JOURNAL OF CATALYSIS
·
2026
·
IF 6
Jie Wang,Feng Gao,Jilei Lin,Chunjuan Zhang,Meiqing Shen,Linghui Kong,Gurong Shen
Ammonia is emerging as a promising carbon-free energy carrier. The electrocatalytic ammonia oxidation reaction (AOR), highly structure-sensitive, exhibits exceptional activity on Pt nanocubes (NCs) with (100) facets. Yet, synthesis methods employing metal carbonyl capping agents inevitably introduce residual metals, whose catalytic effects are often neglected. Here, Pt NCs synthesized with Mo(CO) 6 were found to contain trace Mo both in the bulk and at the surface. Surface Mo species, partially oxidized to MoO x , substantially modify the electronic structure of Pt(100), lowering activation barriers for rate-determining AOR steps and enhancing resistance to nitrogen poisoning. These effects collectively boost AOR performance, enabling a direct ammonia fuel cell with a Pt-154 anode to achieve a peak power density of 26.7 mW cm −2 . These results reveal the overlooked impact of capping-agent-derived contaminants in AOR and point to the deliberate incorporation of heterometallic modifiers as a viable strategy for advanced electrocatalyst design.
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FEBS LETTERS
·
2016
·Vol. 590
·期 16
·2619-2628
·
IF 3.519
Yu-Ying Zhang,Rui-Xue Xu,Shuai Gao,Ai-Xia Cheng
Oroxylin A and hispidulin, compounds which are abundant in both Scutellaria and liverwort species, are important lead compounds for the treatment of ischemic cerebrovascular disease. Their enzymatic synthesis requires an O -methyltransferase able to interact with the related flavonoid's 6-OH group, but such an enzyme has yet to be identified in plants. Here, the gene encoding an O -methyltransferase (designated PaF6OMT) was isolated from the liverwort species Plagiochasma appendiculatum . A test of alternative substrates revealed that its strongest preferences were baicalein and scutellarein, which were converted into, respectively, oroxylin A and hispidulin. Allowed a sufficient reaction time, the conversion rate of these two substrates was, respectively, 90% and 100%. PaF6OMT offers an enzymatic route to the synthesis of oroxylin A and hispidulin.
研究领域:
植物学
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生物化学
·
药理学
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AQUACULTURE
·
2018
·
IF 2.71
Shengli Fu,Mingmei Ding,Yanjian Yang,Jingrong Kong,Yuan Li,Zheng Guo,Anli Wang,Jianmin Ye
Caspases are a family of proteases involved in many important biological processes, including inflammation, cell differentiation and apoptosis. Among them, caspase-6 plays an important role in the execution phase of the apoptotic death cascade. In this study, the full-length of puffer fish caspase - 6 ( Pfcasp - 6 ) was cloned and characterized, containing an open reading frame of 912 bp, a 5′-UTR of 168 bp and a 3′-UTR of 632 bp with a poly (A) tail. The Pfcasp - 6 encoded a polypeptide of 303 amino acids with an estimated molecular mass of 34.09 kDa and a predicted isoelectric point of 5.35. Phylogenetic analysis indicated that Pfcasp-6 was highly homology to that of other teleostean species. Spatial mRNA expression analysis revealed that the ubiquitous expression of Pfcasp - 6 in all examined tissues, with high expression in skin, followed by gill, intestine, kidney , blood, heart and spleen. After the challenges of high temperatures and Aeromonas hydrophila , the transcript expressions of Pfcasp - 6 were significantly up-regulated in blood and spleen. In addition, cellular localization analysis indicated that the distribution of Pfcasp-6 was in the cytoplasm and nucleus. Overexpression of Pfcasp-6 was able to trigger a significant level of cell death in HeLa cells, suggesting its putative role in cell apoptosis. Taken together, the results of this study suggested that Pfcasp - 6 might be an important component in the caspases cascade, and was likely to get involved in the response to different stress in puffer fish.
研究领域:
分子生物学
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免疫学
·
鱼类生理学
·
基因表达
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CHEMICO-BIOLOGICAL INTERACTIONS
·
2022
·
IF 5.168
Wei Li,Yin-Nan Chen,Yue-Yue Chen,Zhe Wang,Zhen Wang,Li-Li Jiang,Hong-Can Shi,Yong Liu
UGT1A1 is the main enzyme that catalyzes the metabolic elimination and detoxification of SN-38, the active form of the drug irinotecan . Milk thistle products have been used widely to protect the liver from injury associated with the use of chemotherapeutic agents. To evaluate whether SN-38 metabolism can be affected by milk thistle products, the inhibitory effects of silybins on UGT1A1*1 and UGT1A1*6 were evaluated in the present investigation. Both silybin A and silybin B potently inhibited SN-38 glucuronidation catalyzed by UGT1A1*1 or UGT1A1*6. It was noteworthy that silybin A and silybin B showed synergistic effect in UGT1A1*1 microsomes at concentration around IC 50 , while additive effect in UGT1A1*6. According to the predicted AUC i /AUC ratios (the ratio of the area under the plasma concentration–time curve of SN-38 in the presence and absence of silybins), the coadministration of irinotecan and several milk thistle products, including silybin-phosphatidylcholine complex, two Legalon capsules , four Silymarin tablets or four Liverman capsules, may lead to clinically significant herb-drug interactions (HDI) via UGT1A1 inhibition. Meanwhile, R gut values were much higher than 11 in all the groups, indicating potential HDI due to intestinal UGT1A1 inhibition.
研究领域:
药理学
·
肿瘤学
·
草药医学
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TISSUE & CELL
·
2020
·
IF 1.837
Haocong Zhang,Meihui Piao,Mingming Guo,Lingzhi Meng,Hailong Yu
The recovery of spinal cord injury (SCI) involves multiple factors, of which miRNAs take an important part. In this study, we evaluated the function of microRNA-211−5p (miR-211−5p) on SCI in a rat model. SCI model was established using modified Allen's weight-drop method and Basso-Bcattie-Bresnahan score was applied to assess the locomotor function. MiR-211−5p agomir was utilized to increase miR-211−5p expression and endoplasmic reticulum (ER) stress inhibitor, 4-PBA (4-phenylbutyric acid), was utilized to suppress ER stress. Neuron apoptosis and the expressions of miR-211−5p, activating transcription factor 6 (ATF6), apoptosis-related proteins, pro-inflammatory cytokines and endoplasmic reticulum stress-related proteins were detected. Dual luciferase reporter gene assay was performed to verify the binding between miR-211−5p and ATF6. The results showed that miR-211−5p directly targeted ATF6. MiR-211−5p was down-regulated and ATF6 was up-regulated in SCI rats. Both interferences with miR-211−5p agomir and 4-PBA effectively attenuated neuron apoptosis and reversed the expressions of apoptosis, inflammation and endoplasmic reticulum stress-related molecules post SCI in rats. These findings demonstrated that miR-211−5p could effectively alleviate SCI-induced neuron apoptosis and inflammation via directly targeting ATF-6 and regulating ER stress.
研究领域:
神经科学
·
分子生物学
·
药理学
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BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Weiwei Meng,Mengjian Gao,Lulu Li,Liming Liu,Xiaomin Li,Wanqing Wei,Jing Wu
Osteoarthritis remains a global health problem and chondroitin sulfate C (CSC) is effective to treat arthritis. The biosynthesis of CSC offers a sustainable and promising alternative to conventional extraction from animal tissues. However, the scarcity of chondroitin-6-O-sulfotransferases and their low catalytic performance have severely hindered the large-scale biosynthesis of CSC. To overcome these limitations, a novel chondroitin-6-O-sulfotransferase from Rattus norvegicus ( Rn CHST3) was identified via gene fishing, which demonstrates regioselectivity in transferring a sulfate group from 3′-phosphoadenosine-5′-phosphosulfate (PAPS) to the 6-position of chondroitin. Subsequent optimization of expression conditions and truncation of the N -terminal region enhanced the sulfation rate from 4.6% to 11.5%. For the first time, the regioselective mechanism of Rn CHST3 was elucidated through molecular dynamics (MD) simulations and site-directed mutagenesis. A mechanism-guided rational design led to the development of mutant M5, which increased the sulfation rate to 46.2%. Furthermore, a novel “physical sieve”-guided PROSS design was developed to improve kinetic thermostability, resulting in mutant M7. This variant exhibited an extended half-life from 9.4 h to 12.3 h and achieved a sulfation rate to 74.5%. Finally, a whole-cell catalytic system was constructed for CSC production, reaching a sulfation rate of 86.4% and a titer of 12.9 g·L −1 -the highest level reported to date. This study lays a solid foundation for the industrial biosynthesis of CSC.
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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2015
·
IF 3.447
Le-Mao Yu,Xiao-Ru Zhang,Xiao-Bing Li,Yuan Yang,Hong-Yu Wei,Xi-Xin He,Lian-Quan Gu,Zhi-Shu Huang,Yves Pommier,Lin-Kun An
In our previous work, indolizinoquinolinedione derivative 1 was identified as a Top1 catalytic inhibitor. Herein, a series of 6-substituted indolizinoquinolinedione derivatives were synthesized through modification of the parent compound 1 . Top1 cleavage and relaxation assays indicate that none of these novel compounds act as classical Top1 poison, and that the compounds with alkylamino terminus at C-6 side chain, including 8 , 11 – 16 , 18 – 21 , 25 , 26 and 28 – 30 , are the most potent Top1 catalytic inhibitors. Top1-mediated unwinding assay demonstrated that 14 , 22 and 26 were Top1 catalytic inhibitors without Top1-mediated unwinding effect. Moreover, MTT results showed that compounds 26 , 28 – 30 exhibit significant cytotoxicity against human leukemia HL-60 cells, and that compound 26 exerts potent cytotoxicity against A549 lung cancer cells at nanomolar range.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 12
·7503-7513
·
IF 3.9
Mengmeng Zhu,Yunpeng Liu,Haojie Ding,Shulan Zhang,Mujing Qu,Tongtong Xuan,Huili Li
All-inorganic CsPbX 3 (X = Cl, Br, and I) perovskite nanocrystals (NCs) have great application prospects in many fields due to their excellent photoelectric properties. However, CsPbX 3 NCs are extremely sensitive to water, heat, light, and oxygen, which leads to dramatic photoluminescence quenching and seriously restricts their future commercial applications. Herein, a novel, simple one-step solution strategy for synthesizing high-quality CsPbBr 3 NCs was reported. By the combination of the hot-injection process with the mesoporous template confinement effect of the KIT-6 matrix, the space-confined growth of NCs was precisely achieved. The CsPbBr 3 NCs encapsulated by KIT-6 (CsPbBr 3 @KIT-6 composite) exhibited a uniform size, a high photoluminescence quantum yield (PLQY) of up to 82%, and a narrow full width at half-maximum (FWHM) of 24 nm. Most importantly, CsPbBr 3 @KIT-6 powder composites had dramatically enhanced light, thermal and water stability in comparison with colloidal CsPbBr 3 NCs due to the dual protection of organic ligands and matrix templates. Ultimately, a white light-emitting diode (LED) device was successfully fabricated by encapsulating a mixture of green-emitting CsPbBr 3 @KIT-6 composite and red-emitting K 2 SiF 6 :Mn 4+ phosphor onto a blue-emitting InGaN LED chip. A color coordinate of (0.327, 0.337) and a wide color gamut of 128% NTSC well demonstrate their potential applications in lighting and display.
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ChemistrySelect
·
2023
·Vol. 8
·期 26
·e202204971
·
IF 2.1
Taiwen Zhang,Jun Guo,Yiju Zhang,Dan Zhang,Lin Lu,Shuangyan Qiu,Jiangqin Zhong
Graphical The two modified rare heterogeneous Keggin-type crystalline heteropolyacid Calix[6]arene-like catalysts were synthesized by one-pot method with PMo 12 or PW 12 , and these were characterized using single-crystal X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), X-ray diffraction (XRD), and elemental analysis, finally, the catalytic performance and reaction kinetics for the two compounds’ effects were compared during the oxidation process. Two modified Calix[6]arene-like polyoxometalates of the Keggin type with similar structures were synthesized under hydrothermal conditions by H 3 PMo 12 O 40 . H 3 PW 12 O 40 , 4H-1,2,4-triazol-3-amine (3-atrz) and copper ions were used as precursors, respectively, bridging organic ligand and transition metals. The result of single-crystal X-ray diffraction and elemental analysis showed that the structural formulas of the two crystalline compounds were: [2(C 6 H 12 N 12 Cu 3 PW 12 O 40 )] (3-atrz-Cu-PW 12 ), and [2(C 6 H 12 N 12 Cu 3 PMo 12 O 40 )] ⋅ 0.5H 2 O (3-atrz-Cu-PMo 12 ). They were composed of two classic Keggin-type polyoxometalate anions and six [Cu(C 2 H 4 N 4 )] + coordination polymers similar to Calix[6]arene. The catalytic studies represented that the two heterogeneous catalysts catalyzed the oxidation of iodide ions in hydrogen peroxide. The catalytic reaction of 3-atrz-Cu-PW 12 only took 30 min and 15 s to complete the reaction. The rate of iodine generation was 6.86×10 −7 mol L −1 s −1 . The 3-atrz-Cu-PMo 12 catalytic reaction needed only 1 min and 51 s, in which the rate of iodine generation was 1.126×10 −5 mol L −1 s −1 . The catalytic reaction rate of 3-atrz-Cu-PMo 12 was 16.35 times higher than 3-atrz-Cu-PW 12 . Both catalysts were reused nine times, and the conversion rate was still 99.96 %, showing excellent catalytic activity and repeatability.
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Nanoscale
·
2023
·
IF 6.7
Xia Zhang,Like Ning,Hongshuai Wu,Wenhong Wang,Suisui Yang,Ziyi Hu,Yuandong Cao,Hongliang Xin,Chaoqun You,Fan Lin
Despite aggressive treatments, including surgery, chemo- and radio-therapy, the prognosis of glioblastoma (GBM) remains poor and tumor recurrence is inevitable. The FDA-approved CDK4/6 inhibitor palbociclib (PB) showed interesting anti-GBM effects, but its brain penetration is limited by the blood-brain barrier. The hypothesis of this project is to find whether the cellulose-based hydrogel via in situ injection could provide an alternative route of PB brain delivery and generate sufficient drug exposure in orthotopic GBM. In brief, PB was encapsulated in a cellulose nanocrystal network structure crosslinked by polydopamine via divalent Cu2+ and hexadecylamine. The formed hydrogel (PB@PH/Cu-CNCs) exhibited sustained drug retention and acid-responsive network de-polymerization for controlled release in vivo. Specifically, the released Cu2+ catalyzed a Fenton-like reaction to generate reactive oxygen species (ROS), which was further enhanced by PB, and consequently induced irreversible senescence and apoptosis in GBM cells. Finally, PB@PH/Cu-CNCs demonstrated a more potent anti-GBM effect than those treated with free PB or PH/Cu-CNCs (drug-free hydrogel) in cultured cells or in an orthotopic glioma model. These results prove that the injection of PB-loaded hydrogel in situ is an effective strategy to deliver CDK4/6 inhibitor into the brain and its anti-GBM effect can be further enhanced by combining Cu2+-mediated Fenton-like reaction.
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POLYMER
·
2023
·
IF 4.6
Lan Guo,Yunsheng Xu,Xianming Zhang,Guo-Hua Hu
Nanoparticles are used to compatibilize immiscible polymer blends . The key to success is to localize nanoparticles at polymer-polymer interfaces. This work aims to use silica nanoparticles (SiO 2 ) to compatibilize polyamide 6 (PA6)/polycarbonate (PC) blends. The strategy to ensure the interfacial localization of the SiO 2 in the blends is to graft a methacrylic monomer onto the SiO 2 and then copolymerize this methacrylic monomer with styrene (St) and 3-isopropenyl-α,α′-dimethylbenzyl isocyanate (TMI). When PA6 and PC are blended in the melt in the presence of the above surface modified SiO 2 (denoted as SiO 2 -PST), PA6 chains are grafted onto the SiO 2 -PST to form PA6-SiO 2 -PST through a coupling reaction between the terminal amine group of the PA6 and the isocyanate moieties of the PST grafts which are partially miscible with the PC. It is shown that an optimum TMI content allows for the SiO 2 -PST to be preferentially localized at the interfaces between the PA6 and PC. This leads to a significant decrease in the PC domain diameter from 1.6 μm to 0.6 μm without and with the SiO 2 -PST, respectively. The presence of the SiO 2 -PST (0.5 wt% with an optimum TMI content) increases the tensile strength of the PA6/PC (70/30 by weight) from 64.1 to 79.6 MPa, the elongation at break from 84.7 to 284.7%, and the notched Charpy impact strength from 10.3 to 29.4 kJ/m 2 .
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APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2023
·Vol. 89
·期 3
·
IF 4.4
Lei Miao,Shanshan Sun,Tian Ma,Yousif Abdelrahman Yousif Abdellah,Yue Wang,Yaozu Mi,Haohao Yan,Guanjun Sun,Ning Hou,Xinyue Zhao,Chunyan Li,Hailian Zang
Global-scale estrone (E1) contamination of soil and aquatic environments results from the widespread use of animal manure as fertilizer, threatening both human health and environmental security. A detailed understanding of the degradation of E1 by microorganisms and the associated catabolic mechanism remains a key challenge for the bioremediation of E1-contaminated soil. Here, Microbacterium oxydans ML-6, isolated from estrogen-contaminated soil, was shown to efficiently degrade E1. A complete catabolic pathway for E1 was proposed via liquid chromatography-tandem mass spectrometry (LC-MS/MS), genome sequencing, transcriptomic analysis, and quantitative reverse transcription-PCR (qRT-PCR). In particular, a novel gene cluster (moc) associated with E1 catabolism was predicted. The combination of heterologous expression, gene knockout, and complementation experiments demonstrated that the 3-hydroxybenzoate 4-monooxygenase (MocA; a single-component flavoprotein monooxygenase) encoded by the mocA gene was responsible for the initial hydroxylation of E1. Furthermore, to demonstrate the detoxification of E1 by strain ML-6, phytotoxicity tests were performed. Overall, our findings provide new insight into the molecular mechanism underlying the diversity of E1 catabolism in microorganisms and suggest that M. oxydans ML-6 and its enzymes have potential applications in E1 bioremediation to reduce or eliminate E1-related environmental pollution.IMPORTANCE Steroidal estrogens (SEs) are mainly produced by animals, while bacteria are major consumers of SEs in the biosphere. However, the understanding of the gene clusters that participate in E1 degradation is still limited, and the enzymes involved in the biodegradation of E1 have not been well characterized. The present study reports that M. oxydans ML-6 has effective SE degradation capacity, which facilitates the development of strain ML-6 as a broad-spectrum biocatalyst for the production of certain desired compounds. A novel gene cluster (moc) associated with E1 catabolism was predicted. The 3-hydroxybenzoate 4-monooxygenase (MocA; a single-component flavoprotein monooxygenase) identified in the moc cluster was found to be necessary and specific for the initial hydroxylation of E1 to generate 4-OHE1, providing new insight into the biological role of flavoprotein monooxygenase.
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