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https://www.readbyqxmd.com/read/29148878/molecular-characterization-of-fluoroquinolone-resistance-mechanisms-of-campylobacter-isolates-from-duck-meats
#1
Min Kang, Bai Wei, Sung-Woon Choi, Se-Yeoun Cha, Hyung-Kwan Jang
The purpose of this study was to identify the molecular basis of quinolone resistance of Campylobacter isolates recovered from duck meats. Sixty-one isolates from duck meat samples were studied using sequence analysis of the gyrA gene, and PCR assays were used to identify the presence of the CmeABC efflux pump and its restored sensitivity in the presence of efflux-pump inhibitors. High-level resistance to nalidixic acid and ciprofloxacin was attributed to amino acid substitutions Thr-86-Ile in some isolates...
November 17, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29148165/dinitroaniline-herbicide-resistance-in-a-multiple-resistant-lolium-rigidum-population
#2
Jinyi Chen, Qin Yu, Mechelle Owen, Heping Han, Stephen Powles
BACKGROUND: The pre-emergence dinitroaniline herbicides (such as trifluralin and pendimethalin) are vital to Australian no-till farming systems. A Lolium rigidum population collected from the Western Australian grain belt with a 12-year trifluralin use history was characterised for resistance to dinitroaniline, acetyl CoA carboxylase (ACCase)- and acetolactate synthase (ALS)-inhibiting herbicides. Target-site resistance mechanisms were investigated. RESULTS: This L...
November 16, 2017: Pest Management Science
https://www.readbyqxmd.com/read/29141657/local-estrogen-axis-in-the-human-bone-microenvironment-regulates-estrogen%C3%A2-receptor-positive%C3%A2-breast-cancer-cells
#3
Derek F Amanatullah, John S Tamaresis, Pauline Chu, Michael H Bachmann, Nhat M Hoang, Deborah Collyar, Aaron T Mayer, Robert B West, William J Maloney, Christopher H Contag, Bonnie L King
BACKGROUND: Approximately 70% of all breast cancers express the estrogen receptor, and are regulated by estrogen. While the ovaries are the primary source of estrogen in premenopausal women, most breast cancer is diagnosed following menopause, when systemic levels of this hormone decline. Estrogen production from androgen precursors is catalyzed by the aromatase enzyme. Although aromatase expression and local estrogen production in breast adipose tissue have been implicated in the development of primary breast cancer, the source of estrogen involved in the regulation of estrogen receptor-positive (ER+) metastatic breast cancer progression is less clear...
November 15, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29140683/nanocomposite-phosphor-consisting-of-cai2-eu-2-single-nanocrystals-embedded-in-crystalline-sio2
#4
Hisayoshi Daicho, Takeshi Iwasaki, Yu Shinomiya, Akitoshi Nakano, Hiroshi Sawa, Wataru Yamada, Satoru Matsuishi, Hideo Hosono
High luminescence efficiency is obtained in halide- and chalcogenide-based phosphors, but they are impractical because of their poor chemical durability. Here we report a halide-based nanocomposite phosphor with excellent luminescence efficiency and sufficient durability for practical use. Our approach was to disperse luminescent single nanocrystals of CaI2:Eu(2+) in a chemically stable, translucent crystalline SiO2 matrix. Using this approach, we successfully prepared a nanocomposite phosphor by means of self-organization through a simple solid-state reaction...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29138086/eugenol-derivatives-prospectively-inhibit-l-asparaginase-a-heady-target-protein-of%C3%A2-salmonella-typhimurium
#5
Archana Vimal, Anubhuti Jha, Awanish Kumar
Salmonella typhimurium is the causative agent of severe human infections and mortality throughout the world. Pacing advent of new resistance mechanisms in this microorganism exists, rendering treatment of infectious disease difficult. Ciprofloxacin is no longer considered the first choice of antimicrobial agent due to the emergence of resistance. Therefore, the need for scenario is to find out novel drug target and its potential inhibitor to fight against this pathogen. The present study was undertaken to find out a novel drug target and its inhibitor for improving the current therapeutic methods for treating Salmonella infections...
November 11, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29137494/trh-receptor-mobility-in-the-plasma-membrane-is-strongly-affected-by-agonist-binding-and-by-interaction-with-some-cognate-signaling-proteins
#6
Radka Moravcova, Barbora Melkes, Jiri Novotny
OBJECTIVES: Extensive research has been dedicated to elucidating the mechanisms of signal transduction through different G protein-coupled receptors (GPCRs). However, relatively little is known about the regulation of receptor movement within the cell membrane upon ligand binding. In this study we focused our attention on the thyrotropin-releasing hormone (TRH) receptor that typically couples to Gq/11 proteins. METHODS: We monitored receptor diffusion in the plasma membrane of HEK293 cells stably expressing yellow fluorescent protein (YFP)-tagged TRH receptor (TRHR-YFP) by fluorescence recovery after photobleaching (FRAP)...
November 14, 2017: Journal of Receptor and Signal Transduction Research
https://www.readbyqxmd.com/read/29133527/interaction-of-the-phosphorylated-dna-binding-domain-in-nuclear-receptor-car-with-its-ligand-binding-domain-regulates-car-activation
#7
Ryota Shizu, Jungki Min, Mack Sobhany, Lars C Pedersen, Shingo Mutoh, Masahiko Negishi
The nuclear protein constitutive active/androstane receptor (CAR or NR1I3) regulates several liver functions such as drug and energy metabolism and cell growth or death, which are often involved in the development of diseases such as diabetes and hepatocellular carcinoma. CAR undergoes a conversion from inactive homodimers to active heterodimers with retinoid X receptor alpha (RXRα), and phosphorylation of the DNA-binding domain (DBD) at Thr-38 in CAR regulates this conversion. Here, we uncovered the molecular mechanism by which this phosphorylation regulates the intramolecular interaction between CARs DBD and ligand-binding domain (LBD), enabling the homodimer-heterodimer conversion...
November 13, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29133469/an-invisible-ubiquitin-conformation-is-required-for-efficient-phosphorylation-by-pink1
#8
Christina Gladkova, Alexander F Schubert, Jane L Wagstaff, Jonathan N Pruneda, Stefan M V Freund, David Komander
The Ser/Thr protein kinase PINK1 phosphorylates the well-folded, globular protein ubiquitin (Ub) at a relatively protected site, Ser65. We previously showed that Ser65 phosphorylation results in a conformational change in which Ub adopts a dynamic equilibrium between the known, common Ub conformation and a distinct, second conformation wherein the last β-strand is retracted to extend the Ser65 loop and shorten the C-terminal tail. We show using chemical exchange saturation transfer (CEST) nuclear magnetic resonance experiments that a similar, C-terminally retracted (Ub-CR) conformation also exists at low population in wild-type Ub...
November 13, 2017: EMBO Journal
https://www.readbyqxmd.com/read/29130500/purification-characterization-and-application-of-a-novel-antimicrobial-peptide-from-andrias-davidianus-blood
#9
Jinjin Pei, Zhenzhen Feng, Ting Ren, Haiyan Sun, Hao Han, Wengang Jin, Jun Dang
The Andrias davidianus has been known as a traditional Chinese medicine for a long time. Its blood is considered as a waste or by-product of the meat production industry. Although there are reports on isolation of the antimicrobial peptides from different resources, there are no reports of their isolation from Andrias davidianus blood. In this work, an antimicrobial peptide, andricin B, was isolated from the blood of Andrias davidianus by an innovative method in which the magnetic liposome adsorption was combined with reversed-phase high performance liquid chromatography...
November 11, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29129694/mitochondrial-trna-thr-15909a-g-mutation-associated-with-hypertension-in-a-chinese-han-pedigree
#10
Haiying Li, Junwei Geng, Han Yu, Xiaowen Tang, Xiangjun Yang, Ling Xue
Mitochondrial DNA mutations are one of the molecular genetic bases of hypertension. Here, we performed clinical, genetic and mutational evaluation, molecular characterization as well as biochemical analysis of a Chinese Han family with maternally inherited hypertension. The m.15909A > G variant in tRNA(Thr) was identified. This mutation abolished a highly conserved base pairing (11U-24A) in the D-stem of tRNA(Thr) and affected the structure and function of mitochondrial tRNA(Thr). As a result, the overall levels of mitochondrial translation products was decreased...
November 9, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29128215/meta-analysis-to-predict-the-effects-of-metabolizable-amino-acids-on-dairy-cattle-performance
#11
I J Lean, M B de Ondarza, C J Sniffen, J E P Santos, K E Griswold
Meta-analytic methods were used to determine statistical relationships between metabolizable AA supplies and milk protein yield, milk protein percentage, and milk yield in lactating dairy cows. Sixty-three research publications (258 treatment means) were identified through a search of published literature using 3 search engines and met the criteria for inclusion in this meta-analysis. The Cornell Net Carbohydrate and Protein System (CNCPS) version 6.5 was used to determine dietary nutrient parameters including metabolizable AA...
November 8, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29127012/dystonia-4-dyt4-associated-tubb4a-mutants-exhibit-disorganized-microtubule-networks-and-inhibit-neuronal-process-growth
#12
Natsumi Watanabe, Misa Itakaoka, Yoich Seki, Takako Morimoto, Keiichi Homma, Yuki Miyamoto, Junji Yamauchi
Dystonia-1 (DYT1) is an autosomal dominant early-onset torsion form of dystonia, a neurological disease affecting movement. DYT1 is the prototypic hereditary dystonia and is caused by the mutation of the tor1a gene. The gene product has chaperone functions important for the control of protein folding and stability. Dystonia-4 (DYT4) is another autosomal dominant dystonia that is characterized by onset in the second to third decade of progressive laryngeal dysphonia. DYT4 is associated with the mutation of the tubb4a gene, although it remains to be understood how disease-associated mutation affects biochemical as well as cell biological properties of the gene product as the microtubule component (a tubulin beta subunit)...
November 7, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29125030/exploring-the-effect-of-d61g-mutation-on-shp2-cause-gain-of-function-activity-by-a-molecular-dynamics-study
#13
Hong-Lian Li, Ying Ma, Chang-Jie Zheng, Wen-Yan Jin, Wen-Shan Liu, Run-Ling Wang
Noonan syndrome (NS) is a common autosomal dominant congenital disorder which could cause the congenital cardiopathy and cancer predisposition. Previous studies reported that the knock-in mouse models of the mutant D61G of SHP2 exhibited the major features of NS, which demonstrated that the mutation D61G of SHP2 could cause NS. To explore the effect of D61G mutation on SHP2 and explain the high activity of the mutant, molecular dynamic (MD) simulations were performed on wild type (WT) of SHP2 and the mutated SHP2-D61G, respectively...
November 10, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29121398/protein-phosphatase-2a-and-tau-an-orchestrated-pas-de-deux
#14
REVIEW
Goce Taleski, Estelle Sontag
The neuronal microtubule-associated protein tau serves a critical role in regulating axonal microtubule dynamics to support neuronal and synaptic functions. Furthermore, it contributes to glutamatergic regulation and synaptic plasticity. Emerging evidence also suggests that tau serves as a signaling scaffold. Tau function and subcellular localisation are tightly regulated, in part, by the orchestrated interplay between phosphorylation and dephosphorylation events. Significantly, protein phosphatase type 2A (PP2A), encompassing the regulatory PPP2R2A (or Bα) subunit, is a major brain heterotrimeric enzyme and the primary tau Ser/Thr phosphatase in vivo...
November 9, 2017: FEBS Letters
https://www.readbyqxmd.com/read/29116036/bifidobacterium-callitrichidarum-sp-nov-from-the-faeces-of-the-emperor-tamarin-saguinus-imperator
#15
Monica Modesto, Samanta Michelini, Maria Cristina Sansosti, Carlotta De Filippo, Duccio Cavalieri, Linnea Qvirist, Thomas Andlid, Caterina Spiezio, Camillo Sandri, Stefano Pascarelli, Barbara Sgorbati, Paola Mattarelli
Three Gram-stain-positive, non-spore-forming, microaerophilic and fructose-6-phosphate phosphoketolase positive strains were isolated from a faecal sample of an adult subject of the emperor tamarin (Saguinus imperator). Given that the isolates revealed identical BOX PCR profiles, strain TRI 5(T) was selected as a representative and characterized further. Comparative analysis of 16S rRNA gene sequence similarity revealed that strain TRI 5(T) was closely related to Bifidobacterium saguini DSM 23967(T) (96.4 %) and to Bifidobacterium longum subsp...
November 8, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29115461/histone-deacetylase-inhibition-of-cardiac-autophagy-in-rats-on-a-high%C3%A2-fat-diet-with-low%C3%A2-dose-streptozotocin-induced-type-2-diabetes-mellitus
#16
Ting-I Lee, Kuan-Jen Bai, Yao-Chang Chen, Ting-Wei Lee, Cheng-Chih Chung, Wen-Chih Tsai, Shin-Yi Tsao, Yu-Hsun Kao
Autophagy serves a role in preserving cellular homeostasis. Diabetes mellitus (DM) impairs cardiac autophagy and is associated with an accumulation of cytotoxic proteins that may provoke apoptosis and damage cardiomyocytes. Histone deacetylase (HDAC) inhibitors attenuate cardiac fibrosis and inflammation, and improve cardiomyopathy resulting from DM. However, the effect of HDAC inhibition on autophagy in DM cardiomyopathy has not been investigated. The purpose of the present study was to evaluate whether HDAC inhibition modulates cardiac autophagy and to investigate the potential mechanisms in type 2 DM (T2DM) hearts...
October 26, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29113916/temperature-induced-variation-in-gene-expression-of-thyroid-hormone-receptors-and-deiodinases-of-european-eel-anguilla-anguilla-larvae
#17
S N Politis, A Servili, D Mazurais, J-L Zambonino-Infante, J J Miest, J Tomkiewicz, I A E Butts
Thyroid hormones (THs) are key regulators of growth, development, and metabolism in vertebrates and influence early life development of fish. TH is produced in the thyroid gland (or thyroid follicles) mainly as T4 (thyroxine), which is metabolized to T3 (3,5,3'-triiodothyronine) and T2 (3,5-diiodothyronine) by deiodinase (DIO) enzymes in peripheral tissues. The action of these hormones is mostly exerted by binding to a specific nuclear thyroid hormone receptor (THR). In this study, we i) cloned and characterized thr sequences, ii) investigated the expression pattern of the different subtypes of thrs and dios, and iii) studied how temperature affects the expression of those genes in artificially produced early life history stages of European eel (Anguilla anguilla), reared in different thermal regimes (16, 18, 20 and 22°C) from hatch until first-feeding...
November 4, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29112820/daedophamide-a-cytotoxic-cyclodepsipeptide-from-a-daedalopelta-sp-sponge-collected-in-indonesia
#18
Carlos Urda, Rogelio Fernández, Jaime Rodríguez, Marta Pérez, Carlos Jiménez, Carmen Cuevas
A new cyclodepsipeptide, daedophamide (1), has been isolated from a Daedalopelta sp. marine sponge collected from Alor Island (Indonesia). The planar structure of 1 was assigned on the basis of extensive 1D and 2D NMR spectroscopy and mass spectrometry. Daedophamide (1) contains 11 amino acid residues and an amide-linked 3-hydroxy-2,4,6,8-tetramethylnonanoic acid (Htemna). The amino acid constituents were identified as l-Leu, N-Me-l-Gln, d-Arg, d-Asp, d-allo-Thr, l-Pip, d-Ala, d-Ser, 3,4-dimethyl-Gln, O-MeThr, and 4-amino-7-guanidino-2,3-dihydroxyheptanoic acid (Agdha)...
November 7, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/29111557/a-novel-perovskite-solar-cell-design-using-aligned-tio2-nano-bundles-grown-on-a-sputtered-ti-layer-and-a-benzothiadiazole-based-dopant-free-hole-transporting-material
#19
Sadia Ameen, M Nazim, M Shaheer Akhtar, Mohammad Khaja Nazeeruddin, Hyung-Shik Shin
This work highlights the utilization of a novel hole-transporting material (HTM) derived from benzothiadiazole: 4-(3,5-bis(trifluoromethyl)phenyl)-7-(5'-hexyl-[2,2'-bithiophen]-5-yl)benzo[c][1,2,5]thiadiazole (CF-BTz-ThR) and aligned TiO2 nano-bundles (TiO2 NBs) as the electron transporting layer (ETL) for perovskite solar cells (PSCs). The aligned TiO2 NBs were grown on titanium (Ti)-coated FTO substrates using a facile hydrothermal method. The newly designed CF-BTz-ThR molecule with suitable highest occupied molecular orbital (HOMO) favored the effective hole injection from perovskite deposited aligned TiO2 NBs thin film...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29110415/structural-and-functional-studies-of-differentially-o-glycosylated-analogs-of-a-thrombin-inhibitory-peptide-variegin
#20
Pidathala R V Shabareesh, Ashish Kumar, Dinakar M Salunke, Kanwal J Kaur
Variegin is a 32-amino acid long thrombin inhibitory peptide isolated from the salivary gland extract of tropical bont tick Amblyomma variegatum. It was identified to be O-glycosylated on its Thr-14 side chain, and this glycosylated form was 14-fold more potent than that of its non-glycosylated form. However, as the identity of this glycosylation remained elusive, the mechanistic details underlying its functional impact are not yet known. In this report, we synthesized four different O-glycosylated analogs of variegin bearing physiologically relevant sugars on its Thr-14...
November 7, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
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