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Right isomerism

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https://www.readbyqxmd.com/read/30054575/publisher-correction-a-new-fundamental-type-of-conformational-isomerism
#1
Peter J Canfield, Iain M Blake, Zheng-Li Cai, Ian J Luck, Elmars Krausz, Rika Kobayashi, Jeffrey R Reimers, Maxwell J Crossley
In the version of this Article originally published, the word 'stereoisomerism' was erroneously included in the label of the upper-right box of Fig. 1. The label within the box has been corrected and it now reads: "Constitutional isomerism (same formula, different connectivity)". This has been corrected in the online version of the Article.
July 27, 2018: Nature Chemistry
https://www.readbyqxmd.com/read/30051939/entropic-allostery-dominates-the-phosphorylation-dependent-regulation-of-syk-tyrosine-kinase-release-from-immunoreceptor-tyrosine-based-activation-motifs
#2
Chao Feng, Amitava Roy, Carol Beth Post
Spleen tyrosine kinase (Syk) is an essential player in immune signaling through its ability to couple multiple classes of membrane immunoreceptors to intracellular signaling pathways. Ligand binding leads to the recruitment of Syk to a phosphorylated cytoplasmic region of the receptors called ITAM. Syk binds to ITAM with high-affinity (nanomolar Kd ) via its tandem pair of SH2 domains. The affinity between Syk and ITAM is allosterically regulated by phosphorylation at Y130 in a linker connecting the tandem SH2 domains; when Y130 is phosphorylated, the binding affinity decreases (micromolar Kd )...
July 27, 2018: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/30049892/heterotaxy-syndrome-and-intestinal-rotation-abnormalities
#3
Lindsay M Ryerson, Scott Pharis, Charissa Pockett, Reeni Soni, Deborah Fruitman, Kristine J Guleserian, Melissa Nater, Stephen C Raynor, Andrew S Mackie, Bryan Dicken
BACKGROUND: Infants with heterotaxy syndrome (HS) have abnormal lateralization of organs along the right-left body axis. Intestinal rotation abnormalities (IRAs) are a potential source of morbidity and mortality. For this study, our objective was to prospectively observe a cohort of infants with HS and determine the incidence and natural history of IRA. METHODS: Infants ≤6 months of age with HS were enrolled in this prospective observational study. Exclusion criteria were other congenital abnormalities that necessitated abdominal surgery...
August 2018: Pediatrics
https://www.readbyqxmd.com/read/30041775/long-term-survival-and-phenotypic-spectrum-in-heterotaxy-syndrome-a-25-year-follow-up-experience
#4
Anwar Baban, Nicoletta Cantarutti, Rachele Adorisio, Roberta Lombardi, Giulio Calcagni, Eva Piano Mortari, Bruno Dallapiccola, Bruno Marino, Fiore Salvatore Iorio, Rita Carsetti, Maria Cristina Digilio, Salvatore Giannico, Fabrizio Drago, Adriano Carotti
BACKGROUND: Heterotaxy syndrome (HS) is a group of congenital disorders characterized by abnormal arrangement of thoraco-abdominal organs across the left-right axis of the body, classified as right (RAI) and left atrial isomerism (LAI)·We investigated the long-term survival and phenotypic spectrum in our HS cohort. Results are compared to literature data. METHODS: This is a single centre, observational, both retro and prospective study. Cardiac features, surgical management and abdominal ultrasound (US) of all HS patients were reviewed or investigated if missing...
October 1, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/30003594/pharmacological-effects-of-the-isomeric-mixture-of-alpha-and-beta-amyrin-from-protium-heptaphyllum-a-literature-review
#5
REVIEW
Amaurilio O Nogueira, Yasmin Ingrid S Oliveira, Beatriz L Adjafre, Maria E Amaral de Moraes, Gislei F Aragão
Protium heptaphyllum Aubl. belongs to the Burseraceae family. It is commonly called 'almecegueira' and is known to produce an amorphous resin which has constituents such as α- and β-amyrin, taraxastan-3-oxo-20-ol and sitostenonein. The α- and β-amyrin from P. heptaphyllum have pharmacological activities in several systems, such as central and peripheral nervous system, gastrointestinal tract and immunological system. In this study, our objective was to review pharmacological activities and to gather more information on the mixture of α- and β-amyrin obtained from P...
July 13, 2018: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/29998474/simultaneous-enantioseparation-of-methcathinone-and-two-isomeric-methylmethcathinones-using-capillary-electrophoresis-assisted-by-2-hydroxyethyl-%C3%AE-cyclodextrin
#6
Paweł Mateusz Nowak, Katarzyna Olesek, Michał Woźniakiewicz, Paweł Kościelniak
Methcathinone (ephedrone), 4-methylmethcathinone (mephedrone), and 3-methylmethcathinone (metaphedrone) are toxicologically-important cathinone derivatives used commonly as designer drugs. In this work we show the first method allowing to separate simultaneously all these molecules in a chiral medium, ensuring good resolution between all enantiomers. Eight cyclodextrins have been tested as potential chiral selectors, the best results were obtained with 2-hydroxyethyl-β-cyclodextrin, unreported so far for efficient separation of cathinones...
July 11, 2018: Electrophoresis
https://www.readbyqxmd.com/read/29992973/a-requirement-for-zic2-in-the-regulation-of-nodal-expression-underlies-the-establishment-of-left-sided-identity
#7
Iain M Dykes, Dorota Szumska, Linta Kuncheria, Rathi Puliyadi, Chiann-Mun Chen, Costis Papanayotou, Helen Lockstone, Christèle Dubourg, Véronique David, Jurgen E Schneider, Thomas M Keane, David J Adams, Steve D M Brown, Sandra Mercier, Sylvie Odent, Jérôme Collignon, Shoumo Bhattacharya
ZIC2 mutation is known to cause holoprosencephaly (HPE). A subset of ZIC2 HPE probands harbour cardiovascular and visceral anomalies suggestive of laterality defects. 3D-imaging of novel mouse Zic2 mutants uncovers, in addition to HPE, laterality defects in lungs, heart, vasculature and viscera. A strong bias towards right isomerism indicates a failure to establish left identity in the lateral plate mesoderm (LPM), a phenotype that cannot be explained simply by the defective ciliogenesis previously noted in Zic2 mutants...
July 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29954599/effect-of-prenatal-laterality-disturbance-and-its-accompanying-anomalies-on-survival
#8
Trisha V Vigneswaran, Caroline B Jones, Vita Zidere, Marietta Charakida, Owen I Miller, John M Simpson, Gurleen K Sharland
In this retrospective, observational study of fetuses diagnosed with a laterality disturbance we describe the findings and outcome of fetuses diagnosed between 1980 and 2017 at a tertiary fetal-pediatric cardiology unit. In addition we sought to identify features which impact on outcome. Left atrial isomerism (LAI) was diagnosed in 177 babies and right atrial isomerism (RAI) in 100. Major structural heart disease was present in all cases of RAI and 91% with LAI. Complete heart block (CHB) was present in 40% of LAI...
June 20, 2018: American Journal of Cardiology
https://www.readbyqxmd.com/read/29945867/bsx-controls-pineal-complex-development
#9
Theresa Schredelseker, Wolfgang Driever
Neuroendocrine cells in the pineal gland release melatonin during the night and, in teleosts, are directly photoreceptive. During development of the pineal complex, a small number of cells migrate leftward away from the pineal anlage to form the parapineal cell cluster, a process that is crucial for asymmetrical development of the bilateral habenular nuclei. Here, we show that, throughout zebrafish embryonic development, the brain-specific homeobox ( bsx ) gene is expressed in all cell types of the pineal complex...
July 9, 2018: Development
https://www.readbyqxmd.com/read/29931831/sequential-alkene-isomerization-and-ring-closing-metathesis-in-production-of-macrocyclic-musks-from-biomass
#10
Adrian Sytniczuk, Gwénaël Forcher, Douglas B Grotjahn, Karol Grela
We report successful utilization of sequential alkene isomerization and ring-closing metathesis of dec-9-enoic acid based dienes in synthesis of macrocyclic lactones that possess a strong scent of musk. This catalytic sequence was essential to trim the chain length of starting dienes to yield macrocycles of the right size. Dec-9-enoic acid is conveniently obtainable from oleic esters by Ru-catalysed ethenolysis.
June 21, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29899961/azobenzene-as-a-photoregulator-covalently-attached-to-rna-a-quantum-mechanics-molecular-mechanics-surface-hopping-dynamics-study
#11
Padmabati Mondal, Giovanni Granucci, Dominique Rastädter, Maurizio Persico, Irene Burghardt
The photoregulation of nucleic acids by azobenzene photoswitches has recently attracted considerable interest in the context of emerging biotechnological applications. To understand the mechanism of photoinduced isomerisation and conformational control in these complex biological environments, we employ a Quantum Mechanics/Molecular Mechanics (QM/MM) approach in conjunction with nonadiabatic Surface Hopping (SH) dynamics. Two representative RNA-azobenzene complexes are investigated, both of which contain the azobenzene chromophore covalently attached to an RNA double strand via a β-deoxyribose linker...
May 28, 2018: Chemical Science
https://www.readbyqxmd.com/read/29877535/the-unsuspected-influence-of-the-pyridyl-triazole-ligand-isomerism-upon-the-electronic-properties-of-tricarbonyl-rhenium-complexes-an-experimental-and-theoretical-insight
#12
Jinhui Wang, Béatrice Delavaux-Nicot, Mariusz Wolff, Sonia Mallet-Ladeira, Rémi Métivier, Eric Benoist, Suzanne Fery-Forgues
Two isomeric tricarbonyl rhenium(i) complexes, ReL1 and ReL2, that possess a 2-pyridyl-1,2,n-triazole (pyta) ligand (n = 4 and 3, respectively) connected to a 2-phenylbenzoxazole (PBO) moiety, were synthesized in good yields. The X-ray structures showed that in ReL1 the PBO moiety and the pyta ligand almost form a right angle hindering electron delocalization, while in ReL2 their nearly planar arrangement favors the electron delocalization in the whole organic ligand. Therefore, the nature of the ligand significantly influences the electron distribution in the two complexes, as indicated by the results of TD-DFT calculations...
June 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29813180/influence-of-photoinduced-isomerization-on-the-chiral-separation-of-novel-liquid-crystalline-materials-with-a-diazene-moiety
#13
Terézia Jurkovičová Vojtylová, Martin Cigl, Petra Tomášková, Věra Hamplová, David Sýkora
The influence of photoinduced isomerization on the enantiomeric separation of two newly synthesized liquid crystalline materials, liquid crystals 1 and 2, was studied by high-performance liquid chromatography on a chiral stationary phase Chiralpack AD-3. Both materials have one chiral center and one diazene moiety. The compounds were separated into their E and Z isomeric forms. The conditions and time scale of the ultraviolet-induced E to Z transition were briefly evaluated. Under the optimized conditions, we were able to baseline separate the S and R enantiomers of both the studied materials in their E isomeric form...
May 29, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29779315/-improving-outcomes-of-patients-with-heterotaxy-and-functional-single-ventricle-a-10-year-follow-up-of-70-cases-in-a-single-institution
#14
F Cao, M H Zou, L Ma, Y S Xia, S C Yang, W D Chen, G D Huang, X X Chen
Objective: To review current-era palliation outcomes of patients with heterotaxy and functional single ventricle in a single institution. Methods: The clinical data of 70 consecutive patients with heterotaxy undergoing multistage single ventricle palliation in Guangzhou Women and Children's Medical Center from January 2008 to December 2017 were retrospectively reviewed, and the prognosis factors for mortality were analyzed. There were 53 male and 17 female patients.The median age was 13.3 months (range: 6 days to 150 months)...
May 1, 2018: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/29779229/codeinone-reductase-isoforms-with-differential-stability-efficiency-and-product-selectivity-in-opium-poppy
#15
Mehran Dastmalchi, Limei Chang, Miguel A Torres, Kenneth K S Ng, Peter J Facchini
Codeinone reductase (COR) catalyzes the reversible NADPH-dependent reduction of codeinone to codeine as the penultimate step of morphine biosynthesis in opium poppy (Papaver somniferum). It also irreversibly reduces neopinone, which forms by spontaneous isomerization in aqueous solution from codeinone, to neopine. In a parallel pathway involving 3-O-demethylated analogs, COR converts morphinone to morphine, and neomorphinone to neomorphine. Similar to neopine, the formation of neomorphine by COR is irreversible...
May 19, 2018: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/29777280/primary-draining-vein-stenting-for-obstructive-total-anomalous-pulmonary-venous-connection-in-neonates-with-right-atrial-isomerism-and-functional-single-ventricle-improves-outcome
#16
Masataka Kitano, Takaya Hoashi, Takashi Kakuta, Kazuto Fujimoto, Akira Miyake, Ken-Ichi Kurosaki, Hazime Ichikawa, Isao Shiraishi
For neonates with right atrial isomerism (RAI), functional single ventricle (f-SV), and obstructive total anomalous pulmonary venous connection (TAPVC), primary TAPVC repair (TAPVCR) has a poor outcome. At our hospital, the survival rate at 1 year of such neonates undergoing primary TAPVCR between 1999 and 2010 (TAPVCR group) was 30% (3/10). Most deceased cases suffered from capillary leak syndrome and unstable pulmonary resistance after the surgeries. We sought to determine whether less invasive primary draining vein stenting (DVS) improved the outcome of these neonates...
May 18, 2018: Pediatric Cardiology
https://www.readbyqxmd.com/read/29775214/pressurized-hot-water-extraction-of-bioactive-compounds-from-artichoke-by-products
#17
Imma Pagano, Anna Lisa Piccinelli, Rita Celano, Luca Campone, Patrizia Gazzerro, Mariateresa Russo, Luca Rastrelli
Artichoke by-products are a suitable source of health-promoting ingredients for the production of dietary supplements and food additives. A pressurized hot water extraction (PHWE) was developed to recover caffeoylquinic acids (CQAs) and flavone glycosides (FLs) from agro-industrial artichoke by-products. The main factors influencing PHWE efficiency and CQA isomerization (temperature, numbers of cycles, modifier, and extraction time) were carefully studied and optimized by response surface design. The proposed PHWE procedure provides an exhaustive extraction of CQAs and FLs (recoveries: 93-105% and 90-105%) from artichoke external bracts and leaves of different cultivars (p > 0...
May 18, 2018: Electrophoresis
https://www.readbyqxmd.com/read/29676852/asp-58-modulates-lens-%C3%AE-a-crystallin-oligomer-formation-and-chaperone-function
#18
Takumi Takata, Tooru Nakamura-Hirota, Rintaro Inoue, Ken Morishima, Nobuhiro Sato, Masaaki Sugiyama, Noriko Fujii
Senile cataract onset is caused by insolubilization of lens proteins. The lens crystallin protein family correctly orders the formation of homo- or hetero-oligomers in lens fiber cells. Because lens fiber cells do not divide, covalent post-translational modifications, such as isomerization of aspartate residues, accumulate with aging. Although many isomerization sites of αA-crystallin have been reported, their structural and functional contributions have never been identified. In this study, αA-crystallin was extracted from aged human lens and separated into each oligomeric state by size exclusion chromatography and electrophoresis...
June 2018: FEBS Journal
https://www.readbyqxmd.com/read/29571748/structural-basis-of-the-signal-transduction-via-transmembrane-domain-of-the-human-growth-hormone-receptor
#19
Eduard V Bocharov, Dmitry M Lesovoy, Olga V Bocharova, Anatoly S Urban, Konstantin V Pavlov, Pavel E Volynsky, Roman G Efremov, Alexander S Arseniev
BACKGROUND: Prior studies of the human growth hormone receptor (GHR) revealed a distinct role of spatial rearrangements of its dimeric transmembrane domain in signal transduction across membrane. Detailed structural information obtained in the present study allowed elucidating the bases of such rearrangement and provided novel insights into receptor functioning. METHODS: We investigated the dimerization of recombinant TMD fragment GHR254-294 by means of high-resolution NMR in DPC micelles and molecular dynamics in explicit POPC membrane...
June 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29507233/chirality-controlled-spontaneous-twisting-of-crystals-due-to-thermal-topochemical-reaction
#20
Rishika Rai, Baiju P Krishnan, Kana M Sureshan
Crystals that show mechanical response against various stimuli are of great interest. These stimuli induce polymorphic transitions, isomerizations, or chemical reactions in the crystal and the strain generated between the daughter and parent domains is transcribed into mechanical response. We observed that the crystals of modified dipeptide LL (N3 -l-Ala-l-Val-NHCH2 C≡CH) undergo spontaneous twisting to form right-handed twisted crystals not only at room temperature but also at 0 °C over time. Using various spectroscopic techniques, we have established that the twisting is due to the spontaneous topochemical azide-alkyne cycloaddition (TAAC) reaction at room temperature or lower temperatures...
March 20, 2018: Proceedings of the National Academy of Sciences of the United States of America
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