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Yifan Cheng

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https://www.readbyqxmd.com/read/29304101/fab-based-inhibitors-reveal-ubiquitin-independent-functions-for-hiv-vif-neutralization-of-apobec3-restriction-factors
#1
Jennifer M Binning, Amber M Smith, Judd F Hultquist, Charles S Craik, Nathalie Caretta, Melody G Campbell, Lily Burton, Florencia La Greca, Michael J McGregor, Hai M Ta, Koen Bartholomeeusen, B Matija Peterlin, Nevan J Krogan, Natalia Sevillano, Yifan Cheng, John D Gross
The lentiviral protein Viral Infectivity Factor (Vif) counteracts the antiviral effects of host APOBEC3 (A3) proteins and contributes to persistent HIV infection. Vif targets A3 restriction factors for ubiquitination and proteasomal degradation by recruiting them to a multi-protein ubiquitin E3 ligase complex. Here, we describe a degradation-independent mechanism of Vif-mediated antagonism that was revealed through detailed structure-function studies of antibody antigen-binding fragments (Fabs) to the Vif complex...
January 5, 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29282501/confirmatory-surface-analysis-of-equivocal-documents-with-pigment-based-gel-inks-via-laser-desorption-laser-postionization-mass-spectrometry-imaging
#2
Rong Liu, Zhibin Yin, Xiaoling Cheng, Yifan Meng, Wei Hang, Benli Huang
Laser desorption laser postionization time-of-flight mass spectrometry (L2MS) was applied for unambiguous discrimination of pigment-based inks in blue, black, and red gel pens and molecular imaging of equivocal documents in a quasi-non-destructive way. In comparison to laser desorption mass spectrometry (LD-MS), additional discriminatory information on ink components is acquired uniquely, facilitating the distinct differentiation of various pigmented gel inks. More importantly, diversified images of additional characteristic ions achieved using L2MS offer reliable support to discriminate forged documents and decipher important hidden contents...
December 28, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29236684/cryo-em-structures-of-the-tmem16a-calcium-activated-chloride-channel
#3
Shangyu Dang, Shengjie Feng, Jason Tien, Christian J Peters, David Bulkley, Marco Lolicato, Jianhua Zhao, Kathrin Zuberbühler, Wenlei Ye, Lijun Qi, Tingxu Chen, Charles S Craik, Yuh Nung Jan, Daniel L Minor, Yifan Cheng, Lily Yeh Jan
Calcium-activated chloride channels (CaCCs) encoded by TMEM16A control neuronal signalling, smooth muscle contraction, airway and exocrine gland secretion, and rhythmic movements of the gastrointestinal system. To understand how CaCCs mediate and control anion permeation to fulfil these physiological functions, knowledge of the mammalian TMEM16A structure and identification of its pore-lining residues are essential. TMEM16A forms a dimer with two pores. Previous CaCC structural analyses have relied on homology modelling of a homologue (nhTMEM16) from the fungus Nectria haematococca that functions primarily as a lipid scramblase, as well as subnanometre-resolution electron cryo-microscopy...
December 13, 2017: Nature
https://www.readbyqxmd.com/read/29217581/structure-of-the-human-trpm4-ion-channel-in-a-lipid-nanodisc
#4
Henriette E Autzen, Alexander G Myasnikov, Melody G Campbell, Daniel Asarnow, David Julius, Yifan Cheng
Transient receptor potential (TRP) melastatin 4 (TRPM4) is a widely expressed cation channel associated with a variety of cardiovascular disorders. TRPM4 is activated by increased intracellular calcium in a voltage dependent manner, but unlike many other TRP channels is permeable to monovalent cations only. Here we present two structures of full-length human TRPM4 embedded in lipid nanodiscs at ~3Å resolution as determined by single particle electron cryo-microscopy. These structures, with and without calcium bound, reveal a general architecture for this major subfamily of TRP channels and a well-defined calcium binding site within the intracellular side of the S1-S4 domain...
December 7, 2017: Science
https://www.readbyqxmd.com/read/29195065/how-cryo-em-became-so-hot
#5
Yifan Cheng, Robert M Glaeser, Eva Nogales
The Royal Swedish Academy of Sciences awarded the 2017 Nobel Prize for Chemistry to Jacques Dubochet, Joachim Frank, and Richard Henderson for "developing cryoelectron microscopy for the high-resolution structure determination of biomolecules in solution." Achieving this goal, which required innovation, persistence, and uncommon physical insight, has broadened horizons for structural studies in molecular and cell biology.
November 30, 2017: Cell
https://www.readbyqxmd.com/read/29164226/nicking-enzyme-controlled-toehold-regulation-for-dna-logic-circuits
#6
Linqiang Pan, Zhiyu Wang, Yifan Li, Fei Xu, Qiang Zhang, Cheng Zhang
DNA strand displacement is widely used in DNA-related nanoengineering for its remarkable specificity and predictability. We report a nicking enzyme-assisted mechanism to regulate strand displacement, where DNA toeholds are dynamically controlled. To demonstrate the strategy, a protein/DNA-based Boolean operation system is constructed and based on it a two-channel multiplexer controlled by three different nicking enzymes is realized. The proposed regulatory mechanism can be used for switch logic statement and bridges protein and DNA logic circuits...
November 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/29162875/effect-of-aerobic-exercise-and-diet-on-liver-fat-in-pre-diabetic-patients-with-non-alcoholic-fatty-liver-disease-a-randomized-controlled-trial
#7
Sulin Cheng, Jun Ge, Can Zhao, Shenglong Le, Yifan Yang, Dandan Ke, Na Wu, Xiao Tan, Xiaobo Zhang, Xiaming Du, Jianqin Sun, Renwei Wang, Yongyong Shi, Ronald J H Borra, Riitta Parkkola, Petri Wiklund, Dajiang Lu
The study aimed to assess whether aerobic exercise (AEx) training and a fibre-enriched diet can reduce hepatic fat content (HFC) and increase glycaemic control in pre-diabetic patients with non-alcoholic fatty liver disease (NAFLD). Six-hundred-and-three patients from seven clinics in Yangpu district, Shanghai, China were recruited. Of them 115 individuals aged 50-65-year fulfilled the inclusion criteria (NAFLD with impaired fasting glucose or impaired glucose tolerance) and were randomly assigned into exercise (AEx n = 29), diet (Diet n = 28), exercise plus diet (AED n = 29), or no-intervention (NI n = 29) groups...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29132042/long-range-interactions-keep-bacterial-cells-from-liquid-solid-interfaces-evidence-of-a-bacteria-exclusion-zone-near-nafion-surfaces-and-possible-implications-for-bacterial-attachment
#8
Yifan Cheng, Carmen I Moraru
Hydrophilic surfaces of both abiotic and biological origin have been shown to bear particle-exclusion zones as large as hundreds of micrometers at liquid-solid interfaces. Here we present the first systematic investigation and evidence for bacteria-free exclusion zones for several bacterial strains, including pathogens associated with hospital infections and/or foodborne outbreaks: Staphylococcus aureus, Escherichia coli O157:H7, and Listeria monocytogenes. Tests were carried out both in a phosphate buffer, as well as triptic soy broth (TSB) of high ionic strength...
November 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29113239/cd109-expression-is-upregulated-in-penile-squamous-cell-carcinoma
#9
Fengyun Dong, Jin Wang, Yinghua Xu, Zuowang Cheng, Xiaocui Chen, Yifan Wang, Ju Liu
Cluster of differentiation (CD) 109 is a glycosylphosphatidylinositol-anchored cell surface glycoprotein and a co-receptor for transforming growth factor β. The expression of CD109 has been detected in squamous cell carcinoma of the lung, esophagus, skin and gallbladder. The aim of the present study was to evaluate CD109 expression in penile squamous cell carcinoma (PSCC). CD109 expression in PSCC tumor and adjacent tissues from 45 specimens in tissue microarrays was examined by immunohistochemical analyses...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29092494/high-precision-multi-node-clock-network-distribution
#10
Xing Chen, Yifan Cui, Xing Lu, Cheng Ci, Xuesong Zhang, Bo Liu, Hong Wu, Tingsong Tang, Kebin Shi, Zhigang Zhang
A high precision multi-node clock network for multiple users was built following the precise frequency transmission and time synchronization of 120 km fiber. The network topology adopts a simple star-shaped network structure. The clock signal of a hydrogen maser (synchronized with UTC) was recovered from a 120 km telecommunication fiber link and then was distributed to 4 sub-stations. The fractional frequency instability of all substations is in the level of 10(-15) in a second and the clock offset instability is in sub-ps in root-mean-square average...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29071494/highly-efficient-isolation-and-release-of-circulating-tumor-cells-based-on-size-dependent-filtration-and-degradable-zno-nanorods-substrate-in-a-wedge-shaped-microfluidic-chip
#11
Songzhan Li, Yifan Gao, Xiran Chen, Luman Qin, Boran Cheng, Shubin Wang, Shengxiang Wang, Guangxin Zhao, Kan Liu, Nangang Zhang
Circulating tumor cells (CTCs) have been regarded as the major cause of metastasis, holding significant insights for tumor diagnosis and treatment. Although many efforts have been made to develop methods for CTC isolation and release in microfluidic system, it remains significant challenges to realize highly efficient isolation and gentle release of CTCs for further cellular and bio-molecular analyses. In this study, we demonstrate a novel method for CTC isolation and release using a simple wedge-shaped microfluidic chip embedding degradable znic oxide nanorods (ZnNRs) substrate...
October 25, 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/29070851/association-of-leisure-time-physical-activity-and-nmr-detected-circulating-amino-acids-in-peripubertal-girls-a-7-5-year-longitudinal-study
#12
Xiaobo Zhang, Petri Wiklund, Na Wu, Yifan Yang, Haihui Zhuang, Sulin Cheng
This study investigated the longitudinal associations of physical activity and circulating amino acids concentration in peripubertal girls. Three hundred ninety-six Finnish girls participated in the longitudinal study from childhood (mean age 11.2 years) to early adulthood (mean age 18.2 years). Circulating amino acids were assessed by nuclear magnetic resonance spectroscopy. LTPA was assessed by self-administered questionnaire. We found that isoleucine, leucine and tyrosine levels were significantly higher in individuals with lower LTPA than their peers at age 11 (p < 0...
October 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28976767/programmable-regulation-of-dna-conjugation-to-gold-nanoparticles-via-strand-displacement
#13
Cheng Zhang, Ranfeng Wu, Yifan Li, Qiang Zhang, Jing Yang
Methods for conjugating DNA to gold nanoparticles (AuNPs) have recently attracted considerable attention. The ability to control such conjugation in a programmable way is of great interest. Here, we have developed a logic-based method for manipulating the conjugation of thiolated DNA species to AuNPs via cascading DNA strand displacement. Using this method, several logic-based operation systems are established and up to three kinds of DNA signals are introduced at the same time. In addition, a more sensitive catalytic logic-based operation is also achieved based on an entropy-driven process...
October 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28934548/controlling-styrene-maleic-acid-lipid-particles-through-raft
#14
Anton A A Smith, Henriette E Autzen, Tomas Laursen, Vincent Wu, Max Yen, Aaron Hall, Scott D Hansen, Yifan Cheng, Ting Xu
The ability of styrene maleic acid copolymers to dissolve lipid membranes into nanosized lipid particles is a facile method of obtaining membrane proteins in solubilized lipid discs while conserving part of their native lipid environment. While the currently used copolymers can readily extract membrane proteins in native nanodiscs, their highly disperse composition is likely to influence the dispersity of the discs as well as the extraction efficiency. In this study, reversible addition-fragmentation chain transfer was used to control the polymer architecture and dispersity of molecular weights with a high-precision...
October 9, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28919177/effects-of-gnrhr-polymorphisms-on-sperm-quality-in-chinese-water-buffalo
#15
Gang Wang, Linlin Hao, Yunyun Cheng, Shuai Li, Yu Zhang, Chen Lv, Wenzhen Wei, Shan Huang, Hongyu Shi, Lijie Dong, Yifan Zhang, Hao Yu, Jiabao Zhang
Gonadotropin-releasing hormone receptor (GnRHR) plays a critical physiological role in animal reproduction and is a potential marker for improving sperm quality. In the present study, eight SNPs (g.539T>C, g.640A>G, g.655T>C, g.707T>C, g.812A>G, g.18951A>T g.16867T>C and g.18953Indel GGCAAAGTAA) were detected in the GnRHR gene from one-hundred-sixty-five water buffalo by direct sequencing and identification of overlapping peaks. All SNPs were associated significantly with the ejaculate volume and two genes (g...
November 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28899098/heterodimers-made-of-upconversion-nanoparticles-and-metal-organic-frameworks
#16
Yifan Li, Zhenghan Di, Jinhong Gao, Ping Cheng, Chunzhi Di, Ge Zhang, Bei Liu, Xinghua Shi, Ling-Dong Sun, Lele Li, Chun-Hua Yan
Creating nanoparticle dimers has attracted extensive interest. However, it still remains a great challenge to synthesize heterodimers with asymmetric compositions and synergistically enhanced functions. In this work, we report the synthesis of high quality heterodimers composed of porphyrinic nanoscale metal-organic frameworks (nMOF) and lanthanide-doped upconversion nanoparticles (UCNPs). Due to the dual optical properties inherited from individual nanoparticles and their interactions, absorption of low energy photons by the UCNPs is followed by energy transfer to the nMOFs, which then undergo activation of porphyrins to generate singlet oxygen...
September 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28842939/a-one-dimensional-fluidic-nanogenerator-with-a-high-power-conversion-efficiency
#17
Yifan Xu, Peining Chen, Jing Zhang, Songlin Xie, Fang Wan, Jue Deng, Xunliang Cheng, Yajie Hu, Meng Liao, Bingjie Wang, Xuemei Sun, Huisheng Peng
Electricity generation from flowing water has been developed for over a century and plays a critical role in our lives. Generally, heavy and complex facilities are required for electricity generation, while using these technologies for applications that require a small size and high flexibility is difficult. Here, we developed a fluidic nanogenerator fiber from an aligned carbon nanotube sheet to generate electricity from any flowing water source in the environment as well as in the human body. The power conversion efficiency reached 23...
August 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28828929/prognostic-value-of-serum-thioredoxin-levels-in-ischemic-stroke
#18
Tieer Yu, Wanli Zhang, Yuanshao Lin, Qian Li, Jie Xue, Zhengyi Cai, Yifan Cheng, Bei Shao
OBJECTIVES: Thioredoxin (Trx) is one of significant antioxidative molecules to diminish oxidative stress. Current evidence suggests that Trx is a potent antioxidant with cytoprotective functions. The aim of our study was to investigate specifically the association between serum Trx levels and acute ischemic stroke (AIS) patients. METHODS: 198 AIS patients and 75 controls were enrolled to the study. Serum Trx levels were measured using an enzyme-linked immunosorbent assay (ELISA)...
August 22, 2017: Neurological Research
https://www.readbyqxmd.com/read/28819881/resveratrol-induces-apoptosis-and-inhibits-adipogenesis-by-stimulating-the-sirt1-ampk%C3%AE-foxo1-signalling-pathway-in-bovine-intramuscular-adipocytes
#19
Xiaomu Liu, Hongbo Zhao, Qing Jin, Wei You, Haijian Cheng, Yifan Liu, Enliang Song, Guifen Liu, Xiuwen Tan, Xianglun Zhang, Fachun Wan
Sirtuin type 1 (SIRTl) and AMP-activated protein kinase (AMPK) play important roles in regulating energy metabolism, cell proliferation and differentiation, ageing, apoptosis, and metabolism. The effect of 100, 200, and 400 μm Resveratrol (RES), an activator of SIRT1, on apoptosis of bovine intramuscular adipocytes was investigated by nuclear staining, flow cytometry, quantitative real-time polymerase chain reaction, and western blotting. Results show that RES inhibited adipogenesis, decreased cell viability, and increased apoptotic rates in a dose-dependent way...
August 17, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28810891/the-variation-in-urinary-calcium-levels-in-adult-patients-with-fracture-and-surgical-intervention
#20
Junfei Wang, Xin Zheng, Liming Zhang, Yifan Zhang, Jin Xiong, Yixin Cheng, Hongfei Shi, Xusheng Qiu, Leqin Zhou, Xizhao Sun
BACKGROUND: Generally, a higher calcium diet is fed to fracture patients after surgery. However, recent studies have indicated that higher dietary calcium intakes increase the risk of urinary stones for fracture patients. Therefore, this study aimed to observe the variation in urinary calcium levels among fracture patients who underwent surgery, based on fracture type, fracture location, age and gender. METHODS: A total of 768 subjects were enrolled in this study from 2012 to 2015 and were divided into 2 groups: group A (fracture patients who underwent surgery) and group B (normal patients without fracture)...
August 15, 2017: Journal of Orthopaedic Surgery and Research
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