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https://www.readbyqxmd.com/read/28731268/-13-c-metabolic-flux-profiling-of-pichia-pastoris-grown-in-aerobic-batch-cultures-on-glucose-revealed-high-relative-anabolic-use-of-tca-cycle-and-limited-incorporation-of-provided-precursors-of-branched-chain-amino-acids
#1
Meng Zhang, Xiao-Wei Yu, Yan Xu, Paula Jouhten, G V T Swapna, Ralf W Glaser, John F Hunt, Gaetano T Montelione, Hannu Maaheimo, Thomas Szyperski
Carbon metabolism of Crabtree negative yeast Pichia pastoris was profiled using (13) C NMR to delineate regulation during exponential growth and to study the import of two precursors for branched-chain amino acid biosynthesis, α-ketoisovalerate and α-ketobutyrate. Cells were grown in aerobic batch cultures containing (i) only glucose, (ii) glucose along with the precursors, or (iii) glucose and Val. The study provided the following new insights. First, (13) C flux ratio analyses of central metabolism reveal an unexpectedly high anaplerotic supply of the tricarboxylic acid cycle for a Crabtree negative yeast, and show that a substantial fraction of glucose catabolism proceeds through the pentose phosphate pathway...
July 21, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28723925/immunologic-response-to-vaccine-challenge-in-pregnant-ptpn22-r620w-carriers-and-non-carriers
#2
Shelly H Tien, Juliet N Crabtree, Heather L Gray, Erik J Peterson
OBJECTIVES: Influenza infection is a significant cause of respiratory morbidity among pregnant women. Seasonal influenza vaccination engages innate immune receptors to promote protective immunity. A coding polymorphism (R620W) in PTPN22 imparts elevated risk for human infection and autoimmune disease, predisposes to diminished innate immune responses, and associates with reduced immunization responses. We sought to quantify the effects of PTPN22-R620W on humoral and cell-mediated immune responses to the inactivated influenza vaccine among healthy pregnant women...
2017: PloS One
https://www.readbyqxmd.com/read/28722632/pilot-intervention-study-of-household-ventilation-and-fine-particulate-matter-concentrations-in-a-low-income-urban-area-dhaka-bangladesh
#3
Anne M Weaver, Shahana Parveen, Doli Goswami, Christina Crabtree-Ide, Carole Rudra, Jihnhee Yu, Lina Mu, Alicia M Fry, Iffat Sharmin, Stephen P Luby, Pavani K Ram
Fine particulate matter (PM2.5) is a risk factor for pneumonia; ventilation may be protective. We tested behavioral and structural ventilation interventions on indoor PM2.5 in Dhaka, Bangladesh. We recruited 59 good ventilation (window or door in ≥ 3 walls) and 29 poor ventilation (no window, one door) homes. We monitored baseline indoor and outdoor PM2.5 for 48 hours. We asked all participants to increase ventilation behavior, including opening windows and doors, and operating fans. Where permitted, we installed windows in nine poor ventilation homes, then repeated PM2...
May 30, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28708777/intraoperative-topical-antibiotics-for-infection-prophylaxis-in-pelvic-and-acetabular-surgery
#4
Matthew T Owen, Emily M Keener, Zane B Hyde, Reaves M Crabtree, Parke W Hudson, Russell L Griffin, Jason A Lowe
OBJECTIVES: Determine if topical vancomycin and tobramycin powder reduces the incidence of surgical site infection (SSI) following pelvic ring and acetabulum fracture surgery. DESIGN: Retrospective cohort study SETTING:: University of Alabama at Birmingham, Academic Level I Trauma Center PATIENTS/PARTICIPANTS:: 219 patients (140 meeting inclusion criteria) with pelvic and acetabular fractures who underwent open reduction and internal fixation (ORIF) from March 2012 to November 2013...
June 26, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28706277/dna-binding-drives-the-association-of-brg1-hbrm-bromodomains-with-nucleosomes
#5
Emma A Morrison, Julio C Sanchez, Jehnna L Ronan, Daniel P Farrell, Katayoun Varzavand, Jenna K Johnson, Brian X Gu, Gerald R Crabtree, Catherine A Musselman
BRG1 and BRM, central components of the BAF (mSWI/SNF) chromatin remodelling complex, are critical in chromatin structure regulation. Here, we show that the human BRM (hBRM) bromodomain (BRD) has moderate specificity for H3K14ac. Surprisingly, we also find that both BRG1 and hBRM BRDs have DNA-binding activity. We demonstrate that the BRDs associate with DNA through a surface basic patch and that the BRD and an adjacent AT-hook make multivalent contacts with DNA, leading to robust affinity and moderate specificity for AT-rich elements...
July 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/28697603/introduction-ch-activation
#6
Robert H Crabtree, Aiwen Lei
No abstract text is available yet for this article.
July 12, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28676506/peritoneal-dialysis-access-and-start-practices-that-affect-dialysate-leak-and-technique-failure-acts-of-commission-and-omission
#7
John H Crabtree, Raoul J Burchette
No abstract text is available yet for this article.
July 2017: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/28663370/short-term-starvation-is-a-strategy-to-unravel-the-cellular-capacity-of-oxidizing-specific-exogenous-endogenous-substrates-in-mitochondria
#8
Julianna Dias Zeidler, Lorena O Fernandes-Siqueira, Ana S Carvalho, Eduardo Cararo-Lopes, Matheus H S Dias, Luisa A Ketzer, Antonio Galina, Andrea T Da Poian
Mitochondrial oxidation of nutrients is tightly regulated in response to the cellular environment and changes in energy demands. In vitro studies evaluating the mitochondrial capacity of oxidizing different substrates are important for understanding metabolic shifts in physiological adaptations and pathological conditions, but may be influenced by the nutrients present in the culture medium or by the utilization of endogenous stores. One such influence is exemplified by the Crabtree effect (the glucose-mediated inhibition of mitochondrial respiration), as most in vitro experiments are performed in glucose-containing media...
June 29, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28648068/redox-activity-of-oxo-bridged-iridium-dimers-in-an-n-o-donor-environment-characterization-of-remarkably-stable-ir-iv-v-complexes
#9
Shashi Bhushan Sinha, Dimitar Y Shopov, Liam S Sharninghausen, Christopher J Stein, Brandon Q Mercado, David Balcells, Thomas Bondo Pedersen, Markus Reiher, Gary W Brudvig, Robert H Crabtree
Chemical and electrochemical oxidation or reduction of our recently reported Ir(IV,IV) mono-μ-oxo dimers results in the formation of fully characterized Ir(IV,V) and Ir(III,III) complexes. The Ir(IV,V) dimers are unprecedented and exhibit remarkable stability under ambient conditions. This stability and modest reduction potential of 0.99 V vs NHE is in part attributed to complete charge delocalization across both Ir centers. Trends in crystallographic bond lengths and angles shed light on the structural changes accompanying oxidation and reduction...
July 5, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28640299/anchoring-groups-for-photocatalytic-water-oxidation-on-metal-oxide-surfaces
#10
Kelly L Materna, Robert H Crabtree, Gary W Brudvig
Surface anchoring groups are needed to attach molecular units to photoanodes for photocatalytic water oxidation. The anchoring group must be hydrolytically stable and oxidation resistant under a variety of pH conditions. They must sometimes be electrically conducting for efficient light-induced electron injection from a photosensitizer to a metal oxide, but other times not conducting for accumulation of oxidizing equivalents on a water-oxidation catalyst. Commonly used anchors such as carboxylic acids and phosphonic acids have limited stability in aqueous environments, leading to surface hydrolysis and loss of catalytic function...
June 22, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28628943/antimony-complexes-for-electrocatalysis-activity-of-a-main-group-element-in-proton-reduction
#11
Jianbing Jiang, Kelly L Materna, Svante Hedström, Ke R Yang, Robert H Crabtree, Victor S Batista, Gary W Brudvig
Main-group complexes are shown to be viable electrocatalysts for the H2 -evolution reaction (HER) from acid. A series of antimony porphyrins with varying axial ligands were synthesized for electrocatalysis applications. The proton-reduction catalytic properties of TPSb(OH)2 (TP=5,10,15,20-tetra(p-tolyl)porphyrin) with two axial hydroxy ligands were studied in detail, demonstrating catalytic H2 production. Experiments, in conjunction with quantum chemistry calculations, show that the catalytic cycle is driven via the redox activity of both the porphyrin ligand and the Sb center...
June 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28621576/tethering-of-lsh-at-the-oct4-locus-promotes-gene-repression-associated-with-epigenetic-changes
#12
Jianke Ren, Nathaniel A Hathaway, Gerald R Crabtree, Kathrin Muegge
Lsh is a chromatin remodeling factor that regulates DNA methylation and chromatin function in mammals. The dynamics of these chromatin changes and whether they are directly controlled by Lsh remain unclear. To understand the molecular mechanisms of Lsh chromatin controlled regulation of gene expression, we established a tethering system that recruits a Gal4-Lsh fusion protein to an engineered Oct4 locus through Gal4 binding sites in murine embryonic stem (ES) cells. We examined the molecular epigenetic events induced by Lsh binding including: histone modification, DNA methylation and chromatin accessibility to determine nucleosome occupancy before and after embryonic stem cell differentiation...
June 16, 2017: Epigenetics: Official Journal of the DNA Methylation Society
https://www.readbyqxmd.com/read/28520895/distribution-patterns-of-saccharomyces-species-in-cultural-landscapes-of-germany
#13
Michael Brysch-Herzberg, Martin Seidel
The distribution patterns of the three Saccharomyces species, S. paradoxus, S. uvarum and S. cerevisiae, were investigated by a culture-dependent approach in order to understand better how these species propagate in the cultural landscape of Germany. Saccharomyces paradoxus, the closest relative of S. cerevisiae, is shown to be a true woodland species. It was frequentely found in the soil under conifers indicating that S. paradoxus is an autochthonous member of the microbial community in this habitat. Physiological characteristics of the species like the Crabtree effect and high tolerance against ethanol suggest that the species is adapted to regular supply with considerable amounts of sugars...
May 17, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28487284/implementation-of-a-timed-electronic-assessment-driven-potassium-replacement-protocol
#14
Christopher Zielenski, Adam Crabtree, Tien Le, Alyse Marlatt, Dana Ng, Alan Tran
PURPOSE: The adherence to and effectiveness and safety of a timed, electronic, assessment-driven potassium-replacement protocol (TARP) were compared with an electronic nurse-driven replacement protocol (NRP) are reported. METHODS: A retrospective observational study was conducted in a community hospital evaluating protocol adherence, effectiveness, and safety for 2 potassium-replacement protocols. All adults on medical units with an order for potassium replacement per protocol during the 3-month trial periods were reviewed...
May 9, 2017: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/28482870/effect-of-the-cancer-specific-shorter-form-of-human-6-phosphofructo-1-kinase-on-the-metabolism-of-the-yeast-saccharomyces-cerevisiae
#15
Darjan Andrejc, Alenka Možir, Matic Legiša
BACKGROUND: At first glance, there appears to be a high degree of similarity between the metabolism of yeast (the Crabtree effect) and human cancer cells (the Warburg effect). At the root of both effects is accelerated metabolic flow through glycolysis which leads to overflows of ethanol and lactic acid, respectively. It has been proposed that enhanced glycolytic flow in cancer cells is triggered by the altered kinetic characteristics of the key glycolytic regulatory enzyme 6-phosphofructo-1-kinase (Pfk)...
May 8, 2017: BMC Biotechnology
https://www.readbyqxmd.com/read/28473092/acr-appropriateness-criteria-%C3%A2-suspected-pulmonary-hypertension
#16
Arlene Sirajuddin, Edwin F Donnelly, Traves P Crabtree, Travis S Henry, Mark D Iannettoni, Geoffrey B Johnson, Ella A Kazerooni, Fabien Maldonado, Kathryn M Olsen, Carol C Wu, Tan-Lucien Mohammed, Jeffrey P Kanne
Pulmonary hypertension may be idiopathic or related to a large variety of diseases. Various imaging examinations that may be helpful in diagnosing and determining the etiology of pulmonary hypertension are discussed. Imaging examinations that may aid in the diagnosis of pulmonary hypertension include chest radiography, ultrasound echocardiography, ventilation/perfusion scans, CT, MRI, right heart catheterization, pulmonary angiography, and fluorine-18-2-fluoro-2-deoxy-d-glucose PET/CT. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel...
May 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/28472303/the-effect-of-whole-body-vibration-training-on-bone-and-muscle-function-in-children-with-osteogenesis-imperfecta
#17
Wolfgang Högler, Janis Scott, Nick Bishop, Paul Arundel, Peter Nightingale, M Zulf Mughal, Raja Padidela, Nick Shaw, Nicola Crabtree
Context: Osteogenesis imperfecta (OI) is a bone fragility disorder associated with reduced muscle size, dynamic muscle function and mobility. Objective: To assess the effect of whole body vibration (WBV) training on bone density and geometry, muscle size and function, mobility, and balance in children with OI. Design: Randomised controlled pilot trial. Setting: Tertiary paediatric research centre. Participants: Twenty-four children (5-16 years) with OI types 1,4 and limited mobility (CHAQ score ≥0...
May 3, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28451313/neutral-iridium-catalysts-with-chiral-phosphine-carboxy-ligands-for-asymmetric-hydrogenation-of-unsaturated-carboxylic-acids
#18
Shuang Yang, Wen Che, Hui-Ling Wu, Shou-Fei Zhu, Qi-Lin Zhou
We developed neutral iridium catalysts with chiral spiro phosphine-carboxy ligands (SpiroCAP) for asymmetric hydrogenation of unsaturated carboxylic acids. Different from the cationic Crabtree-type catalysts, the iridium catalysts with chiral spiro phosphine-carboxy ligands are neutral and do not require the use of a tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (BArF(-)) counterion, which is necessary for stabilizing cationic Crabtree-type catalysts. Another advantage of the neutral iridium catalysts is that they have high stability and have a long lifetime in air...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28451293/a-full-set-of-iridium-iv-pyridine-alkoxide-stereoisomers-highly-geometry-dependent-redox-properties
#19
Dimitar Y Shopov, Benjamin Rudshteyn, Jesús Campos, David J Vinyard, Victor S Batista, Gary W Brudvig, Robert H Crabtree
We introduce and characterize the complete set of possible isomers of Ir(IV)(pyalk)2Cl2 (pyalk = 2-(pyridin-2-yl)propan-2-oate), providing valuable insights on the properties of Ir(iv) species. The pyridine alkoxide ligand strongly stabilizes high oxidation states, essential to accessing the catalytically relevant Ir(iv) state, and results in robust complexes that can be handled under ambient conditions, even permitting chromatographic separation. The redox properties are isomer-dependent, spanning a 300 mV range, rationalized with ligand-field theory and DFT calculations...
February 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28450890/multi-class-computational-evolution-development-benchmark-evaluation-and-application-to-rna-seq-biomarker-discovery
#20
Nathaniel M Crabtree, Jason H Moore, John F Bowyer, Nysia I George
BACKGROUND: A computational evolution system (CES) is a knowledge discovery engine that can identify subtle, synergistic relationships in large datasets. Pareto optimization allows CESs to balance accuracy with model complexity when evolving classifiers. Using Pareto optimization, a CES is able to identify a very small number of features while maintaining high classification accuracy. A CES can be designed for various types of data, and the user can exploit expert knowledge about the classification problem in order to improve discrimination between classes...
2017: BioData Mining
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