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https://www.readbyqxmd.com/read/29161635/temperature-dependent-conformational-dynamics-of-cytochrome-c-implications-in-apoptosis
#1
Gurusamy Muneeswaran, Subramanian Kartheeswaran, Kaliappan Muthukumar, Chandran Karunakaran
Heat, electric shock, and burn injuries induce apoptosis by releasing cytochrome c (cyt-c) from mitochondria and by subsequently activating the death protease, caspases-3. During apoptosis, cyt-c undergoes changes in the secondary structure that have been suggested to increase its peroxidase activity. Information about these structural changes will provide better understanding of the apoptotic mechanism. Hence, temperature-dependent conformational dynamics of cyt-c has been investigated through molecular dynamics (MD) simulations to explain the structural changes and to correlate them with its apoptotic behavior...
October 20, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29161413/nrf2-regulates-endothelial-glycolysis-and-proliferation-with-mir-93-and-mediates-the-effects-of-oxidized-phospholipids-on-endothelial-activation
#2
Suvi M Kuosmanen, Emilia Kansanen, Minna U Kaikkonen, Virve Sihvola, Kati Pulkkinen, Henna-Kaisa Jyrkkänen, Pauli Tuoresmäki, Juha Hartikainen, Mikko Hippeläinen, Hannu Kokki, Pasi Tavi, Sami Heikkinen, Anna-Liisa Levonen
Phospholipids, such as 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine (PAPC), are the major components of cell membranes. Their exposure to reactive oxygen species creates oxidized phospholipids, which predispose to the development of chronic inflammatory diseases and metabolic disorders through endothelial activation and dysfunction. Although the effects of oxidized PAPC (oxPAPC) on endothelial cells have been previously studied, the underlying molecular mechanisms evoking biological responses remain largely unknown...
November 17, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29161278/resilience-of-honeybee-colonies-via-common-stomach-a-model-of-self-regulation-of-foraging
#3
Thomas Schmickl, Istvan Karsai
We propose a new regulation mechanism based on the idea of the "common stomach" to explain several aspects of the resilience and homeostatic regulation of honeybee colonies. This mechanism exploits shared pools of substances (pollen, nectar, workers, brood) that modulate recruitment, abandonment and allocation patterns at the colony-level and enable bees to perform several survival strategies to cope with difficult circumstances: Lack of proteins leads to reduced feeding of young brood, to early capping of old brood and to regaining of already spent proteins through brood cannibalism...
2017: PloS One
https://www.readbyqxmd.com/read/29160870/engineering-high-performance-hairpin-stacking-circuits-for-logic-gate-operation-and-highly-sensitive-biosensing-assay-of-microrna
#4
Yueli Xing, Xinmin Li, Taixian Yuan, Wei Cheng, Dandan Li, Tianxiao Yu, Xiaojuan Ding, Shijia Ding
Recently, hairpin stacking circuits (HSC) based on toehold-mediated strand displacement have been engineered to detect nucleic acids and proteins. However, the three metastable hairpins in a HSC system can potentially react non-specifically in the absence of a catalyst, limiting its practical application. Here, we developed a unique hairpin design guideline to eliminate circuit leakage of HSC, and the high-performance HSC was successfully implemented on logic gate building and biosensing. We began by analyzing the sources of circuit leakage and optimizing the toehold lengths of hairpins in the HSC system based on the surface plasmon resonance (SPR) technique...
November 21, 2017: Analyst
https://www.readbyqxmd.com/read/29160309/structure-of-pink1-in-complex-with-its-substrate-ubiquitin
#5
Alexander F Schubert, Christina Gladkova, Els Pardon, Jane L Wagstaff, Stefan M V Freund, Jan Steyaert, Sarah L Maslen, David Komander
Autosomal recessive juvenile Parkinsonism (AR-JP) is caused by mutations in a number of PARK genes, in particular in the E3 ubiquitin ligase Parkin (PARK2), and in its upstream protein kinase PINK1 (PARK6). PINK1 phosphorylates ubiquitin and the Parkin ubiquitin-like domain on structurally protected Ser65 to trigger mitophagy. We here report a crystal structure of a nanobody-stabilised complex between Pediculus humanus corporis (Ph)PINK1 with ubiquitin in the 'C-terminally retracted' (Ub-CR) conformation. The structure reveals many peculiarities of PINK1, including the architecture of the C-terminal region, and reveals how the PINK1 N-lobe binds ubiquitin via a unique insertion...
October 30, 2017: Nature
https://www.readbyqxmd.com/read/29159870/predictive-hyperglycemia-and-hypoglycemia-minimization-in-home-double-blind-randomized-controlled-evaluation-in-children-and-young-adolescents
#6
Gregory P Forlenza, Dan Raghinaru, Faye Cameron, B Wayne Bequette, H Peter Chase, R Paul Wadwa, David M Maahs, Emily Jost, Trang T Ly, Darrell M Wilson, Lisa Norlander, Laya Ekhlaspour, Hyojin Min, Paula Clinton, Nelly Njeru, John W Lum, Craig Kollman, Roy W Beck, Bruce A Buckingham
OBJECTIVE: The primary objective of this trial was to evaluate the feasibility, safety, and efficacy of a predictive hyperglycemia and hypoglycemia minimization (PHHM) system vs predictive low glucose suspension (PLGS) alone in optimizing overnight glucose control in children 6 to 14 years old. RESEARCH DESIGN AND METHODS: Twenty-eight participants 6 to 14 years old with T1D duration ≥1 year with daily insulin therapy ≥12 months and on insulin pump therapy for ≥6 months were randomized per night into PHHM mode or PLGS-only mode for 42 nights...
November 20, 2017: Pediatric Diabetes
https://www.readbyqxmd.com/read/29159603/prophylactic-intraperitoneal-onlay-mesh-reinforcement-reduces-the-risk-of-incisional-hernia-two-year-results-of-a-randomized-clinical-trial
#7
Philippe Brosi, Philippe M Glauser, Benjamin Speich, Samuel A Käser, Christoph A Maurer
BACKGROUND: Incisional hernias still are a major concern after laparotomy and are causing substantial morbidity. This study examines the feasibility, safety and incisional hernia rate of the use of a prophylactic intraperitoneal onlay mesh stripe (IPOM) to prevent incisional hernia following midline laparotomy. METHODS: This prospective, randomized controlled trial randomly allocated patients undergoing median laparotomy either to mass closure of the abdominal wall with a PDS-loop running suture reinforced by an intraperitoneal composite mesh stripe (Group A) or to the same procedure without the additional mesh stripe (Group B)...
November 20, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/29159555/use-of-a-hands-free-instantaneous-closed-loop-communication-device-improves-perception-of-communication-and-workflow-integration-in-an-academic-teaching-hospital-a-pilot-study
#8
Daniel Z Fang, Teja Patil, Ilana Belitskaya-Levy, Marianne Yeung, Keith Posley, Nazima Allaudeen
Efficient and effective communication between providers is critical to quality patient care within a hospital system. Hands free communication devices (HFCD) allow instantaneous, closed-loop communication between physicians and other members of a multidisciplinary team, providing a communication advantage over traditional pager systems. HFCD have been shown to decrease emergency room interruptions, improve nursing communication, improve speed of information flow, and eliminate health care waste. We evaluated the integration of an HFCD with an existing alphanumeric paging system on an acute inpatient medicine service...
November 17, 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/29159497/correction-to-superior-biomechanical-properties-and-tying-time-with-the-modified-prusik-knot-and-wittstein-suture-loop-to-the-krackow-stitch
#9
Chih-Kai Hong, Cheng-Li Lin, Jui-Ming Yang, Chien-An Shih, Yi-Chuan Chou, Ming-Long Yeh, Chen-Hao Chiang, Wei-Ren Su
Due to an error during the production process, the legend.
November 20, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29159233/data-for-the-homology-modelling-of-the-red-pigment-concentrating-hormone-receptor-dappu-rpchr-of-the-crustacean-daphnia-pulex-and-docking-of-its-cognate-agonist-dappu-rpch
#10
Graham E Jackson, Elumalai Pavadai, Gerd Gäde, Zaheer Timol, Niels H Andersen
The data presented in this article are related to the publication "Interaction of the red pigment-concentrating hormone of the crustacean Daphnia pulex, with its cognate receptor, Dappu-RPCHR: A nuclear magnetic resonance and modeling study" (Jackson et al., 2017) [1]. This article contains the data for homology modeling of the red pigment-concentrating hormone (RPCH) receptor of the water flea, Daphnia pulex (Dappu-RPCHR), which was constructed from its primary sequence. This is the first 3D model of a crustacean G-protein coupled receptor...
December 2017: Data in Brief
https://www.readbyqxmd.com/read/29158594/re-evaluation-of-the-origin-of-relaxor-ferroelectricity-in-vinylidene-fluoride-terpolymers-an-approach-using-switching-current-measurements
#11
Naoto Tsutsumi, Kyohei Okumachi, Kenji Kinashi, Wataru Sakai
Relaxor-ferroelectric vinylidene fluoride (VDF)-based terpolymers have attracted increased attention for industrial applications because of their large dielectric constants, low voltage operation for nonvolatile memory, and energy storage capabilities. However, the origin of the relaxor ferroelectricity of VDF-based terpolymers is still under investigation. Here, we investigate the ferroelectric behaviour of thin films of terpolymers of VDF, trifluoroethylene (TrFE), and chlorofluoroethylene (CFE) (P(VDF-TrFE-CFE)) and terpolymers of VDF, TrFE, and chlorotrifluoroethylene (CTFE) (P(VDF-TrFE-CTFE)) using switching current - electric field (I-E) loop measurements...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29158486/bl-hi-c-is-an-efficient-and-sensitive-approach-for-capturing-structural-and-regulatory-chromatin-interactions
#12
Zhengyu Liang, Guipeng Li, Zejun Wang, Mohamed Nadhir Djekidel, Yanjian Li, Min-Ping Qian, Michael Q Zhang, Yang Chen
In human cells, DNA is hierarchically organized and assembled with histones and DNA-binding proteins in three dimensions. Chromatin interactions play important roles in genome architecture and gene regulation, including robustness in the developmental stages and flexibility during the cell cycle. Here we propose in situ Hi-C method named Bridge Linker-Hi-C (BL-Hi-C) for capturing structural and regulatory chromatin interactions by restriction enzyme targeting and two-step proximity ligation. This method improves the sensitivity and specificity of active chromatin loop detection and can reveal the regulatory enhancer-promoter architecture better than conventional methods at a lower sequencing depth and with a simpler protocol...
November 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/29158482/structural-basis-for-the-unique-ganglioside-and-cell-membrane-recognition-mechanism-of-botulinum-neurotoxin-dc
#13
Sicai Zhang, Ronnie P-A Berntsson, William H Tepp, Liang Tao, Eric A Johnson, Pål Stenmark, Min Dong
Botulinum neurotoxins (BoNTs), the most potent toxins known, are potential bioterrorism agents. It is well established that all seven serotypes of BoNTs (BoNT/A-G) require complex gangliosides as co-receptors. Here, we report that BoNT/DC, a presumed mosaic toxin between BoNT/D and BoNT/C1, binds and enters efficiently into neurons lacking complex gangliosides and shows no reduction in toxicity in mice deficient in complex gangliosides. The co-crystal structure of BoNT/DC with sialyl-Thomsen-Friedenreich antigen (Sialyl-T) suggests that BoNT/DC recognizes only the sialic acid, but not other moieties in gangliosides...
November 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/29158476/programmable-dna-looping-using-engineered-bivalent-dcas9-complexes
#14
Nan Hao, Keith E Shearwin, Ian B Dodd
DNA looping is a ubiquitous and critical feature of gene regulation. Although DNA looping can be efficiently detected, tools to readily manipulate DNA looping are limited. Here we develop CRISPR-based DNA looping reagents for creation of programmable DNA loops. Cleavage-defective Cas9 proteins of different specificity are linked by heterodimerization or translational fusion to create bivalent complexes able to link two separate DNA regions. After model-directed optimization, the reagents are validated using a quantitative DNA looping assay in E...
November 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/29158357/evidence-for-a-role-of-vascular-endothelium-in-the-control-of-arterial-wall-viscosity-in-humans
#15
Frederic Roca, Michele Iacob, Isabelle Remy-Jouet, Jeremy Bellien, Robinson Joannides
Arterial wall viscosity (AWV) is a major cause of energy dissipation along the arterial tree. Its determinants remain controversial but an active endothelial regulation has been suggested. Our objective was to assess in humans the physiological role of endothelium-derived nitric oxide (NO), epoxyeicosatrienoic acids and the effect of modulating smooth muscle tone in the regulation of AWV. We simultaneously measured radial artery diameter, wall thickness, and arterial pressure in healthy volunteers during the local infusion of inhibitors of NO-synthase (N(G)-monomethyl-l-arginine), epoxyeicosatrienoic acids synthesis by cytochrome P450 (fluconazole), the epoxyeicosatrienoic acids cellular targets calcium-activated potassium channels (tetraethylammonium), alone and in combination...
November 20, 2017: Hypertension
https://www.readbyqxmd.com/read/29158291/rad51c-xrcc3-facilitates-mitochondrial-dna-replication-and-maintains-integrity-of-the-mitochondrial-genome
#16
Anup Mishra, Sneha Saxena, Anjali Kaushal, Ganesh Nagaraju
Mechanisms underlying mitochondrial genome maintenance have recently gained wide attention as mutations in mitochondrial DNA (mtDNA) lead to inherited muscular and neurological diseases which are linked to aging. It has been previously reported that human RAD51, RAD51C and XRCC3 localize to mitochondria upon oxidative stress and are required for the maintenance of mtDNA stability. Since RAD51 and RAD51 paralogs are spontaneously imported into mitochondria, their precise role in mtDNA maintenance during unperturbed conditions remains elusive...
November 20, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/29158257/structural-dissection-of-an-interaction-between-transcription-initiation-and-termination-factors-implicated-in-promoter-terminator-crosstalk
#17
Matthew Bratkowski, Ilona Christy Unarta, Lizhe Zhu, Murtada Shubbar, Xuhui Huang, Xin Liu
Functional crosstalk between the promoter and terminator of a gene has long been noted. Promoters and terminators are juxtaposed to form gene loops in several organisms and gene looping is thought to be involved in transcriptional regulation. The general transcription factor II B (TFIIB) and the C-terminal domain phosphatase Ssu72, essential factors of the transcription pre-initiation complex and the mRNA processing and polyadenylation complex, respectively, are important for gene loop formation. TFIIB and Ssu72 interact both genetically and physically, but the molecular basis of this interaction is not known...
November 20, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29158134/the-inflammasome-pathway-is-amplified-and-perpetuated-in-an-autocrine-manner-through-connexin43-hemichannel-mediated-atp-release
#18
Odunayo O Mugisho, Colin R Green, Dan T Kho, Jie Zhang, E Scott Graham, Monica L Acosta, Ilva D Rupenthal
BACKGROUND: Connexin43 hemichannels have been implicated in many inflammatory diseases including diabetic retinopathy (DR). Particularly, hemichannel-mediated ATP release has been associated with inflammasome pathway activation. Using an in vitro cell culture model, we evaluated hemichannel roles in response to inflammatory cytokines under high glucose (HG) conditions and propose a mechanism by which a connexin43 hemichannel-mediated autocrine ATP feedback loop augments chronic inflammatory disease...
November 17, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29157961/improvement-of-intestinal-absorption-of-curcumin-by-cyclodextrins-and-the-mechanisms-underlying-absorption-enhancement
#19
Xinpeng Li, Sachiyo Uehara, Kasirawat Sawangrat, Masaki Morishita, Kosuke Kusamori, Hidemasa Katsumi, Toshiyasu Sakane, Akira Yamamoto
Curcumin is known to possess a wide range of pharmacological activities for the treatment of chronic or inflammatory diseases, Alzheimer's disease, and various cancers. However, the therapeutic efficacy of curcumin is restricted by its poor bioavailability after oral administration. In this study, the effects of various cyclodextrins on the intestinal absorption of curcumin were evaluated in rat intestine by an in situ closed-loop method. Among the tested cyclodextrins, 50 mM α-cyclodextrin significantly enhanced the absorption of curcumin without inducing any intestinal toxicity...
November 18, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29157917/the-mediator-complex-in-genomic-and-non-genomic-signaling-in-cancer
#20
Hannah Weber, Michael J Garabedian
Mediator is a conserved, multi-subunit macromolecular machine divided structurally into head, middle, and tail modules, along with a transiently associating kinase module. Mediator functions as an integrator of transcriptional regulatory activity by interacting with DNA-bound transcription factors and with RNA polymerase II (Pol II) to both activate and repress gene expression. Mediator has been shown to affect multiple steps in transcription, including chromatin looping between enhancers and promoters, pre-initiation complex formation, transcriptional elongation, and mRNA splicing...
November 17, 2017: Steroids
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