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https://www.readbyqxmd.com/read/28345895/asymmetric-anchoring-is-required-for-efficient-%C3%AE-loop-opening-and-closing-in-cytosolic-phosphoenolpyruvate-carboxykinase
#1
Danica Cui, Aron Broom, Matthew J Mcleod, Elizabeth M Meiering, Todd Holyoak
Mobile Ω-loops play essential roles in the function of many enzymes. Here we investigated the importance of a residue lying outside of the mobile Ω-loop element in the catalytic function of an H477R variant of cPEPCK using crystallographic, kinetic, and computational analysis. The crystallographic data suggest that efficient transitioning of the Ω-loop to the closed conformation requires stabilization of the N-terminus of the loop through contacts between R461 and E588. In contrast, the C-terminal end of the Ω-loop undergoes changing interactions with the enzyme body through contacts between H477 at the C-terminus of the loop and E591 located on the enzyme body...
March 27, 2017: Biochemistry
https://www.readbyqxmd.com/read/28336770/ptac10-a-key-subunit-of-plastid-encoded-rna-polymerase-promotes-chloroplast-development
#2
Sun Hyun Chang, Sangyool Lee, Tae Young Um, Ju-Kon Kim, Yang Do Choi, Geupil Jang
Regulation of photosynthetic gene expression by plastid-encoded RNA polymerase (PEP) is essential for chloroplast development. The activity of PEP largely relies on at least 12 PEP-associated proteins (PAPs) encoded in the nuclear genome of plant cells. A recent model proposed that these PAPs regulate the establishment of the PEP complex through broad PAP-PEP or PAP-PAP interactions. In this study, we identified the Arabidopsis thaliana seedling lethal mutant ptac10-1, which has defects in chloroplast development, and found that the mutant phenotype is caused by the suppression of PLASTID S1 RNA-BINDING DOMAIN PROTEIN (pTAC10/PAP3)...
March 23, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28333929/the-rise-and-fall-of-rabies-in-japan-a-quantitative-history-of-rabies-epidemics-in-osaka-prefecture-1914-1933
#3
Aiko Kurosawa, Kageaki Tojinbara, Hazumu Kadowaki, Katie Hampson, Akio Yamada, Kohei Makita
Japan has been free from rabies since the 1950s. However, during the early 1900s several large-scale epidemics spread throughout the country. Here we investigate the dynamics of these epidemics between 1914 and 1933 in Osaka Prefecture, using archival data including newspapers. The association between dog rabies cases and human population density was investigated using Mixed-effects models and epidemiological parameters such as the basic reproduction number (R0), the incubation and infectious period and the serial interval were estimated...
March 23, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28332010/an-evidence-based-walking-program-among-older-people-with-knee-osteoarthritis-the-pep-participant-exercise-preference-pilot-randomized-controlled-trial
#4
Laurianne Loew, Lucie Brosseau, Glen P Kenny, Natalie Durand-Bush, Stéphane Poitras, Gino De Angelis, George A Wells
Knee osteoarthritis is a common joint problem leading to an increase of pain and a loss of function in older individuals. The main objective of this study was to evaluate if a participant who was randomly assigned to his preferred group improved his adherence to an effective walking program compared to a participant who did not receive his preferred group. This was a 9-month pilot randomized clinical trial, based on a patient treatment preferences design. The 69 eligible participants had a diagnosis of knee osteoarthritis...
March 22, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28321400/toward-elimination-of-dog-mediated-human-rabies-experiences-from-implementing-a-large-scale-demonstration-project-in-southern-tanzania
#5
Emmanuel Abraham Mpolya, Tiziana Lembo, Kennedy Lushasi, Rebecca Mancy, Eberhard M Mbunda, Selemani Makungu, Matthew Maziku, Lwitiko Sikana, Gurdeep Jaswant, Sunny Townsend, François-Xavier Meslin, Bernadette Abela-Ridder, Chanasa Ngeleja, Joel Changalucha, Zacharia Mtema, Maganga Sambo, Geofrey Mchau, Kristyna Rysava, Alphoncina Nanai, Rudovick Kazwala, Sarah Cleaveland, Katie Hampson
A Rabies Elimination Demonstration Project was implemented in Tanzania from 2010 through to 2015, bringing together government ministries from the health and veterinary sectors, the World Health Organization, and national and international research institutions. Detailed data on mass dog vaccination campaigns, bite exposures, use of post-exposure prophylaxis (PEP), and human rabies deaths were collected throughout the project duration and project areas. Despite no previous experience in dog vaccination within the project areas, district veterinary officers were able to implement district-wide vaccination campaigns that, for most part, progressively increased the numbers of dogs vaccinated with each phase of the project...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28321164/efficacy-and-safety-of-limited-endoscopic-sphincterotomy-before-self-expandable-metal-stent-insertion-for-malignant-biliary-obstruction
#6
Hyeong Seok Nam, Dae Hwan Kang, Hyung Wook Kim, Cheol Woong Choi, Su Bum Park, Su Jin Kim, Dae Gon Ryu
AIM: To evaluate the safety and efficacy of limited endoscopic sphincterotomy (ES) before placement of self-expandable metal stent (SEMS). METHODS: This was a retrospective analysis of 244 consecutive patients with unresectable malignant biliary obstruction, who underwent placement of SEMSs following limited ES from December 2008 to February 2015. The diagnosis of malignant biliary obstruction and assessment of patient eligibility for the study was established by a combination of clinical findings, laboratory investigations, imaging and pathological results...
March 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28318148/barriers-to-innovation-in-human-rabies-prophylaxis-and-treatment-a-causal-analysis-of-insights-from-key-opinion-leaders-and-literature
#7
L H M van de Burgwal, A M G Neevel, C A C M Pittens, A D M E Osterhaus, C E Rupprecht, E Claassen
Rabies is an essentially 100% fatal, zoonotic disease, caused by Lyssaviruses. Currently, the disease is vaccine-preventable with pre- and post-exposure prophylaxis (PrEP and PEP). Still, rabies virus is estimated to cause up to 60,000 human deaths annually, of which the vast majority occurs in rural Asia and Africa, due to the inaccessibility of prophylaxis and non-existence of treatment. Despite these unmet clinical needs, rabies control mainly focuses on the sylvatic reservoir and drug innovation receives relatively little attention compared to other neglected tropical diseases (NTDs)...
March 20, 2017: Zoonoses and Public Health
https://www.readbyqxmd.com/read/28317742/determination-of-hymexazol-in-26-foods-of-plant-origin-by-modified-quechers-method-and-liquid-chromatography-tandem-mass-spectrometry
#8
Zejun Jiang, Hui Li, Xiaolin Cao, Pengfei Du, Hua Shao, Fen Jin, Maojun Jin, Jing Wang
A rapid and sensitive method based on modified QuEChERS for hymexazol determination in 26 plant-derived foods using liquid chromatography tandem-mass spectrometry (LC-MS/MS) was developed. Variables affecting the separation (LC column, mobile phase additives) and clean-up effects of various dispersive phases, such as PSA, C18, GCB, MWCNTs, PEP-2, Al2O3, Florisil, and PVPP were evaluated. The method was validated using 26 matrices at spiked levels of 0.01 or 0.02, 0.05, 0.1, and 0.5mg/kg (0.05, 0.2, 0.5, and 1...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28315758/tat-pep-a-novel-blocker-of-pirb-enhances-the-recovery-of-cognitive-function-in-mice-after-transient-global-cerebral-ischemia
#9
Liya Li, Bin Deng, Shuang Li, Tao Jiang, Zhaoyang Xiao, Qiang Wang
Neuronal damage and axonal regeneration inhibition are the main reasons to poor functional recovery after ischemia. Nogo-A signals inhibit axon outgrowth through the PirB receptor after ischemic reperfusion injury in central nervous system. We use TAT-PEP, a novel protein which could pass through the blood brain barrier, to block the function of PirB and identify the long-term neurological and behavioral recovery after bilateral common carotid artery occlusion (BCCAO) in mice. We observed that TAT-PEP promoted neuron survival and inhibited neuronal apoptosis...
March 15, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28301480/management-and-modeling-approaches-for-controlling-raccoon-rabies-the-road-to-elimination
#10
REVIEW
Stacey A Elmore, Richard B Chipman, Dennis Slate, Kathryn P Huyvaert, Kurt C VerCauteren, Amy T Gilbert
Rabies is an ancient viral disease that significantly impacts human and animal health throughout the world. In the developing parts of the world, dog bites represent the highest risk of rabies infection to people, livestock, and other animals. However, in North America, where several rabies virus variants currently circulate in wildlife, human contact with the raccoon rabies variant leads to the highest per capita population administration of post-exposure prophylaxis (PEP) annually. Previous rabies variant elimination in raccoons (Canada), foxes (Europe), and dogs and coyotes (United States) demonstrates that elimination of the raccoon variant from the eastern US is feasible, given an understanding of rabies control costs and benefits and the availability of proper tools...
March 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28301425/dolutegravir-with-tenofovir-disoproxil-fumarate-emtricitabine-as-hiv-post-exposure-prophylaxis-in-gay-and-bisexual-men
#11
John Mcallister, Janet M Towns, Anna Mcnulty, Anna B Pierce, Rosalind Foster, Robyn Richardson, Andrew Carr
OBJECTIVES: Completion rates for HIV post-exposure prophylaxis (PEP) are often low. We investigated the adherence and safety of dolutegravir (DTG 50 mg daily) with tenofovir disoproxil fumarate 300 mg/emtricitabine 200 mg (TDF-FTC) as 3-drug PEP in gay and bisexual men (GBM). DESIGN: Open-label, single-arm study at 3 sexual health clinics and 2 emergency departments in Australia. METHODS: One hundred HIV-uninfected GBM requiring PEP received DTG plus TDF-FTC for 28 days...
March 15, 2017: AIDS
https://www.readbyqxmd.com/read/28299897/towards-canine-rabies-elimination-economic-comparisons-of-three-project-sites
#12
J L Elser, B G Hatch, L H Taylor, L H Nel, S A Shwiff
An appreciation of the costs of implementing canine rabies control in different settings is important for those planning new or expanded interventions. Here we compare the costs of three canine rabies control projects in South Africa, the Philippines and Tanzania to identify factors that influence the overall costs of rabies control efforts. There was considerable variation in the cost of vaccinating each dog, but across the sites these were lower where population density was higher, and later in the projects when dog vaccination coverage was increased...
March 15, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28299698/piezoelectric-plate-sensor-peps-for-analysis-of-specific-kras-point-mutations-at-low-copy-number-in-urine-without-dna-isolation-or-amplification
#13
Ceyhun E Kirimli, Wei-Heng Shih, Wan Y Shih
We have examined in situ detection of single-nucleotide KRAS mutations in urine using a (Pb(Mg1/3Nb2/3)O3)0.65(PbTiO3)0.35 (PMN-PT) piezoelectric plate sensor (PEPS) coated with a 17-nucleotide (nt) locked nucleic acid (LNA) probe DNA complementary to the KRAS mutation without DNA isolation and amplification. In situ mutant (MT) DNA in urine in a wild type (WT) background was carried out at a flow rate of 4 mL/min and at 63 °C with the PEPS vertically situated at the center of the flow. Both the temperature and the impingement flow force discriminated the wild type...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28298192/how-to-select-patients-and-timing-for-rectal-indomethacin-to-prevent-post-ercp-pancreatitis-a-systematic-review-and-meta-analysis
#14
REVIEW
Jianhua Wan, Yuping Ren, Zhenhua Zhu, Liang Xia, Nonghua Lu
BACKGROUND: Acute pancreatitis is a severe complication of endoscopic retrograde cholangiopancreatography (ERCP). Previous meta-analyses have shown that indomethacin effectively prevents this complication; however, the data are limited. We performed a systematic review and meta-analysis to clarify the applications for rectal indomethacin. METHODS: A systematic search was performed in June 2016. Human prospective, randomized, placebo-controlled trials that compared rectally administered indomethacin with a placebo for the prevention of post-ERCP pancreatitis (PEP) were included...
March 15, 2017: BMC Gastroenterology
https://www.readbyqxmd.com/read/28296145/synthesis-and-opioid-activity-of-tyr1-z-cf-ch-gly2-and-tyr1-s-r-cf3ch-nh-gly2-leu-enkephalin-fluorinated-pep-tidomimetics
#15
Somnath N Karad, Mohan Pal, Thomas E Prisinzano, Rachel Saylor Crowley, Ryan A Altman
We describe the design, synthesis, and opioid activity of fluoroalkene (Tyr1-ψ[(Z)CF=CH]-Gly2) and trifluoroethylamine (Tyr1-ψ[(S)/(R)-CF3CH-NH]-Gly2) analogs of the endogenous opioid neuropeptide, Leu-enkephalin. The fluoroalkene peptidomimetic exihibited low nanomolar functional activity (5.0 ± 2 nM and 60 ± 15 nM for δ- and μ-opioid receptors, respectively) with a μ/δ-selectivity ratio that mimicked the natural peptide. However, the trifluoroethyl-amine peptidomimetics, irrespective of stereochemistry, did not activate the opioid receptors, which suggest that bulky CF3 substitu-ents are not tolerated at this position...
March 14, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28293755/zinc-inhibition-of-pyruvate-kinase-of-m-type-isozyme
#16
Keiko Murakami, Masataka Yoshino
Inhibitory effect of Zn on the pyruvate kinase of M (muscle)-type isozyme was analyzed for the purpose of elucidating the cytotoxicity of Zn. Zn inhibited pyruvate kinase uncompetitively with respect to the substrate PEP, and competitively with respect to ADP. Quotient velocity plot calculated from the Zn-inhibition curves showed that Zn(2+) as a ZnADP complex acted as competitive and uncompetitive inhibitors of the enzyme with respect to the substrate ADP and PEP, respectively: Zn(2+) forms a ZnADP complex, which may bind to the ADP-binding site of the free enzyme with the Ki value of 1...
March 14, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28293426/identification-of-potential-serum-biomarkers-for-breast-cancer-using-a-functional-proteomics-technology
#17
David L Wang, Chuanguang Xiao, Guofeng Fu, Xing Wang, Liang Li
BACKGROUND: Cancer is a genetic disease; its development and metastasis depend on the function of many proteins. Human serum contains thousands of proteins; it is a window for the homeostasis of individual's health. Many of the proteins found in the human serum could be potential biomarkers for cancer early detection and drug efficacy evaluation. METHODS: In this study, a functional proteomics technology was used to systematically monitor metabolic enzyme and protease activities from resolved serum proteins produced by a modified 2-D gel separation and subsequent Protein Elution Plate, a method collectively called PEP...
2017: Biomarker Research
https://www.readbyqxmd.com/read/28293199/the-science-of-racing-against-opponents-affordance-competition-and-the-regulation-of-exercise-intensity-in-head-to-head-competition
#18
Florentina J Hettinga, Marco J Konings, Gert-Jan Pepping
Athlete-environment interactions are crucial factors in understanding the regulation of exercise intensity in head-to-head competitions. Previously, we have proposed a framework based on the interdependence of perception and action, which allows us to explore athletic behavior in the more complex pacing situations occurring when athletes need to respond to actions of their opponents. In the present perspective we will further explore whether opponents, crucial external factors in competitive sports, could indeed be perceived as social invitations for action...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28292973/evaluation-of-functional-characteristics-of-4-oscillatory-positive-pressure-devices-in-a-simulated-cystic-fibrosis-model
#19
Hillary Van Fleet, Diane K Dunn, Neil L McNinch, Teresa A Volsko
BACKGROUND: Oscillatory positive expiratory pressure (OPEP) is an airway clearance therapy that delivers positive pressure and air-flow oscillations during exhalation. This study described functional characteristic differences of 4 OPEP devices during an active exhalation in a simulated model. We hypothesized peak pressure (Ppeak), positive expiratory pressure (PEP), oscillatory frequency (f), and pressure amplitude will differ, depending upon the device used, device resistance setting, and time (repeated consecutive active exhalations through the device)...
March 14, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28292959/multiepitope-tissue-analysis-reveals-sppl3-mediated-adam10-activation-as-a-key-step-in-the-transformation-of-melanocytes
#20
Christian Ostalecki, Jung-Hyun Lee, Jochen Dindorf, Lena Collenburg, Stephan Schierer, Beate Simon, Stefan Schliep, Elisabeth Kremmer, Gerold Schuler, Andreas S Baur
The evolution of cancer is characterized by the appearance of specific mutations, but these mutations are translated into proteins that must cooperate to induce malignant transformation. Using a systemic approach with the multiepitope ligand cartography (MELC) technology, we analyzed protein expression profiles (PEPs) in nevi and BRAF(V600E)-positive superficial spreading melanomas (SSMs) from patient tissues to identify key transformation events. The PEPs in nevi and SSMs differed predominantly in the abundance of specific antigens, but the PEPs of nevi- and melanoma-associated keratinocytes gradually changed during the transformation process...
March 14, 2017: Science Signaling
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