermostability of Caulobacter sp. D5 ω-transaminase for efficient bioamination of biobased aldehydes 定点诱变提高Caulobacter sp. D5 ω-转氨酶的热稳定性,以实现生物基醛的高效生物胺化
IF 11.4 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-27 DOI: 10.1016/j.biortech.2026.134103
Junhua Di, Yizhen Zhang, Bright Uwse, Paul Arnaud Yao Koffi, Yu-Cai He, Cuiluan Ma
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引用次数: 0
Artificial regulation of aerobic and anaerobic layers interface enhanced efficient nitrogen removal by weaving insulating grid and conductive carbon fiber in membrane aerated biofilm reactor 人工调节好氧层和厌氧层界面,通过编织绝缘网格和导电碳纤维提高膜曝气生物膜反应器脱氮效率
IF 11.4 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Pub Date : 2026-01-27 DOI: 10.1016/j.biortech.2026.134074
Weichao Li, Jingyu Li, Yun Wu, Meixuan Chen, Yangfan Fu, Wei Li, Shuang Liu, Jie Wang, Yingbo Chen
Artificial regulation of aerobic and anaerobic biofilm thickness is crucial for enhancing nitrogen removal efficiency of the membrane aerated biofilm reactor (MABR). In this study, conductive aeration membrane modules were fabricated by physical weaving technology to couple MABR with microbial electrochemistry for efficient nitrogen removal. Insulating grids of different thickness and conductive carbon fibers were woven onto the aeration membrane to form aerobic and anaerobic layers. When the total biofilm thickness reached 254 μm (150 μm aerobic layer and 104 μm anaerobic layer), the TN removal efficiency (89.49 ± 2.89 %) was optimal. 16S rRNA gene sequencing and metagenomics analysis confirmed that the aerobic and anaerobic layers in the biofilm were completely separated, but there was a synergistic effect in nitrogen removal. The composite cathode structure provides a mechanism for efficient spatial coupling between the aerobic and anaerobic layers, establishing a basis for regulating biofilm stratification.
人工调节好氧和厌氧生物膜厚度是提高膜曝气生物膜反应器(MABR)脱氮效率的关键。本研究采用物理编织技术制备导电曝气膜组件,将MABR与微生物电化学相结合,实现高效脱氮。在曝气膜上编织不同厚度的绝缘网格和导电碳纤维,形成好氧层和厌氧层。当总生物膜厚度为254 μm(好氧层为150 μm,厌氧层为104 μm)时,TN去除率为89.49 ± 2.89 %。16S rRNA基因测序和宏基因组学分析证实,生物膜中的好氧层和厌氧层是完全分离的,但在脱氮方面存在协同作用。复合阴极结构为好氧层和厌氧层之间的有效空间耦合提供了机制,为调节生物膜分层奠定了基础。
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Bioresource Technology
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