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https://www.readbyqxmd.com/read/27929739/timing-of-dna-lesion-recognition-ubiquitin-signalling-in-the-ner-pathway
#1
Shalaka Chitale, Holger Richly
Damaged DNA is repaired by specialized repair factors that are recruited in a well-orchestrated manner to the damage site. The DNA damage response at UV inflicted DNA lesions is accompanied by posttranslational modifications of DNA repair factors and the chromatin environment sourrounding the lesion. In particular, mono- and poly-ubiquitylation events are an integral part of the DNA damage signalling. Whereas ubiquitin signalling at DNA doublestrand breaks has been subject to intensive studies comparatively little is known about the intricacies of ubiquitylation events occuring during nucleotide excision repair (NER), the major pathway to remove bulky helix lesions...
December 8, 2016: Cell Cycle
https://www.readbyqxmd.com/read/27929460/the-synthesis-of-sn10-si-sime3-3-4-2-using-a-metastable-sn-i-halide-solution-synthesized-via-a-co-condensation-technique
#2
Mareike Binder, Claudio Schrenk, Andreas Schnepf
The number of well-characterized metalloid tin clusters, synthesized by applying the disproportionation of a metastable Sn(I) halide in the presence of a sterically demanding ligand, has increased in recent years. The metastable Sn(I) halide is synthesized at "outer space conditions" via the preparative co-condensation technique. Thereby, the subhalide is synthesized in an oven at high temperatures, around 1,300 °C, and at reduced pressure by the reaction of elemental tin with hydrogen halide gas (e.g., HCl)...
November 28, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27928602/-implementation-of-hybrid-notes-sigmoidectomy-for-diverticular-disease-in-a%C3%A2-center-for-minimally-invasive-surgery
#3
D C Steinemann, A Zerz, S H Lamm
BACKGROUND: Natural orifice transluminal endoscopic surgery (NOTES) describes surgical procedures through a natural orifice. In hybrid-NOTES small transabdominal trocars are combined with a NOTES access. OBJECTIVE: To evaluate hybrid-NOTES sigmoidectomy as a standard procedure for diverticulitis. MATERIAL AND METHODS: Elective laparoscopic sigmoidectomies performed between May 2011 and January 2016 were prospectively collated. Primary endpoint was the feasibility of hybrid-NOTES sigmoidectomy...
December 7, 2016: Der Chirurg; Zeitschrift Für Alle Gebiete der Operativen Medizen
https://www.readbyqxmd.com/read/27923926/reduced-activity-of-mutant-calcium-dependent-protein-kinase-1-is-compensated-in-plasmodium-falciparum-through-the-action-of-protein-kinase-g
#4
Abhisheka Bansal, Kayode K Ojo, Jianbing Mu, Dustin J Maly, Wesley C Van Voorhis, Louis H Miller
: We used a sensitization approach that involves replacement of the gatekeeper residue in a protein kinase with one with a different side chain. The activity of the enzyme with a bulky gatekeeper residue, such as methionine, cannot be inhibited using bumped kinase inhibitors (BKIs). Here, we have used this approach to study Plasmodium falciparum calcium-dependent protein kinase 1 (PfCDPK1). The methionine gatekeeper substitution, T145M, although it led to a 47% reduction in transphosphorylation, was successfully introduced into the CDPK1 locus using clustered regularly interspaced short palindromic repeat (CRISPR)/Cas9...
December 6, 2016: MBio
https://www.readbyqxmd.com/read/27919178/comparison-of-respiratory-inductive-plethysmography-versus-head-out-plethysmography-for-anesthetized-nonhuman-primates-in-an-animal-biosafety-level-4-facility
#5
J Kyle Bohannon, Anna N Honko, Rebecca J Reeder, Kurt Cooper, Russ Byrum, Laura Bollinger, Jens H Kuhn, Jiro Wada, Jing Qin, Peter B Jahrling, Matthew G Lackemeyer
For inhalational studies and aerosol exposures to viruses, head-out plethysmography acquisition has been traditionally used for the determination of estimated inhaled dose in anesthetized nonhuman primates prior to or during an aerosol exposure. A pressure drop across a pneumotachograph is measured within a sealed chamber during inspiration/exhalation of the nonhuman primate, generating respiratory values and breathing frequencies. Due to the fluctuation of depth of anesthesia, pre-exposure respiratory values can be variable, leading to less precise and accurate dosing calculations downstream...
December 5, 2016: Inhalation Toxicology
https://www.readbyqxmd.com/read/27919007/challenges-in-assignment-of-allosteric-effects-in-cytochrome-p450-catalyzed-substrate-oxidations-to-structural-dynamics-in-the-hemoprotein-architecture
#6
Peter Hlavica
Cytochrome P450s (CYP) represent a superfamily of b-type hemoproteins catalyzing NAD(P)H-dependent oxidative biotransformation of a vast array of natural and xenobiotic compounds. Many eu- and prokaryotic members of this class of monooxygenases display complex non-Michaelis-Menten saturation kinetics, suggestive of homo-/heterotropic cooperativity arising from substrate-/effector-induced allosteric interactions. Here, the paradigm of multiple-ligand occupancy of the catalytic pocket in combination with enzyme oligomerization provides the most favored explanations for the atypical kinetic patterns...
November 25, 2016: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/27918233/patient-satisfaction-after-auditory-implant-surgery-ten-year-experience-from-a-single-implanting-unit-center
#7
Simonetta Monini, Alessandra Bianchi, Rita Talamonti, Francesca Atturo, Chiara Filippi, Maurizio Barbara
CONCLUSIONS: The satisfaction rate of the subjects with an auditory implant appears strictly related to the resulting auditory improvement, and the surgical variables would play a prevailing role in respect to the esthetic factors. OBJECTIVES: To assess the rate of satisfaction in subjects who underwent the surgical application of an auditory device at a single Implanting Center Unit. METHOD: A series of validated questionnaires has been administered to subjects who underwent the surgical application of different auditory devices...
December 5, 2016: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/27917894/a-closer-look-into-the-%C3%AE-helix-basin
#8
Boris Haimov, Simcha Srebnik
α-Helices are the most abundant structures found within proteins and play an important role in the determination of the global structure of proteins and their function. Representation of α-helical structures with the common (φ, ψ) dihedrals, as in Ramachandran maps, does not provide informative details regarding the helical structure apart for the abstract geometric meaning of the dihedrals. We present an alternative coordinate system that describes helical conformations in terms of residues per turn (ρ) and angle (ϑ) between backbone carbonyls relative to the helix direction through an approximate linear transformation between the two coordinates system (φ, ψ and ρ, ϑ)...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27912833/treatment-of-locally-advanced-non-small-cell-lung-cancer
#9
REVIEW
Kit Tam, Megan Daly, Karen Kelly
Locally advanced non-small cell lung cancer is a heterogeneous disease with typically poor outcomes. Select patients may benefit from the integration of surgery, whereas patients with bulky, multistation, or contralateral (N3) mediastinal involvement are managed with definitive chemoradiation. Attempts to improve outcomes through induction, consolidation, or maintenance chemotherapy or radiation dose escalation have not demonstrated a survival benefit. Current research efforts focus on the integration of novel systemic agents that exploit tumor-specific driver mutations, augment antitumor immune response, or enhance radiation sensitivity...
February 2017: Hematology/oncology Clinics of North America
https://www.readbyqxmd.com/read/27911765/optical-magnetic-detection-of-single-neuron-action-potentials-using-quantum-defects-in-diamond
#10
John F Barry, Matthew J Turner, Jennifer M Schloss, David R Glenn, Yuyu Song, Mikhail D Lukin, Hongkun Park, Ronald L Walsworth
Magnetic fields from neuronal action potentials (APs) pass largely unperturbed through biological tissue, allowing magnetic measurements of AP dynamics to be performed extracellularly or even outside intact organisms. To date, however, magnetic techniques for sensing neuronal activity have either operated at the macroscale with coarse spatial and/or temporal resolution-e.g., magnetic resonance imaging methods and magnetoencephalography-or been restricted to biophysics studies of excised neurons probed with cryogenic or bulky detectors that do not provide single-neuron spatial resolution and are not scalable to functional networks or intact organisms...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27909706/out-of-plane-integration-of-a-multimode-optical-fiber-for-single-particle-cell-detection-at-multiple-points-on-a-microfluidic-device-with-applications-to-particle-cell-counting-velocimetry-size-discrimination-and-the-analysis-of-single-cell-lysate-injections
#11
Jalal Sadeghi, Damith E W Patabadige, Anne H Culbertson, Hamid Latifi, Christopher T Culbertson
In this paper a single particle/cell-tracking microfluidic device that integrates an out-of-plane multimode optical fiber (OP-MMF) is reported. This OP-MMF is used to generate three excitation light-lines and three detection spots using only one excitation source and one detector. It takes advantage of an optical tunneling mode to create two excitation lines in a microfluidic channel emanating from a single fiber end. This method was used to accurately count particles/cells and perform velocity measurements and size discrimination...
December 2, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27908783/lipid-peroxidation-in-face-of-dna-damage-dna-repair-and-other-cellular-processes
#12
Barbara Tudek, Daria Zdżalik-Bielecka, Agnieszka Tudek, Konrad Kosicki, Anna Fabisiewicz, Elżbieta Speina
Exocyclic adducts to DNA bases are formed as a consequence of exposure to certain environmental carcinogens as well as inflammation and lipid peroxidation (LPO). Complex family of LPO products gives rise to a variety of DNA adducts, which can be grouped in two classes: (i) small etheno-type adducts of strong mutagenic potential, and (ii) bulky, propano-type adducts, which block replication and transcription, and are lethal lesions. Etheno-DNA adducts are removed from the DNA by base excision repair (BER), AlkB and nucleotide incision repair enzymes (NIR), while substituted propano-type lesions by nucleotide excision repair (NER) and homologous recombination (HR)...
November 28, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27908641/free-energy-perturbation-calculation-of-relative-binding-free-energy-between-broadly-neutralizing-antibodies-and-the-gp120-glycoprotein-of-hiv-1
#13
Anthony J Clark, Tatyana Gindin, Baoshan Zhang, Lingle Wang, Robert Abel, Colleen S Murret, Fang Xu, Amy Bao, Nina J Lu, Tongqing Zhou, Peter D Kwong, Lawrence Shapiro, Barry Honig, Richard A Friesner
Direct calculation of relative binding affinities between antibodies and antigens is a long-sought goal. However, despite substantial efforts, no generally applicable computational method has been described. Here we describe a systematic free energy perturbation (FEP) protocol and calculate the binding affinities between the gp120 envelope glycoprotein of HIV-1 and three broadly neutralizing antibodies (bNAbs) of the VRC01 class. The protocol has been adapted from successful studies of small molecules to address the challenges associated with modeling protein-protein interactions...
November 28, 2016: Journal of Molecular Biology
https://www.readbyqxmd.com/read/27908252/the-combination-of-new-immunotherapy-and-radiotherapy-a-new-potential-treatment-for-locally-advanced-non-small-cell-lung-cancer
#14
Paola Claudia Sacco, Paolo Maione, Cesare Guida, Cesare Gridelli
Lung cancer is the main reason of cancer death worldwide. About 30% of non-small-cell lung cancer (NSCLC) cases are diagnosed with locally advanced disease (stage III). This is a mixed population including patients who have far more extensive and bulky disease than others. Management of these patients continue to be a challenge; frequently, patients have both local recurrence and distant metastases in this stage and the prognosis is very poor with a 5-year overall survival estimated between 3% and 7% for inoperable disease...
December 1, 2016: Current Clinical Pharmacology
https://www.readbyqxmd.com/read/27906478/activatable-photoacoustic-nanoprobes-for-in-vivo-ratiometric-imaging-of-peroxynitrite
#15
Jianjian Zhang, Xu Zhen, Paul Kumar Upputuri, Manojit Pramanik, Peng Chen, Kanyi Pu
Organic semiconducting nanoprobes doped with bulky borane can undergo specific activation by ONOO(-) even at tumor-relevant acidic pH (6.8), permitting in vivo ratiometric photoacoustic imaging of ONOO(-) in the tumor environment of living mice.
December 1, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27906476/alkyl-side-chain-engineering-in-wide-bandgap-copolymers-leading-to-power-conversion-efficiencies-over-10
#16
Tao Liu, Xuexue Pan, Xiangyi Meng, Yu Liu, Donghui Wei, Wei Ma, Lijun Huo, Xiaobo Sun, Tack Ho Lee, Minjuan Huang, Hyosung Choi, Jin Young Kim, Wallace C H Choy, Yanming Sun
A series of wide-bandgap (WBG) copolymers with different alkyl side chains are synthesized. Among them, copolymer PBT1-EH with moderatly bulky side chains on the acceptor unit shows the best photovoltaic performance with power conversion efficiency over 10%. The results suggest that the alkyl side-chain engineering is an effective strategy to further tuning the optoelectronic properties of WBG copolymers.
December 1, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27905612/bulky-4-6-disubstituted-tetraphenylethene-naphthalimide-dyad-synthesis-copolymerization-stimuli-responsive-fluorescence-and-cellular-imaging
#17
Qiong-Xin Hua, Bo Xin, Jun-Xia Liu, Ling-Xi Zhao, Zu-Jing Xiong, Tao Chen, Ze-Qiang Chen, Chong Li, Wen-Liang Gong, Zhen-Li Huang, Ming-Qiang Zhu
We report the design and synthesis of a tetraphenylethene substituted with naphthalimide at the 4, 6 positions, named NI-2TPE. NI-2TPE exhibits strong solvent-dependent emission properties with combined ICT and AIE characteristics in THF-H2O systems. This probe was used directly on test papers to distinguish normal organic solvents using their emission colours under UV light based on its AIE and ICT nature. Thanks to the vinyl group in NI-2TPE, we synthesized a copolymer of NIPAM and NI-2TPE, termed P(NIPAM-co-NI-2TPE)...
December 1, 2016: Faraday Discussions
https://www.readbyqxmd.com/read/27903409/synthesis-of-novel-substituted-pyrimidine-derivatives-bearing-a-sulfamide-group-and-their-in-vitro-cancer-growth-inhibition-activity
#18
Carole-Anne Lefebvre, Elsa Forcellini, Sophie Boutin, Marie-France Côté, René C-Gaudreault, Patrick Mathieu, Patrick Lagüe, Jean-François Paquin
The synthesis of two series of novel substituted pyrimidine derivatives bearing a sulfamide group have been described and their in vitro cancer growth inhibition activities have been evaluated against three human tumour cell lines (HT-29, M21, and MCF7). In general, growth inhibition activity has been enhanced by the introduction of a bulky substituent on the aromatic ring with the best compound having GI50<6μM for all the human tumour cell lines. The MCF7 selective compounds were evaluated on four additional human invasive breast ductal carcinoma cell lines (MDA-MB-231, MDA-MB-468, SKBR3, and T47D) and were selective against T47D cell line in all cases except one, suggesting a potential antiestrogen activity...
November 19, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27900486/staging-laparoscopy-for-advanced-gastric-cancer-significance-of-preoperative-clinicopathological-factors
#19
Hisahiro Hosogi, Hisashi Shinohara, Shigeru Tsunoda, Shigeo Hisamori, Hitoshi Sumida, Koya Hida, Kazutaka Obama, Hiroshi Okabe, Yoshiharu Sakai
PURPOSE: Although the use of staging laparoscopy (SL) for detecting peritoneal metastasis (P) and determining peritoneal lavage cytology (CY) is widespread in advanced gastric cancer, an indication for SL based on preoperative clinicopathological factors is controversial. METHODS: From May 2006 to September 2015, 120 patients with advanced gastric cancer with primary tumors ≥5 cm and/or with bulky regional lymph nodes (bulky N) underwent SL for assessment of P/CY status...
November 29, 2016: Langenbeck's Archives of Surgery
https://www.readbyqxmd.com/read/27897389/new-insights-into-the-difference-between-rotaxane-and-pseudorotaxane
#20
He-Lue Sun, Heng-Yi Zhang, Zhen Dai, Xu Han, Yu Liu
Rotaxane and pseudorotaxane are two sorts of different mechanically interlocked molecular architectures, and there is obvious topological difference and boundary between them. In this work, a "suggested [2]rotaxane 1α-CD" was constructed based on an axle molecule 1 bearing two terminal ferrocene groups and a wheel component α-cyclodextrin (α-CD), but the result obtained indicated that the ferrocene group cannot prevent α-CD dethreading under UV irradiation. That is, 1α-CD is just a pseudo[2]rotaxane...
November 29, 2016: Chemistry, An Asian Journal
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