AMB Express
·
2019
·Vol. 9
·期 1
·1-11
·
IF 2.226
Guo Zongren,Long Liangkun,Ding Shaojun
d -Mannose and l -ribose are two important monosaccharides, which have attracted public attention recently because of their great application potentials in food, cosmetic and pharmaceutical industries. Sugar isomerases catalyze the sugar isomerization and therefore can be used as the biocatalysts for production of the high-value sugars from inexpensive sugars. l -arabinose isomerase catalyzes the conversion of l -arabinose to l -ribulose, while d -lyxose isomerase catalyzes l -ribulose and d -fructose to l -ribose and d -mannose, respectively. In this paper, a putative d -LI from Bacillus velezensis (BvLI) was identified, characterized and used to produce d -mannose and l -ribose from d -fructose and l -arabinose, respectively. The recombinant BvLI exhibited a maximum activity at 55 °C and pH 6.5, in the presence of 0.1 mM Co 2+ . Approximately 110.75 g/L d -mannose was obtained from 500 g/L d -fructose in 6 h by the recombinant BvLI, and approximately 105 g/L l -ribose was obtained from 500 g/L l -arabinose in 8 h by the successive biocatalysis of l -arabinose isomerase from Bacillus licheniformis (BlAI) and BvLI.
研究领域:
生物化学
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生物技术
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食品科学
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制药学
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产品关联
DOI
PubMed
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2022
·
IF 3.858
Jianjiong Li,Shanshan Yu,Yingang Wang,Peiyuan Yao,Qiaqing Wu,Dunming Zhu
(S)-2-Aminobutane, d-alanine, and d-homoalanine are important intermediates for the production of various active pharmaceutical ingredients and food additives. The preparation of these small chiral amine or amino acids with high water solubility still demands searching for efficient methods. In this work, we identified an ω-transaminase (ω-TA) from Sinirhodobacter hungdaonensis (ShdTA) that catalyzed the kinetic resolution of racemic 2-aminobutane at a concentration of 800 mM using pyruvate as the amino acceptor, leading to the simultaneous isolation of enantiopure (S)-2-aminobutane and d-alanine in 46% and 90% yield, respectively. In addition, (S)-2-aminobutane (98% ee) and d-homoalanine (99% ee) were isolated in 45% and 93% yield, respectively, in the kinetic resolution of racemic 2-aminobutane at a concentration of 400 mM coupled with deamination of l-threonine by threonine deaminase. We thus developed a biocatalytic process for the practical synthesis of these valuable small chiral amine and d-amino acids.
研究领域:
生物催化
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有机化学
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药物化学
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DOI
高影响因子
JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
·
2017
·
IF 0.697
Yanni Miao,Qi Liu,Wei Wang,Li Liu,Li Wang
A new chiral capillary electrophoresis (CE) analytical method for the determination of six pairs of amino acid enantiomer-derivatized precapillary with 9-fluorenylmethoxycarbonyl chloride (FMOC) was developed. CE separation parameters such as the pH of background electrolyte, the boric acid concentration, the addition of D-fructose and isopropanol, and the effect of new binary chiral selectors on the electropherograms were investigated. Precapillary and in-capillary derivatization was compared as well. The results showed that enantiomeric separations were obtained with enantio-resolution (Rs) ranged from 2.61 to 9.99 for the FMOC-derivatized amino acid enantiomers except alanine with Rs 1.06. Precapillary derivatization method provides overall better Rs for nearly all the targets except FMOC-aspartate with efficiency up to 1.309 × 106 plates and limit of detection (LOD) down to 2.5 μM. This method was successfully applied to analyze the concentration of the D/L-glutamic acid and D/L-aspartate in seven rice wine samples.
研究领域:
分析化学
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食品科学
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产品关联
DOI
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 103
·期 2
·793-806
·
IF 3.34
Yang Haiquan,Hu Jinyuan,Lu Xiao,Wang Fuxiang,Shen Wei,Hu Wei,Wang Lingling,Chen Xianzhong,Liu Long
Most recombinant proteins in Escherichia coli are not efficiently secreted to the extracellular space. Structural stabilisation of the cell wall is essential for extracellular protein production in E. coli , for which D,D-carboxypeptidases are essential. Herein, we perturbed the peptidoglycan structure of the E. coli cell wall by overexpressing D,D-carboxypeptidase genes dacA or dacB , and investigated the effect on extracellular protein production. Overexpression of dacA or dacB promoted the accumulation of intracellular soluble peptidoglycan, altered cell morphology (shape and size) and led to the formation of transparent globular structures in E. coli cells. Compared with controls (CK), extracellular production of recombinant green fluorescent protein (GFP) was increased by 1.7- and 2.3-fold upon overexpression of dacA and dacB , respectively. Similarly, extracellular production of recombinant amylase and α-galactosidase was increased by 4.5- and 2.8-fold, respectively, upon overexpression of dacA , and by 11.9- and 2.5-fold, respectively, upon overexpression of dacB . Overexpression of dacA or dacB enhanced both the outer and inner membrane permeability of E. coli . This cell wall engineering strategy opens up a new direction for enhancing extracellular protein and chemical production in E. coli .
研究领域:
微生物学
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生物技术
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分子生物学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Chang Liu,Yanan Wu,Mengying Li,Fang Liu,Pengfei Kong,Haifeng Yang,Xinling Liu
Salivary d-alanine (d-Ala) and d-proline (d-Pro) are of concern for their potential in the noninvasive diagnosis of gastric cancer (GC). Most reports have succeeded in determining the total concentration of d-Ala and d-Pro. However, for personalized diagnosis and better elucidation of the underlying specific correlation of d-Ala (or d-Pro) with GC, it is desirable to determine the specific concentration of d-Ala or d-Pro. Herein, we propose an enantiomer-specific tandem assay of d-Ala based on the colorimetric reaction between 2,4-dinitrophenylhydrazine and pyruvic acid generated from the deamination of d-Ala catalyzed by d-amino acid oxidase, which is easily distinguished from l-form amino acids, d-Pro, and many other species. A linear concentration range is established from 20 to 400 μmol/L with a limit of detection of 1.01 μmol/L. Real saliva sample tests reveal that the levels of d-Ala in GC cases are remarkably higher than those in healthy individuals, which offers a simple and low-cost strategy for GC diagnosis. Simultaneously, the total concentrations of d-Ala and d-Pro in saliva are determined. Hence, the concentration of d-Pro and the proportion of d-Ala could be calculated, which further provides more molecule- and individual-specific information. This research may offer a convenient method for noninvasive diagnosis of GC and pave a new route to explore the potentials of rare d-form amino acids in disease diagnosis and treatment.
研究领域:
生物化学
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医学诊断
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癌症研究
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DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-9
·
IF 15.7
Zhang Xiu-Feng,Zhang Shi-Nan,Zhang Zhao,Leng Bing-Liang,Lu Kai-Yuan,Chen Jie-Sheng,Li Xin-Hao
Deuterated organic compounds have gained significant attention due to their diverse applications, including reaction mechanism studies, probes for metabolism and pharmacokinetics, and raw materials for labeled compounds and polymers. Conventional reductive deuteration methods are limited by the high cost of deuterium sources (e.g., D₂ gas) and challenges in product separation and D₂O recycling. Electrochemical deuteration using D₂O is promising, but existing methods still suffer from low Faradaic efficiency (FE) and high separation costs. Herein, we report a deuterium ion diffusion-based all-solid electrolyser, featuring a RuO₂ anode for D + generation from pure D 2 O and a Pd/nitrogen-doped carbon-based liquid diffusion cathode (Pd δ+ /NC LDC) with tunable electron deficiencies Pd δ+ /NC to enhance selective deuteration. This system achieves over 99% selectivity for deuterated benzyl alcohol with a FE of 72%, and demonstrates broad applicability for the deuteration of aldehydes, ketones, imines, and alkenes with high FE and selectivity. Moreover, the Pd δ+ /NC-based electrolyser can achieve ten-gram-scale production of deuterated benzyl alcohol over 500 hours, showcasing its potential for high-throughput, solvent-free deuteration reactions in practical applications.
研究领域:
有机化学
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药物化学
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合成化学
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产品关联
DOI
PubMed
高影响因子
Gels
·
2024
·Vol. 10
·期 12
·808
·
IF 5
Feng Li,Ruoxi Yang,Jian Xu,Guohai Xu,Ye Wu
The concentration of small molecules reflects the normality of physiological processes in the human body, making the development of simple and efficient detection equipment essential. In this work, inspired by a facile strategy in point-of-care detection, two devices were fabricated to detect small molecules via photocurrent measurement. A linear response of the photocurrent against the concentration of the small molecules was found. In the first device, metal ions were introduced into gel substrates made by xanthan gum to enhance photocurrent response. N-phenyl-2-naphthylamine was measured when iron or manganese ions were used. L-Phenylalanine was measured when the gel was modified by samarium, iron, cerium, or ytterbium ions. L-(+)-Arabinose was detected via the gels modified by iron or holmium ions. D-(+)-Mannose was detected when the gel was modified by ytterbium, manganese, chromium, or sodium ions. L-Methionine was detected in the gels modified by samarium, zinc, or chromium ions. The second device was based on a paper sheet. A sugar-like molecule was first synthesized, which was then used to modify the paper. The detection was possible since the photocurrent showed a linear trend against the concentration of D-Trehalose. A linear fit was conducted to derive the sensitivity, whose value was found to be 5542.4. This work offers a novel, simple, and environmentally sustainable platform that is potentially useful in remote areas lacking medical devices.
研究领域:
生物医学工程
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分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Yanan Gao,Liwei Dou,Hong Gao,Jie Song,Shibin Shang,Zhanqian Song
D-π-D hole-transporting materials have the potential to be excellent dopant-free hole-transporting materials (HTMs) for perovskite solar cells (PSCs) because of their tunable energy levels, high charge mobility, good solubility, and excellent film-forming properties. In this paper, two series of D-π-D type compounds, Series 1 (2TPA-CZ1~2TPA-CZ3) and Series 2 (2DTPA-CZ1~2DTPA-CZ3), were synthesized by linking a carbazole derivative (as a π-bridge) to triaryamine or dehydroabietic acid triarylamine groups (the donor groups) via C–C coupling reactions. The optical, electrochemical, thermal, and photovoltaic properties in PSCs of these compounds were fully investigated. The two series of compounds exhibit good ultraviolet absorption, fluorescence emission , and electrochemical and thermal properties. In addition, their highest occupied molecular orbital levels and energy gaps make them suitable for use as hole-transporting materials in PSCs. Among the PSCs developed, Device 1, based on 2TPA-CZ1, showed the best performance, with a power conversion efficiency (PCE) of 12.27%, a open circuit voltage (V OC ) of 1.13 V, a short-circuit photocurrent density (J SC ) of 15.10 mA cm −2 , and a fill factor (FF) of 71.61%, which is comparable to that of a device based on the conventional hole-transporting material Spiro-OMeTAD. While the PCE of Devices 4–6 was lower than the PCE of Devices 1–3, Devices 4–6 exhibit better stability. This may be due to the higher T g and better film-forming properties of compounds formed using the dehydroabietic acid skeleton. In additional, the introduction of alkyl groups on the carbazole moiety decreased the efficiency of the PSC devices. These results demonstrate that the 2TPA-CZ1 compounds are promising HTMs for PSC applications.
研究领域:
材料科学
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能源科学
·
有机化学
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产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 3.475
Hong-Yan Wang,Yu-Li Xie,Xin Shi,Hong-Ling Shi,Jian-He Xu,Cun-Duo Tang,Lun-Guang Yao,Yun-Chao Kan
Halogenated mandelate and its derivatives are important scaffolds in chemical industry. However, the natural D -mandelate dehydrogenase (DMDH) showed relatively low catalytic activity toward D -o-chloromandelic acid, which largely limits the efficiency of dehydrogenation processes. To improve catalytic activity of Lactobacillus brevis D -mandelate dehydrogenase ( Lb DMDH) toward halogenated substrate, a D -mandelate dehydrogenase mutant Lb DMDH N253S with higher catalytic activity toward D -o-chloromandelic acid was successfully obtained by directed evolution, which was about 29 times of Lb DMDH. In addition, the temperature optimum of Lb DMDH N253S is 50 °C, and closer to the optimal growth temperature for Escherichia coli , indicating that it may be more advantageous in whole cell catalysis using living cells as catalysts. Meanwhile, the K cat value toward D -o-chloromandelic acid of Lb DMDH N253S is 2.08 s −1 , which is significantly higher than the one (0.09 s −1 ) of Lb DMDH, indicating that Lb DMDH N253S displayed higher catalytic efficiency toward D -o-chloromandelic acid. Then, we preliminarily explained the molecular basis for its catalytic performance by in silico design methods. All of these results established a solid foundation for molecular modification of DMDHs and the other industrial enzymes.
研究领域:
生物化学
·
酶工程
·
分子生物学
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2022
·
IF 3.318
Hua Li,Yang Wang,Ru Ding,Chen Chen,Zhixuan Tian,Hongnan Yin,Lieming Ding
A sensitive and reliable method was developed to determine befotertinib (D-0316) and its metabolite D-0865 from human plasma by LC-MS/MS. The samples were prepared by simple protein precipitation and 2 µL of the supernatant were chromatographed on a C18 analytical column (ACE Excel 2 Super C 18 , 50 × 2.1 mm). Elution was performed with mobile phase A (10 mM ammonium acetate in water containing 1 % formic acid) and mobile phase B (acetonitrile containing 1 % formic acid) under a gradient program in a total run time of 4 min. Triple Quadruple 5500 equipped with Turbo Ion Spray source and multiple reaction monitoring (MRM) were used for the analysis detection. The transitions were m / z 568.3 → 72.1 m / z (befotertinib), m / z 554.2 → 497.2 (D-0865), and m / z 455.2 → 164.9 (verapamil, internal standard). According to the Chinese Pharmacopeia Commission and ICH Harmonised Guideline for Bioanalytical Method Validation, this method was validated within the spectrum of its accuracy, precision, selectivity, linearity, recovery, matrix effect, and stability. This LC-MS/MS method was successfully applied for the quantitation of befotertinib and its metabolite D-0865 in human plasma during the pharmacokinetics study of befotertinib in non-small cell lung cancer (NSCLC) patients.
研究领域:
药物分析
·
临床药理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2018
·
IF 4.805
Zhen-Hua Li,Zhi-Jiang Jiang,Qiao-Ling Shao,Jin-Jing Qin,Qiang-Feng Shu,Wen-Hao Lu,Wei-Ke Su
A one-pot cascade heterocyclization strategy has been developed for the synthesis of 2,4-dichloro-substituted pyrano[2,3-d]pyrimidines and furo[2,3-d]pyrimidines from linear γ- and β-ketomalononitriles using triphosgene and triphenylphosphine oxide. The reaction afforded synthetic useful products with moderate to good yields, bypassing the conventional harsh conditions of chlorination. The mechanistic study revealed that the reaction proceeded with a non-isocyanate route, and the second step may conduct in a triphenylphosphine oxide-catalyzed manner.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
PubMed
高影响因子
Theranostics
·
2018
·
IF 8.537
Zhenyuan Bian,Jin Yan,Simeng Wang,Yijie Li,Yi Guo,Bohan Ma,Hao Guo,Zhijie Lei,Chun Yin,Yi Zhou,Min Liu,Kaishan Tao,Peng Hou,Wangxiao He
Peptides are a rapidly growing class of therapeutics with many advantages over conventional small molecule drugs. Dextrorotary (D)-peptides, with increased enzymatic stability and prolonged plasma half-life in comparison with natural L-peptides, are considered to have great potential as recognition molecules and therapeutic agents. However, the in vivo efficacy of current therapeutic D-peptides is hindered by their inefficient cellular uptake in diseased tissues. Methods: To overcome physiological and cellular barriers to D-peptides, we designed a gold-based ultra-small nanocarrier coupled with polylysine (PLL) and a receptor-targeted peptide to deliver therapeutic D-peptides. Using a D-peptide p53 activator (DPA) as a proof of concept, we synthesized, functionalized and characterized gold- and DPA-based nanoparticles termed AuNP-DPA. Results: AuNP-DPA were effectively enriched in tumor sites and subsequently internalized by cancer cells, thereby suppressing tumor growth via reactivating p53 signaling. More importantly, through a series of in vivo experiments, AuNP-DPA showed excellent biosafety without the common side effects that hinder p53 therapies in clinic trials. Conclusion: The present study not only sheds light on the development of AuNP-DPA as a novel class of antitumor agents for drugging the p53 pathway in vivo, but also supplies a new strategy to use D-peptides as intracellular PPI inhibitors for cancer-targeted therapy.
研究领域:
生物医学
·
纳米医学
·
癌症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）