Frontiers in Microbiology
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2021
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IF 5.64
Huang Maoxi,Yan Yunlong,Wang Li,Chen Jun,Liu Tao,Xie Xin,Li Xiangyang
Amino-phosphonate derivative R-diphenyl-1-(4-methylbenzothiazole-2-amino)-1-(thiphene-2-yl)-methylphosphonate (Q-R) has a high protective anti-tobacco mosaic virus (TMV) activity. However, the mechanism responsible for Q-R’s effect on TMV infection is largely unknown. Here, we studied the expression levels of harpin-binding protein 1 (HrBP1) and pathogenesis-related protein-1a (PR-1a) in TMV-infected tobacco plants by using reverse transcription quantitative real-time PCR. Then, we verified the interactions between Q-R and the HrBP1 protein from Escherichia coli using isothermal titration calorimetry and studied the Q-R-associated assembly of HrBP1 using size-exclusion chromatography. The results showed that the expression levels of HrBP1 and PR-1a genes were significantly increased by Q-R at the transcriptional level in TMV-infected tobacco plants, and the E. coli-expressed HrBP1 protein was assembled into oligomers by Q-R via binding to HrBP1 with a dissociation constant of 1.19 μM. We, therefore, concluded that Q-R activated the HrBP1 and PR-1a genes and enhanced the ability of HrBP1 to assemble in tobacco plants.
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
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IF 2.291
Peixi Hao,Linwen Jiang,Hanlei Zhao,Jiangtao Li,Shiwen Qiu,Hongbing Chen
The MFeO 3 : R 3+ (M = La, Gd; R = Eu, Er, Ho) nanocrystalline powders were successfully synthesized by the sol–gel combustion method using glycine-based gel at a low ignition temperature. The as-burnt products present honeycomb-like structure with many irregular continuous pores due to the releasing of a large amount of gas during the combustion reaction process. The lattice parameters and cell volumes of MFeO 3 :R 3+ (M = La, Gd; R = Eu, Er, Ho) nanocrystalline powders are compared in detail. The magnetic properties of all the samples were studied systematically. The results show that the doping of rare-earth ions enhanced greatly the coercivity of GdFeO 3 and LaFeO 3 as a result of the enhancement of magnetic anisotropy . The influence of doped rare-earth ions on the magnetic properties was summarized. The distinction of magnetism of MFeO 3 :R 3+ (M = La, Gd; R = Eu, Er, Ho) were explained in detail by the intrinsic magnetism of doped rare-earth ions. This work is significant for the application of rare-earth elements in other magnetic materials.
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NEW JOURNAL OF CHEMISTRY
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2015
·Vol. 40
·期 2
·1878-1881
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IF 3.086
Yong Cui,Zhe Zhang,Xu Du,Wei Liu,Yulin Deng,Shi Liu,Gang Wang
CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin films were obtained via a solution process based on homogeneous precursor solutions and selenization. The as-prepared thin films were characterized by XRD, EDS and SEM. The CdS buffer layer was deposited by a solution process on the CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin films, and Mo/CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co)/CdS/i-ZnO/ITO/Al thin-film solar cells were fabricated. The efficiencies of the as-fabricated CuIn0.9R0.1(S,Se)2 (R = Al, Ni, Co) thin-film solar cells were 4.33%, 2.38% and 1.98%, respectively.
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ACS Omega
·
2024
·
IF 3.7
Jinfu Wang,Yan Guo,Huifen Zhou,Yanjie Hua,Haitong Wan,Jiehong Yang
Objective: Cardiac ischemia-reperfusion (I/R) injury has negative effects on the brain and can even lead to the occurrence of ischemic stroke. Clinical evidence shows that Danhong injection (DHI) protects the heart and brain following ischemic events. This study investigated the mechanisms and key active compounds underlying the therapeutic effect of DHI against brain damage induced by cardiac I/R injury. Methods: The gene expression omnibus database provided GSE66360 and GSE22255 data sets. The R programming language was used to identify the common differentially expressed genes (cDEGs). Gene ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analysis were performed, and protein–protein interaction network was constructed. Active compounds of DHI were collected from the Traditional Chinese Medicine Systems Pharmacology database. Molecular docking and molecular dynamics simulations were performed. The MMPBSA method was used to calculate the binding-free energy. The pkCSM server and DruLiTo software were used for Absorption, Distribution, metabolism, excretion, and toxicity (ADMET) analysis and drug-likeness analysis. Finally, in vitro experiments were conducted to validate the results. Results: A total of 27 cDEGs had been identified. The PPI and enrichment results indicated that TNF-α was considered to be the core target. A total of 80 active compounds were retrieved. The molecular docking results indicated that tanshinone I (TSI), tanshinone IIA (TSIIA), and hydroxyl safflower yellow A (HSYA) were selected as core active compounds. Molecular dynamics verification revealed that the conformations were relatively stable without significant fluctuations. MMPBSA analysis revealed that the binding energies of TSI, TSIIA, and HSYA with TNF-α were −36.01, −21.71, and −14.80 kcal/mol, respectively. LEU57 residue of TNF-α has the highest contribution. TSI and TSIIA passed both the ADMET analysis and drug-likeness screening, whereas HSYA did not. Experimental verification confirmed that DHI and TSIIA reduced the expression of TNF-α, NLRP3, and IL-1β in the injured H9C2 and rat brain microvascular endothelial cells. Conclusion: TNF-α can be considered to be a key target for BD-CI/R. TSIIA in DHI exerts a significant inhibitory effect on the inflammatory damage of BD-CI/R, providing new insights for future drug development.
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JOURNAL OF BIOTECHNOLOGY
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2025
·
IF 3.9
Yuwen Wei,Fulong Li,Yukun Zheng,Youxiang Liang,Yan Du,Huimin Yu
Transaminases have important applications in the synthesis of drug intermediates such as chiral amines. However, natural transaminases exhibit suboptimal thermal stability, limiting their further applications. Building upon an Rhodobacter sp. -derived ( R )-selective transaminase ( Rb TA), we report a dual-region coupling engineering approach to improve thermostability of Rb TA by strengthening the core hydrogen-bond networks and rigidifying the flexible surface loop. Through single strategy, we identified 4 thermostability improved single mutations, among which I249Q demonstrated the most substantial improvement, achieving a 18-fold increase in half-life ( t 1 / 2 40 ) and a 11.2 ℃ increase in T 50 10 . Then in strategic coupling, the synergistic effect of dual-region modification was observed in both thermal stability and activity enhancement, as mutant with the best high-temperature catalytic performance, R136P/F228Y, had its T 50 10 improved by 7.1℃ and exhibited a 4.2-fold increase in k cat / K m towards ( R )-3-amino-1-butanol. Finally, R136P/F228Y achieved a 20.5 % improvement in conversion over WT in an analytical-scale synthesis in 72 h at a 5 ℃ elevated catalytic temperature. Molecular dynamics simulations demonstrated that the synergy of the formation of new hydrogen bonds and decrease in flexibility accounted for the thermostability improvements. This study provides guidance for enhancing thermostability of similar fold-type enzymes without impairing enzymatic activity in an efficient manner.
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ACS Omega
·
2020
·
IF 2.87
Xinming Feng,Jing Guo,Rubing Zhang,Wei Liu,Yujin Cao,Mo Xian,Huizhou Liu
An aminotransferase ω-TAEn was identified from Enhydrobacter aerosaccus. The ω-TAEn was successfully expressed in Escherichia coli and the obtained enzyme showed activity toward β-phenylalanine (β-phe) at optimal conditions. For optically pure (R)-β-phe, 50% yield was observed by kinetic resolution of racemic amino with pyruvate as the amino acceptor. To obtain (S)-β-phe, the lipase/ω-TAEn catalytic system was adopted. The ω-TAEn showed strict stereoselectivity to the amino donor. The formation of (S)-β-phe was observed using 3-aminobutyric acid as the amino donor, and (S)-β-phe was obtained by asymmetric synthesis with a yield of 82%.
研究领域:
生物化学
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生物催化
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酶学
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化学生物学
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ENERGY
·
2025
·
IF 9.4
Hong-Yu Ren,Qingqing Song,Bing-Feng Liu,Xueting Song,Shan Gao,Nan-Qi Ren,Fanying Kong
Dye wastewater is a type of wastewater that is difficult to treat, and the degradation of dye using microalgae is both effective and profitable. This study cultivated microalgae Asterarcys quadricellulare R-56 under anaerobic condition for the removal of Congo red dye and explored the growth and lipid accumulation of microalgae with only Congo red dye as the carbon source, and a pathway for the degradation of Congo red by microalgae was proposed. The removal efficiency of Congo red (60 mg/L) by microalgae under light anaerobic culture mode reached 91.6 %, which was higher than that of light aerobic condition (60.8 %). The highest microalgae biomass was 406.4 ± 18.3 mg/L with a concentration of Congo red of 100 mg/L, which was 1.6 times of the control group. Moreover, the highest lipid production and lipid content were 187 ± 3.2 mg/L and 61.1 ± 3.1 %, respectively. In addition, the total saturated and monounsaturated fatty acid content of microalgae lipids reached 96.7 % at 100 mg/L Congo red, which was higher than that of the control group (85.5 %), more favorable for the production of high-quality biodiesel. The mechanism of removing Congo red by microalgae was mainly the biosorption and biodegradation. This study shows that the use of microalgae for dye purification and resource recovery is a promising strategy.
研究领域:
环境生物技术
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藻类学
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生物能源
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污染控制
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废水处理
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Advanced Science
·
2024
·
IF 14.3
Ping-Fen Yang,Tai-Lei Nie,Xia-Nan Sun,Lan-Xin Xu,Cong Ma,Fang Wang,Li-Hong Long,Jian-Guo Chen
Physical exercise has beneficial effect on anxiety disorders, but the underlying molecular mechanism remains largely unknown. Here, it is demonstrated that physical exercise can downregulate the S-nitrosylation of gephyrin (SNO-gephyrin) in the basolateral amygdala (BLA) to exert anxiolytic effects. It is found that the level of SNO-gephyrin is significantly increased in the BLA of high-anxiety rats and a downregulation of SNO-gephyrin at cysteines 212 and 284 produced anxiolytic effect. Mechanistically, inhibition of SNO-gephyrin by either Cys212 or Cys284 mutations increased the surface expression of GABA A R γ2 and the subsequent GABAergic neurotransmission, exerting anxiolytic effect in male rats. On the other side, overexpression of neuronal nitric oxide synthase in the BLA abolished the anxiolytic-like effects of physical exercise. This study reveals a key role of downregulating SNO-gephyrin in the anxiolytic effects of physical exercise, providing a new explanation for protein post-translational modifications in the brain after exercise.
研究领域:
神经科学
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分子生物学
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行为科学
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Evidence-based Complementary and Alternative Medicine
·
2020
·
IF 1.813
Yongpan Huang,Xian Long,Xinliang Li,Saihua Li,Jianbin He
Background. Oxymatrine (OMT) is the primary pharmacological component of Sophora flavescens Aiton., which has been shown to possess potent antifibrotic, antioxidant, and anti-inflammatory activities. The aim of the present study was to clarify the protective mechanism of OMT on acute lung injury (ALI) subjected to myocardial ischemia/reperfusion (I/R). Methods. A myocardial I/R-induced ALI model was achieved in diabetic rats by occluding the left anterior descending coronary artery for 1 h, followed by reperfusion for 1 h. The levels of inflammatory factors (tumor necrosis factor-α, interleukin- (IL-) 6, and IL-17) in bronchoalveolar lavage fluid were assessed using commercially available kits. The index of myocardial injury, including the detection of cardiac troponin I (cTnI), cardiac troponin T (cTnT), lactate dehydrogenase (LDH), and creatine kinase-MB (CK-MB), was also determined using commercially available kits. Hematoxylin and eosin staining and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling were used to identify histological changes. The expression levels of endoplasmic reticulum chaperone BiP (GRP78), DNA damage-inducible transcript 3 protein (CHOP), eukaryotic translation initiation factor 2-alpha kinase 3 (PERK), inositol dependent enzyme 1α (IRE1α), ATF6, caspase-3, -9, and-12, Bcl-2, and Bax were determined by Western blotting. The mRNA expression levels of GRP78 and CHOP were detected by reverse transcription-quantitative PCR. Results. Myocardial I/R increased the levels of cTnI, cTnT, LDH, and CK-MB in diabetic rats. Damaged and irregularly arranged myocardial cells were also observed, as well as more serious ALI with higher lung injury scores and WET/DRY ratios and lower PaO2. Moreover, the expression of key proteins of endoplasmic reticulum stress (ERS) was increased by I/R injury, including phosphorylated- (p-) PERK, p-IRE1ɑ, and ATF6, as well as decreased levels of apoptosis. These effects were all significantly reversed by OMT treatment. Conclusions. OMT protects against ALI subjected to myocardial I/R by inhibiting ERS in diabetic rats.
研究领域:
药理学
·
病理学
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Food Bioscience
·
2026
·
IF 6.2
Xi Hu,Ruxuan Tan,Xueling Qin,Qingyun He,Zhihua Huang,Lizhong Nong,Junwei Qin,Zhenqiang Wu
Hyperuricemia is associated with dietary purine intake, dysregulated purine metabolism, and impaired uric acid excretion. This study aimed to isolate multifunctional LAB from fermented foods and apply the selected strain to enhance the functional potential of Smilax glabra Roxb. fermentation. Among 79 isolates, 46 were identified as LAB. Limosilactobacillus fermentum R-9 showed efficient degradation of inosine, guanosine, and adenosine, while exhibiting favorable gastrointestinal tolerance and safety-related probiotic properties. Its survival rates after simulated gastric and intestinal digestion were 82.28% and 67.18%, respectively. Genomics revealed genes related to nucleoside hydrolysis, purine/pyrimidine transport, nucleotide salvage, starch utilization, α-glucan metabolism, and β-glucosidase-related glycoside transformation, supporting the dual potential of R-9 for purine metabolism and adaptation to starch-rich S. glabra . L. fermentum R-9 was further used to ferment Smilax glabra Roxb., a starch-rich medicinal and edible plant material containing flavonoid glycosides. After 4 days of fermentation, total phenolics increased from 0.384 to 0.572 mg GAE/mL, and total flavonoids increased from 2.11 to 3.02 mg RE/mL. Xanthine oxidase (XOD) inhibitory activity increased from 16.58% to 70.81%, accompanied by enhanced DPPH and ABTS radical-scavenging activities. Astilbin reached 59.75 μg/mL, increasing by 33.79%. Mechanistically, L. fermentum R-9 fermentation promoted acidification, amylase and β-glucosidase activities, starch matrix disruption, and flavonoid release. These findings highlight L. fermentum R-9 as a promising starter for developing fermented Smilax glabra Roxb. products with enhanced antioxidant and xanthine oxidase inhibitory potential.
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ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Ruizhi Tang,Shujuan Ma,Quan Bai,Yangyang Bian,Zichao Tang,Junjie Ou
Host–guest interactions by artificially synthesized macrocyclic molecules, such as cucurbit[n]uril (CB[n], n refers to the number of glycoluril units), exhibited comparable affinity to natural biological interactions, offering orthogonal selectivities. These unique high-affinity interactions are crucial in bioseparation, particularly in the separation of complex biomacromolecules. However, to date, the application of supramolecular systems in bioseparation remains insufficient and challenging. In this work, a site-specific host–guest interaction-based method by CB[6] and CB[7] was developed for the selective enrichment of basic peptides, and their recognition for basic lysine/arginine (K/R) residues exhibited distinct selectivity. Although they both exhibited affinity to basic peptides, CB[6] tended to bind to peptides containing multiple K/R residues, while CB[7] preferred to adsorb peptides containing both phenylalanine residues and basic K/R residues. This difference was attributed to their distinct cavity sizes. Furthermore, CB[6]-containing monolith was employed for the enrichment of basic peptides from mouse liver sample digested with Staphylococcus aureus protease V8 (Glu-C). It is noteworthy that basic peptides containing 3–4 K/R residues can be successfully enriched, whereas those with more than 5 K/R residues cannot be effectively eluted. It was also observed that 1043 unique peptides were newly identified from 2.5 μg of mouse liver after the capture of basic peptides, with a markable increase in the identification coverage (31%). These newly identified peptides are generally more acidic and shorter than those depleted by CB[6], with median isoelectric point (pI) values of 5.8 and 7.0 and median lengths of 10 and 16 amino acids, respectively.
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INTERNATIONAL IMMUNOPHARMACOLOGY
·
2018
·
IF 3.118
Yan-dan Zhou,Jin-gang Hou,Wei Liu,Shen Ren,Ying-ping Wang,Rui Zhang,Chen Chen,Zi Wang,Wei Li
Although ginsenoside Rg3 was isolated as a major component of Korea red ginseng and confirmed to exert potential hepatoprotective effect on acetaminophen (APAP)-induced liver injury via induction of glutathione S-transferase (GST) in vitro, the in vivo hepatoprotective effect of Rg3 and the underlying molecular mechanism of action remain unclear. The current study was aimed to explore whether 20( R )-Ginsenoside Rg3 (20( R )-Rg3) could alleviate acetaminophen-induced liver injury in mice and to determine the involvement of PI3K/AKT signaling pathway . Our findings demonstrated that a single injection of APAP (250 mg/kg) increased the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), tumor necrosis factor-α (TNF-α), and interleukin-1β (IL-1β); such increases were attenuated by pretreatment of mice with 20( R )-Rg3 for seven days. The depletion of glutathione (GSH), generation of malondialdehyde (MDA) and the over expression of cytochrome P450 E1 (CYP2E1) and 4-hydroxynonenal (4-HNE) caused by APAP exposure were also inhibited by 20( R )-Rg3 pretreatment. Moreover, 20( R )-Rg3 pretreatment significantly alleviated APAP-induced apoptosis , necrosis, and inflammatory infiltration in liver tissues. Importantly, 20( R )-Rg3 effectively attenuated APAP-induced liver injury in part via activating PI3K/AKT signaling pathway. In summary, 20( R )-Rg3 exerted liver protection against APAP-caused hepatotoxicity evidenced by inhibition of oxidative stress and inflammatory response, alleviation of hepatocellular necrosis and apoptosis via activation of PI3K/AKT signaling pathway, showing potential as a novel therapeutic agent to prevent liver damage.
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