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Feng Zhang Broad

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https://www.readbyqxmd.com/read/27899283/a-high-throughput-microtiter-plate-assay-for-the-discovery-of-active-and-enantioselective-amino-alcohol-specific-transaminases
#1
Jian-Dong Zhang, Hua-Lei Wu, Tong Meng, Chao-Feng Zhang, Xiao-Jun Fan, Hong-Hong Chang, Wen-Long Wei
Chiral vicinal amino alcohols are important chiral building blocks and intermediates in the pharmaceutical industry. The transaminase (TAm) catalyzed kinetic resolution of racemic amino alcohols provides a straightforward approach to access these important compounds. This study describes the development of a novel microtiter plate assay to screen vicinal amino alcohol-specific TAms using a tetrazolium red-based colorimetric assay to monitor the rate of α-hydroxy ketone formation at 510 nm. This approach is the first to determine the Michaelis-Menten parameters for a recombinant TAm (PpbauA) from Pseudomonas putida NBRC14164...
November 27, 2016: Analytical Biochemistry
https://www.readbyqxmd.com/read/27890732/programmed-near-infrared-light-responsive-drug-delivery-system-for-combined-magnetic-tumor-targeting-magnetic-resonance-imaging-and-chemo-phototherapy
#2
Qianhua Feng, Yuanyuan Zhang, Wanxia Zhang, Yongwei Hao, Yongchao Wang, Hongling Zhang, Lin Hou, Zhenzhong Zhang
: In this study, an intelligent drug delivery system was developed by capping doxorubicin (DOX)-loaded hollow mesoporous CuS nanoparticles (HMCuS NPs) with superparamagnetic iron oxide nanoparticles (IONPs). Under near infrared (NIR) light irradiation, the versatile HMCuS NPs could exploit the merits of both photothermal therapy (PTT) and photodynamic therapy (PDT) simultaneously. Herein, the multifunctional IONPs as gatekeeper with the enhanced capping efficiency were supposed to realize "zero premature release" and minimize the adverse side effects during the drug delivery in vivo...
November 24, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27874082/ultra-broadband-reflective-metamaterial-with-rcs-reduction-based-on-polarization-convertor-information-entropy-theory-and-genetic-optimization-algorithm
#3
Si Jia Li, Xiang Yu Cao, Li Ming Xu, Long Jian Zhou, Huan Huan Yang, Jiang Feng Han, Zhao Zhang, Di Zhang, Xiao Liu, Chen Zhang, Yue Jun Zheng, Yi Zhao
We proposed an ultra-broadband reflective metamaterial with controlling the scattering electromagnetic fields based on a polarization convertor. The unit cell of the polarization convertor was composed of a three layers substrate with double metallic split-rings structure and a metal ground plane. The proposed polarization convertor and that with rotation angle of 90 deg had been employed as the "0" and "1" elements to design the digital reflective metamaterial. The numbers of the "0" and "1" elements were chosen based on the information entropy theory...
November 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27866260/isolation-and-characterization-of-a-novel-cadmium-regulated-yellow-stripe-like-transporter-snysl3-in-solanum-nigrum
#4
Shanshan Feng, Jinjuan Tan, Yuxiu Zhang, Shuang Liang, Shuqin Xiang, Hong Wang, Tuanyao Chai
SnYSL3 encodes a plasma-localized transporter delivering various metal-nicotianamine complexes. The expression of SnYSL3 is up-regulated by excess Cd, suggesting an important role for SnYSL3 in response to Cd stress. The Yellow Stripe-Like (YSL) transporters have been proposed to participate in metal uptake and long-range transport in model plants. In this study, we isolated and characterized a novel member of the YSL gene family, SnYSL3, from the cadmium hyperaccumulator Solanum nigrum. SnYSL3 was constitutively expressed and encodes a plasma membrane-localized protein...
November 19, 2016: Plant Cell Reports
https://www.readbyqxmd.com/read/27862459/enantioselective-synthesis-of-n-h-free-1-5-benzothiazepines
#5
Guojin Wang, Yu Tang, Yu Zhang, Xiaohua Liu, Lili Lin, Xiaoming Feng
An enantioselective sulfa-Michael-cyclization reaction was developed for the synthesis of 1,5-benzothiazepines with versatile pharmacological activities. The reaction between 2-aminothiophenol and α,β-unsaturated pyrazoleamides gave direct access to N-H-free 1,5-benzothiazepines in the presence of a chiral N,N'-dioxide/Yb(OTf)3 complex. Excellent enantioselectivities (up to 96 % ee) and high yields (up to 99 %) were obtained for a broad range of substrates under mild reaction conditions. This method provided a facile approach to the antidepressant drug (R)-(-)-Thiazesim...
November 15, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27852038/transcriptomic-metabolomic-reprogramming-in-egfr-mutant-nsclc-early-adaptive-drug-escape-linking-tgf%C3%AE-2-bioenergetics-mitochondrial-priming
#6
Praveena S Thiagarajan, Xiaoliang Wu, Wei Zhang, Ivy Shi, Rakesh Bagai, Patrick Leahy, Yan Feng, Martina Veigl, Daniel Lindner, David Danielpour, Lihong Yin, Rafael Rosell, Trever G Bivona, Zhenfeng Zhang, Patrick C Ma
The impact of EGFR-mutant NSCLC precision therapy is limited by acquired resistance despite initial excellent response. Classic studies of EGFR-mutant clinical resistance to precision therapy were based on tumor rebiopsies late during clinical tumor progression on therapy. Here, we characterized a novel non-mutational early adaptive drug-escape in EGFR-mutant lung tumor cells only days after therapy initiation, that is MET-independent. The drug-escape cell states were analyzed by integrated transcriptomic and metabolomics profiling uncovering a central role for autocrine TGFβ2 in mediating cellular plasticity through profound cellular adaptive Omics reprogramming, with common mechanistic link to prosurvival mitochondrial priming...
November 11, 2016: Oncotarget
https://www.readbyqxmd.com/read/27825886/upconversion-nanoparticles-based-fret-aptasensor-for-rapid-and-ultrasenstive-bacteria-detection
#7
Birui Jin, Shurui Wang, Min Lin, Ying Jin, Shujing Zhang, Xingye Cui, Yan Gong, Ang Li, Feng Xu, Tian Jian Lu
Pathogenic bacteria cause serious harm to human health, which calls for the development of advanced detection methods. Herein, we developed a novel detection platform based on fluorescence resonance energy transfer (FRET) for rapid, ultrasensitive and specific bacteria detection, where gold nanoparticles (AuNPs, acceptor) were conjugated with aptamers while upconversion nanoparticles (UCNPs, donor) were functionalized with corresponding complementary DNA (cDNA). The spectral overlap between UCNPs fluorescence emission and AuNPs absorption enables the occurrence of FRET when hybridizing the targeted aptamer and cDNA, causing upconversion fluorescence quenching...
October 19, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27816473/characterization-of-soluble-n-ethylmaleimide-sensitive-factor-attachment-protein-receptor-gene-stx18-variations-for-possible-roles-in-congenital-heart-diseases
#8
Xia Li, Shuai Shi, Fei-Feng Li, Rui Cheng, Ying Han, Li-Wei Diao, Qiong Zhang, Ji-Xin Zhi, Shu-Lin Liu
Congenital heart disease (CHD) is among the most prevalent and complex congenital anatomic malformations in newborns. Interactions of cardiac progenitor with a broad range of cellular regulatory factors play key roles in the formation of mammalian heart and pathogenesis of CHD. STX18 is a soluble N-ethylmaleimide-sensitive factor attachment protein receptor, which is involved in numeral cellular activities such as organelle assembly and the cell cycle. The aim of this work was to find evidence on whether STX18 variations might be associated with CHD in Chinese Han populations...
November 2, 2016: Gene
https://www.readbyqxmd.com/read/27802292/clinical-and-epidemiologic-characteristics-of-hospitalized-patients-with-laboratory-confirmed-respiratory-syncytial-virus-infection-in-eastern-china-between-2009-and-2013-a-retrospective-study
#9
Dawei Cui, Luzhao Feng, Yu Chen, Shengjie Lai, Zike Zhang, Fei Yu, Shufa Zheng, Zhongjie Li, Hongjie Yu
Respiratory syncytial virus (RSV) is a leading cause of morbidity and mortality worldwide in children aged <5 years and older adults with acute lower respiratory infections (ALRIs). However, few studies regarding the epidemiology of hospitalizations for RSV infection have been performed previously in China. Here, we aimed to describe the clinical and epidemiologic characteristics of hospitalized patients with laboratory-confirmed RSV infection in eastern China. Active surveillance for hospitalized ALRI patients using a broad case definition based on symptoms was performed from 2009-2013 in 12 sentinel hospitals in eastern China...
2016: PloS One
https://www.readbyqxmd.com/read/27774592/rifampicin-attenuates-experimental-autoimmune-encephalomyelitis-by-inhibiting-pathogenic-th17-cells-responses
#10
Ke Ma, Xi Chen, Jia-Cheng Chen, Ying Wang, Xi-Meng Zhang, Fan Huang, Jun-Jiong Zheng, Xiong Chen, Wei Yu, Ke-Ling Cheng, Yan-Qing Feng, Huai-Yu Gu
Rifampicin, a broad-spectrum antibiotic, has neuroprotective, immunosuppressive, and anti-inflammatory properties. However, the effect of rifampicin on autoimmune disorders of the nervous system is not clear. In this study, we investigated whether rifampicin was beneficial to myelin oligodendrocyte glycoprotein peptide (MOG33-35 )-induced female C57BL/6 experimental autoimmune encephalomyelitis (EAE) mice, the well-established animal model of multiple sclerosis. Rifampicin treatment (daily from the first day after EAE immunization) remarkably attenuated clinical signs and loss of body weight, which are associated with suppression of inflammatory infiltration and demyelination in spinal cords of EAE mice...
October 23, 2016: Journal of Neurochemistry
https://www.readbyqxmd.com/read/27762064/ccnd1-bcl2-gene-network-a-direct-target-of-amifostine-in-human-acute-megakaryocytic-leukemia-cells
#11
Feng Zhang, Bo Yang, Kailiang Zhang, Mei-Ling Hou, Xue-Chun Lu, Yu-Xin Li
Amifostine (AMF), 2-(3-Aminopropyl) aminoethyl phosphorothioate is a broad-spectrum cytoprotective agent used to treat nuclear radiation and chemical weapon injuries. Recently, amifostine has been shown to have a profound biological influence on tumor cells. In order to examine the effects and mechanisms underlying the effects of amifostine on human acute megakaryocytic leukemia, we evaluated the efficacy of amifostine against Dami cells and observed a cell cycle arrest in G2 /M phase. Amifostine treatment also induced cell apoptosis of Dami cells which corresponds to formal studies...
October 19, 2016: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/27722557/merging-photoredox-with-copper-catalysis-decarboxylative-difluoroacetylation-of-%C3%AE-%C3%AE-unsaturated-carboxylic-acids-with-icf2co2et
#12
Heng-Rui Zhang, Dao-Qian Chen, Ya-Ping Han, Yi-Feng Qiu, Dong-Po Jin, Xue-Yuan Liu
A photoredox-/copper-catalyzed decarboxylative difluoroacetylation reaction of α,β-unsaturated carboxylic acids has been developed. This reaction produces a variety of difluoroalkylated alkenes in moderate to excellent yields and exhibits satisfactory stereoselectivity and a broad substrate scope at ambient temperature. Furthermore, this decarboxylative difluoroacetylation protocol provides efficient and environment friendly access to the difluoroalkylated alkenes.
September 27, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27717328/nationwide-distribution-of-varicella-zoster-virus-clades-in-china
#13
Songtao Xu, Mukai Chen, Huanying Zheng, Haiyan Wang, Meng Chen, Jianhui Zhou, Wang Shuang, Pengbo Yu, Chaofeng Ma, Jilan He, Daxing Feng, Zhu Zhen, Zhang Yan, Mao Naiying, Aili Cui, Qiuhua Wu, Mengyuan Qi, Chongshan Li, Xiaoguang Xu, Wenbo Xu
BACKGROUND: In 2010, a universal nomenclature for varicella-zoster virus (VZV) clades was established, which is very useful in the monitoring of viral evolution, recombination, spread and genetic diversity. Currently, information about VZV clades has been disclosed worldwide, however, there are limited data regarding the characterization of circulating VZV clades in China, even where varicella remains widely epidemic. METHODS: From 2008 to 2012, clinical samples with varicella or zoster were collected in General Hospital in eight provinces and analyzed by PCR, restriction endonuclease digestion and sequencing...
October 7, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27714339/curvature-induced-hierarchical-wrinkling-patterns-in-soft-bilayers
#14
Zhi-Chun Shao, Yan Zhao, Wanyu Zhang, Yanping Cao, Xi-Qiao Feng
Sinusoidal wrinkling will occur in a planar film-substrate bilayer when the uniaxial compressive strain imposed to the system exceeds a critical value. However, when a core-shell soft cylinder is subjected to axial compression, surface wrinkling patterns may evolve from the sinusoidal mode to the diamond-like mode, depending on the modular ratio and the curvature of the system. Inspired by this phenomenon, we here propose a simple yet robust strategy to fabricate hierarchical wrinkling patterns by controlling the curvature of a film-substrate system...
September 28, 2016: Soft Matter
https://www.readbyqxmd.com/read/27713529/a-novel-proposal-of-a-simplified-bacterial-gene-set-and-the-neo-construction-of-a-general-minimized-metabolic-network
#15
Yuan-Nong Ye, Bin-Guang Ma, Chuan Dong, Hong Zhang, Ling-Ling Chen, Feng-Biao Guo
A minimal gene set (MGS) is critical for the assembly of a minimal artificial cell. We have developed a proposal of simplifying bacterial gene set to approximate a bacterial MGS by the following procedure. First, we base our simplified bacterial gene set (SBGS) on experimentally determined essential genes to ensure that the genes included in the SBGS are critical. Second, we introduced a half-retaining strategy to extract persistent essential genes to ensure stability. Third, we constructed a viable metabolic network to supplement SBGS...
October 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27678161/stereoselective-alkoxycarbonylation-of-unactivated-c-sp3-h-bonds-with-alkyl-chloroformates-via-pd-ii-pd-iv-catalysis
#16
Gang Liao, Xue-Song Yin, Kai Chen, Qi Zhang, Shuo-Qing Zhang, Bing-Feng Shi
Several examples on Pd-catalysed carbonylation of methyl C(sp(3))-H bonds with gaseous CO via Pd(II)/Pd(0) catalysis have been reported. However, methylene C(sp(3))-H carbonylation remains a great challenge, largely due to the lack of reactivity of C-H bonds and the difficulty in CO migratory insertion. Herein, we report the stereoselective alkoxycarbonylation of both methyl and methylene C(sp(3))-H bonds with alkyl chloroformates through a Pd(II)/Pd(IV) catalytic cycle. A broad range of aliphatic carboxamides and alkyl chloroformates are compatible with this protocol...
2016: Nature Communications
https://www.readbyqxmd.com/read/27626382/allelic-reprogramming-of-the-histone-modification-h3k4me3-in-early-mammalian-development
#17
Bingjie Zhang, Hui Zheng, Bo Huang, Wenzhi Li, Yunlong Xiang, Xu Peng, Jia Ming, Xiaotong Wu, Yu Zhang, Qianhua Xu, Wenqiang Liu, Xiaochen Kou, Yanhong Zhao, Wenteng He, Chong Li, Bo Chen, Yuanyuan Li, Qiujun Wang, Jing Ma, Qiangzong Yin, Kehkooi Kee, Anming Meng, Shaorong Gao, Feng Xu, Jie Na, Wei Xie
Histone modifications are fundamental epigenetic regulators that control many crucial cellular processes. However, whether these marks can be passed on from mammalian gametes to the next generation is a long-standing question that remains unanswered. Here, by developing a highly sensitive approach, STAR ChIP-seq, we provide a panoramic view of the landscape of H3K4me3, a histone hallmark for transcription initiation, from developing gametes to post-implantation embryos. We find that upon fertilization, extensive reprogramming occurs on the paternal genome, as H3K4me3 peaks are depleted in zygotes but are readily observed after major zygotic genome activation at the late two-cell stage...
September 14, 2016: Nature
https://www.readbyqxmd.com/read/27622244/multidrug-resistant-cancer-cells-and-cancer-stem-cells-hijack-cellular-systems-to-circumvent-systemic-therapies-can-natural-products-reverse-this
#18
Qian Zhang, Yunjiang Feng, Derek Kennedy
Chemotherapy is one of the most effective and broadly used approaches for cancer management and many modern regimes can eliminate the bulk of the cancer cells. However, recurrence and metastasis still remain a major obstacle leading to the failure of systemic cancer treatments. Therefore, to improve the long-term eradication of cancer, the cellular and molecular pathways that provide targets which play crucial roles in drug resistance should be identified and characterised. Multidrug resistance (MDR) and the existence of tumor-initiating cells, also referred to as cancer stem cells (CSCs), are two major contributors to the failure of chemotherapy...
September 12, 2016: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/27606599/an-alternative-strategy-for-pan-acetyl-lysine-antibody-generation
#19
Sun-Yee Kim, Choon Kiat Sim, Qiongyi Zhang, Hui Tang, Reinhard Brunmeir, Hong Pan, Neerja Karnani, Weiping Han, Kangling Zhang, Feng Xu
Lysine acetylation is an important post-translational modification in cell signaling. In acetylome studies, a high-quality pan-acetyl-lysine antibody is key to successful enrichment of acetylated peptides for subsequent mass spectrometry analysis. Here we show an alternative method to generate polyclonal pan-acetyl-lysine antibodies using a synthesized random library of acetylated peptides as the antigen. Our antibodies are tested to be specific for acetyl-lysine peptides/proteins via ELISA and dot blot. When pooled, five of our antibodies show broad reactivity to acetyl-lysine peptides, complementing a commercial antibody in terms of peptide coverage...
2016: PloS One
https://www.readbyqxmd.com/read/27571141/nickel-catalyzed-ortho-arylation-of-unactivated-hetero-aryl-c-h-bonds-with-arylsilanes-using-a-removable-auxiliary
#20
Sheng Zhao, Bin Liu, Bei-Bei Zhan, Wei-Dong Zhang, Bing-Feng Shi
Ni(II)-catalyzed ortho-arylation of aromatic and heteroaromatic carboxamides with triethoxy(aryl)silanes assisted by a removable bidentate auxiliary is reported. This transformation features a broad substrate scope, good functional group tolerance, and compatibility with heterocyclic substrates. Compared to the well-established Ni(II)-catalyzed C-H arylation with ArX or aryliodonium salts via oxidative addition, this reaction proceeded via a fluoride-promoted transmetalation.
September 16, 2016: Organic Letters
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