Read by QxMD icon Read

structural insight

Kai Wang, Xiaoguang Xu, Liying Lu, Haicheng Wang, Yan Li, Yong Wu, Jun Miao, Jin Z Zhang, Yong Jiang
Ag/Bi2 Fe4 O9 nanoparticles (BFO NPs) have been synthesized using a two step approach involving glycine combustion and visible light irradiation. Their structures were characterized in detail using XRD, TEM, SEM, and STEM techniques. Their electrocatalytic properties were studied through enzymatic glucose detection with an amperometric biosensor. The Ag deposited on selective crystal facets of BFO NPs significantly enhanced their electrocatalytic activity. To gain insight into the origin of the enhanced electrocatalytic activities, we have carried out studies of Ag+ reduction and Mn2+ oxidation reaction at {200} and {001} facets, respectively...
March 22, 2018: ACS Applied Materials & Interfaces
Luan Carvalho Martins, Pedro Henrique Monteiro Torres, Renata Barbosa de Oliveira, Pedro Geraldo Pascutti, Elio A Cino, Rafaela Salgado Ferreira
Chagas disease remains a major health problem in South America, and throughout the world. The two drugs clinically available for its treatment have limited efficacy and cause serious adverse effects. Cruzain is an established therapeutic target of Trypanosoma cruzi, the protozoan that causes Chagas disease. Our group recently identified a competitive cruzain inhibitor (compound 1) with an IC50  = 15 µM that is also more synthetically accessible than the previously reported lead, compound 2. Prior studies, however, did not propose a binding mode for compound 1, hindering understanding of the structure-activity relationship and optimization...
March 21, 2018: Journal of Computer-aided Molecular Design
J J Brugts, G C M Linssen, A W Hoes, H P Brunner-La Rocca
AIMS: Data from patient registries give insight into the management of patients with heart failure (HF), but actual data from unselected real-world HF patients are scarce. Therefore, we performed a cross sectional study of current HF care in the period 2013-2016 among more than 10,000 unselected HF patients at HF outpatient clinics in the Netherlands. METHODS: In 34 participating centres, all 10,910 patients with chronic HF treated at cardiology centres were included in the CHECK-HF registry...
March 21, 2018: Netherlands Heart Journal
Ding Li, Jianbo Wang
The mammalian heart is the first organ to form and is critical for embryonic survival and development. With an occurrence of 1%, congenital heart defects (CHDs) are also the most common birth defects in humans, and major cause of childhood morbidity and mortality (Hoffman and Kaplan in J Am Coll Cardiol 39(12):1890-1900, 2002; Samanek in Cardiol Young 10(3):179-185, 2000). Understanding how the heart forms will not only help to determine the etiology and to design diagnostic and therapeutic approaches for CHDs, but may also provide insight into regenerative medicine to repair injured adult hearts...
March 22, 2018: Pediatric Cardiology
Troy J Rand, Mukul Mukherjee
The sensorimotor system prefers sway velocity information when maintaining upright posture. Sway velocity has a unique characteristic of being persistent on a short time-scale and anti-persistent on a longer time-scale. The time where the transition from persistence to anti-persistence occurs provides information about how sway velocity is controlled. It is, however, not clear what factors affect shifts in this transition point. This research investigated postural responses to support surface movements of different temporal correlations and movement velocities...
March 21, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Emma Langella, Martina Buonanno, Daniela Vullo, Nina Dathan, Marilisa Leone, Claudiu T Supuran, Giuseppina De Simone, Simona Maria Monti
Human carbonic anhydrase IX (hCA IX) is a tumour-associated enzyme present in a limited number of normal tissues, but overexpressed in several malignant human tumours. It is a transmembrane protein, where the extracellular region consists of a greatly investigated catalytic CA domain and a much less investigated proteoglycan-like (PG) domain. Considering its important role in tumour biology, here, we report for the first time the full characterization of the PG domain, providing insights into its structural and functional features...
March 21, 2018: Cellular and Molecular Life Sciences: CMLS
Matthew Chojnacki, Lori K Fenton
The Mars Science Laboratory rover Curiosity engaged in a monthlong campaign investigating the Bagnold dune field in Gale crater. What represents the first in situ investigation of a dune field on another planet has resulted in a number of discoveries. Collectively, the Curiosity rover team has compiled the most comprehensive survey of any extraterrestrial aeolian system visited to date with results that yield important insights into a number of processes, including sediment transport, bed form morphology and structure, chemical and physical composition of aeolian sand, and wind regime characteristics...
November 2017: Journal of Geophysical Research. Planets
Aparajita Banerjee, Björn Hamberger
Catalyzing stereo- and regio-specific oxidation of inert hydrocarbon backbones, and a range of more exotic reactions inherently difficult in formal chemical synthesis, cytochromes P450 (P450s) offer outstanding potential for biotechnological engineering. Plants and their dazzling diversity of specialized metabolites have emerged as rich repository for functional P450s with the advances of deep transcriptomics and genome wide discovery. P450s are of outstanding interest for understanding chemical diversification throughout evolution, for gaining mechanistic insights through the study of their structure-function relationship, and for exploitation in Synthetic Biology...
2018: Phytochemistry Reviews: Proceedings of the Phytochemical Society of Europe
Ryan M Weatherwax, Nigel K Harris, Andrew E Kilding, Lance C Dalleck
Background: Even though cardiorespiratory fitness (CRF) training elicits numerous health benefits, not all individuals have positive training responses following a structured CRF intervention. It has been suggested that the technical error (TE), a combination of biological variability and measurement error, should be used to establish specific training responsiveness criteria to gain further insight on the effectiveness of the training program. To date, most training interventions use an absolute change or a TE from previous findings, which do not take into consideration the training site and equipment used to establish training outcomes or the specific cohort being evaluated...
2018: Open Access Journal of Sports Medicine
Reafa A Hossain, Nicholas R Dunham, Raymond A Enke, Christopher E Berndsen
Purpose: DNA methylation is a well-characterized epigenetic repressor of mRNA transcription in many plant and vertebrate systems. However, the mechanism of this repression is not fully understood. The process of transcription is controlled by proteins that regulate recruitment and activity of RNA polymerase by binding to specific cis-regulatory sequences. Cone-rod homeobox (CRX) is a well-characterized mammalian transcription factor that controls photoreceptor cell-specific gene expression...
2018: Molecular Vision
Jin-Yu Yang, Xiang-Yu Deng, Yi-Sheng Li, Xian-Cai Ma, Jian-Xiong Feng, Bing Yu, Yang Chen, Yi-Ling Luo, Xi Wang, Mei-Ling Chen, Zhi-Xin Fang, Fu-Xiang Zheng, Yi-Ping Li, Qian Zhong, Tie-Bang Kang, Li-Bing Song, Rui-Hua Xu, Mu-Sheng Zeng, Wei Chen, Hui Zhang, Wei Xie, Song Gao
Cleavage of transfer (t)RNA and ribosomal (r)RNA are critical and conserved steps of translational control for cells to overcome varied environmental stresses. However, enzymes that are responsible for this event have not been fully identified in high eukaryotes. Here, we report a mammalian tRNA/rRNA-targeting endoribonuclease: SLFN13, a member of the Schlafen family. Structural study reveals a unique pseudo-dimeric U-pillow-shaped architecture of the SLFN13 N'-domain that may clamp base-paired RNAs. SLFN13 is able to digest tRNAs and rRNAs in vitro, and the endonucleolytic cleavage dissevers 11 nucleotides from the 3'-terminus of tRNA at the acceptor stem...
March 21, 2018: Nature Communications
Jason X Cheng, Li Chen, Yuan Li, Adam Cloe, Ming Yue, Jiangbo Wei, Kenneth A Watanabe, Jamile M Shammo, John Anastasi, Qingxi J Shen, Richard A Larson, Chuan He, Michelle M Le Beau, James W Vardiman
The roles of RNA 5-methylcytosine (RNA:m5 C) and RNA:m5 C methyltransferases (RCMTs) in lineage-associated chromatin organization and drug response/resistance are unclear. Here we demonstrate that the RCMTs, namely NSUN3 and DNMT2, directly bind hnRNPK, a conserved RNA-binding protein. hnRNPK interacts with the lineage-determining transcription factors (TFs), GATA1 and SPI1/PU.1, and with CDK9/P-TEFb to recruit RNA-polymerase-II at nascent RNA, leading to formation of 5-Azacitidine (5-AZA)-sensitive chromatin structure...
March 21, 2018: Nature Communications
Thomas R Aunins, Katherine A Marsh, Gitanjali Subramanya, Susan L Uprichard, Alan S Perelson, Anushree Chatterjee
Hepatitis C virus infection is a global health problem, with nearly 2 million new infections occurring every year and up to 85% of these becoming chronic infections that pose serious long-term health risks. To effectively reduce the prevalence of HCV infection and associated diseases, it is important to understand the intracellular dynamics of the viral lifecycle. Here, we present a detailed mathematical model that represents the full hepatitis C lifecycle. It is the first full HCV model to be fit to acute intracellular infection data and the first to explore the functions of distinct viral proteins, probing multiple hypotheses of cis - and trans -acting mechanisms to provide insights for drug targeting...
March 21, 2018: Journal of Virology
Turgay Kilic, Anna Koromyslova, Virginie Malak, Grant S Hansman
Human noroviruses are the leading cause of acute gastroenteritis in human. Noroviruses also infect animals such as cow, mice, cat, and dog. How noroviruses bind and enter host cells is still incompletely understood. Recently, the type I transmembrane protein CD300lf was recently identified as the murine norovirus receptor, yet it is unclear how the virus capsid and receptor interact at the molecular level. In this study, we determined the X-ray crystal structure of the soluble CD300lf (sCD300lf) and murine norovirus capsid-protruding domain complex at 2...
March 21, 2018: Journal of Virology
Heng Zhang, Bo Zhou, Su Qin, Jing Xu, Rachel Harding, Wolfram Tempel, Vinod Nayak, Yanjun Li, Peter Loppnau, Yali Dou, Jinrong Min
The mixed-lineage leukemia (MLL)-AF10 fusion oncoprotein recruits DOT1L to the homeobox A ( HOXA ) gene cluster through the octapeptide motif leucine zipper (OM-LZ), thereby inducing and maintaining the MLL-AF10-associated leukemogenesis. However, the recognition mechanism between DOT1L and MLL-AF10 is unclear. Here, we present the crystal structures of both apo AF10OM-LZ and its complex with the coiled-coil domain of DOT1L. Disruption of the DOT1L-AF10 interface abrogates MLL-AF10-associated leukemic transformation...
March 21, 2018: Genes & Development
Yi Ding, Le Liu, Yaowei Fang, Xu Zhang, Mingsheng Lyu, Shujun Wang
We report the adsorption of dextranase on a Mg/Fe-layered double hydroxide (Mg/Fe-LDH). We focused the effects of different buffers, pH, and amino acids. The Mg/Fe-LDH was synthesized, and adsorption experiments were performed to investigate the effects. The maximum adsorption occurred in pH 7.0 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) buffer, and the maximum dextranase adsorption uptake was 1.38 mg/g (416.67 U/mg); histidine and phenylalanine could affect the adsorption. A histidine tag could be added to the protein to increase the adsorption significantly...
March 19, 2018: Nanomaterials
Arthur Aronson
The spore coat of Bacilli is a relatively complex structure comprised of about 70 species of proteins in 2 or 3 layers. While some are involved in assembly or protection, the regulation of many are not well defined so lacZ transcriptional fusions were constructed to six Bacillus anthracis spore coat genes in order to gain insight into their possible functions. The genes were selected on the basis of the location of the encoded proteins within the coat and distribution among spore forming species. Conditions tested were temperature and media either as solid or liquid...
March 17, 2018: FEMS Microbiology Letters
Ji She, Jiangtao Guo, Qingfeng Chen, Weizhong Zeng, Youxing Jiang, Xiao-Chen Bai
The organellar two-pore channel (TPC) functions as a homodimer, in which each subunit contains two homologous Shaker-like six-transmembrane (6-TM)-domain repeats. TPCs belong to the voltage-gated ion channel superfamily and are ubiquitously expressed in animals and plants. Mammalian TPC1 and TPC2 are localized at the endolysosomal membrane, and have critical roles in regulating the physiological functions of these acidic organelles. Here we present electron cryo-microscopy structures of mouse TPC1 (MmTPC1)-a voltage-dependent, phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2 )-activated Na+ -selective channel-in both the apo closed state and ligand-bound open state...
March 21, 2018: Nature
Neha Maurya, Mehraj Ud Din Parray, Jitendra Kumar Maurya, Amit Kumar, Rajan Patel
The binding nature of amphiphilic drugs viz. promethazine hydrochloride (PMT) and adiphenine hydrochloride (ADP), with human hemoglobin (Hb) was unraveled by fluorescence, absorbance, time resolved fluorescence, fluorescence resonance energy transfer (FRET) and circular dichroism (CD) spectral techniques in combination with molecular docking and molecular dynamic simulation methods. The steady state fluorescence spectra indicated that both PMT and ADP quenches the fluorescence of Hb through static quenching mechanism which was further confirmed by time resolved fluorescence spectra...
March 11, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Agnieszka Drozd, Dominika Wojewska, Manuel David Peris-Díaz, Piotr Jakimowicz, Artur Krężel
Metallothioneins (MTs), small cysteine-rich proteins, present in four major isoforms, are key proteins involved in zinc and copper homeostasis in mammals. To date, only one X-ray crystal structure of a MT has been solved. It demonstrates seven bivalent metal ions bound in two structurally independent domains with M4S11 (α) and M3S9 (β) clusters. Recent discoveries indicate that Zn(ii) ions are bound with MT2 with the range from nano- to picomolar affinity, which determines its cellular zinc buffering properties that are demonstrated by the presence of partially Zn(ii)-depleted MT2 species...
March 21, 2018: Metallomics: Integrated Biometal Science
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"