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https://www.readbyqxmd.com/read/29143058/membrane-environment-drives-cytochrome-p450-s-spin-transition-and-its-interaction-with-cytochrome-b5
#1
Thirupathi Ravula, Carlo Barnaba, Mukesh Mahajan, G M Anantharamaiah, Sang-Choul Im, Lucy Waskell, Ayyalusamy Ramamoorthy
Heme's spin-multiplicity is key in determining the enzymatic function of cytochrome P450 (cytP450). The origin of the low-spin state in ferric P450 is still under debate. Here, we report the first experimental demonstration of P450's membrane interaction altering its spin equilibrium which is accompanied by a stronger affinity for cytochrome b5. These results highlight the importance of lipid membrane for the function of P450.
November 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29138027/imidazo-1-2-a-pyridines-linked-with-thiazoles-thiophene-motif-through-keto-spacer-as-potential-cytotoxic-agents-and-nf-%C3%AE%C2%BAb-inhibitors
#2
Kamala K Vasu, Chander Singh Digwal, Amit N Pandya, Dhaivat H Pandya, Jayesh A Sharma, Sneha Patel, Milee Agarwal
A series of new imidazo[1,2-a]pyridine linked with thiazole/thiophene motif through a keto spacer were synthesized and tested for their cytotoxic potential against three human cancer cell lines including A549, HeLa and U87-MG using MTT assay. Compounds A2, A3, A4, C1 and C2 showed cytotoxicity against all the three cell lines. The selectivity index for compound A4 for A549 and HeLa cells was comparable to that of doxorubicin. Among the synthesized compounds, B5 showed the maximum inhibition of NF-κB activity as ascertained by NF-κB reporter assay (IC50 = 6...
November 11, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29134337/recombination-analysis-of-coxsackievirus-b5-genogroup-c
#3
Hongxing Shen
Coxsackievirus B5 (CVB5) is a member of the species Enterovirus B of the genus Enterovirus, family Picornaviridae. Based on its VP1 sequence, CVB5 is divided into four genogroups: A, B, C, and D. From 2002 to 2012, CVB5 serotype genogroup C caused an outbreak of aseptic meningitis in China. In order to study the evolution of CVB5 genogroup C, phylogenetic and recombination analysis was performed using the 399 available enterovirus B genome sequences in the GenBank database. The results indicated that 10 strains of CVB5 serotype genogroup C resulted from recombination between members of genogroup B and echovirus serotype E6, and another 5 strains resulted from recombination between members of genogroup C and serotype CVB4...
November 13, 2017: Archives of Virology
https://www.readbyqxmd.com/read/29129284/the-b-vitamin-nutrition-of-insects-the-contributions-of-diet-microbiome-and-horizontally-acquired-genes
#4
REVIEW
Angela E Douglas
Insects generally cannot synthesize eight B vitamins that function as co-enzymes in various required enzymatic reactions. Most insects derive their B vitamin requirements from the diet, microbial symbionts, or a combination of these complementary sources. Exceptionally, the genomes of a few insects bear genes in vitamin B5 (pantothenate) and B7 (biotin) synthesis, horizontally acquired from bacteria. Biomarkers of B vitamin deficiency (e.g. vitamin titers, activity of vitamin-dependent enzymes) offer routes to investigate the incidence and the physiological and fitness consequences of B vitamin deficiency in laboratory and field populations of insects...
October 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/29116035/characterization-of-trichococcus-paludicola-sp-nov-and-trichococcus-alkaliphilus-sp-nov-isolated-from-a-high-elevation-wetland-by-phenotypic-and-genomic-analyses
#5
Yu-Mei Dai, Ling-Li Zhang, Yan Li, Yu-Qian Li, Xiao-Hui Deng, Ting-Ting Wang, Feng Yang, Yong-Qiang Tian, Na Li, Xing-Mei Zhou, Xiao-Feng Liu, Wen-Jun Li
Two psychrotolerant facultative anaerobes, strains B7-2(T) and B5(T), were isolated from the Zoige Wetland on the Qinghai-Tibetan Plateau. The 16S rRNA gene sequences of strains B7-2(T) and B5(T) shared high similarity (>99 %) with those of the type strains of the genus Trichococcus, while their digital DNA-DNA hybridization values with each other (49 %) and with the reference type strains (48-23 %) were lower than 70 %, which suggest that they represent two novel species of the genus Trichococcus...
November 8, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29113809/mir21-drives-resistance-to-heat-shock-protein-90-inhibition-in-cholangiocarcinoma
#6
Andrea Lampis, Pietro Carotenuto, Georgios Vlachogiannis, Luciano Cascione, Somaieh Hedayat, Rosemary Burke, Paul Clarke, Else Bosma, Michele Simbolo, Aldo Scarpa, Sijia Yu, Rebecca Cole, Elizabeth Smyth, Javier Fernández Mateos, Ruwaida Begum, Blanka Hezelova, Zakaria Eltahir, Andrew Wotherspoon, Nicos Fotiadis, Maria Antonietta Bali, Chirag Nepal, Khurum Khan, Mark Stubbs, Jens C Hahne, Pierluigi Gasparini, Vincenza Guzzardo, Carlo M Croce, Suzanne Eccles, Matteo Fassan, David Cunningham, Jesper B Andersen, Paul Workman, Nicola Valeri, Chiara Braconi
BACKGROUND & AIMS: Cholangiocarcinomas (CCA) are resistant to chemotherapy, so new therapeutic agents are needed. We performed a screen to identify small molecule compounds that are active against CCAs. Levels of microRNA 21 (MIR21 or miRNA21) are increased in CCAs. We investigated whether miRNA21 mediates resistance of CCA cells and organoids to HSP90 inhibitors. METHODS: We performed a high-throughput screen of 484 small molecule compounds to identify those that reduced viability of 6 human CCA cell lines...
November 4, 2017: Gastroenterology
https://www.readbyqxmd.com/read/29111436/topography-of-human-cytochrome-b5-cytochrome-b5-reductase-interacting-domain-and-redox-alterations-upon-complex-formation
#7
Alejandro K Samhan-Arias, Rui M Almeida, Susana Ramos, Cristina M Cordas, Isabel Moura, Carlos Gutierrez-Merino, José J G Moura
Cytochrome b5 is the main electron acceptor of cytochrome b5 reductase. The interacting domain between both human proteins has been unidentified up to date and very little is known about its redox properties modulation upon complex formation. In this article, we characterized the protein/protein interacting interface by solution NMR and molecular docking. In addition, upon complex formation, we measured an increase of cytochrome b5 reductase flavin autofluorescence that was dependent upon the presence of cytochrome b5...
October 28, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29107177/efficiency-of-the-sulfate-pathway-in-comparison-to-the-%C3%AE-4-and-%C3%AE-5-pathway-of-steroidogenesis-in-the-porcine-testis
#8
M C Klymiuk, J Neunzig, R Bernhardt, A Sánchez-Guijo, M F Hartmann, S A Wudy, G Schuler
Sulfonated steroids are increasingly recognized as a circulating reservoir of precursors for the local production of active steroids in certain target tissues. As an alternative to sulfonation of unconjugated steroids by cytosolic sulfotransferases, their direct formation from sulfonated precursors has been described. However, productivity and physiological relevance of this sulfate pathway of steroidogenesis are still widely unclear. Applying the porcine testis as a model, conversion of pregnenolone sulfate (P5S, sulfate pathway) by CYP17A1 was assessed in comparison to the parallel conversions of pregnenolone (P5, Δ5-pathway) and progesterone (P4, Δ4-pathway)...
October 26, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29105009/the-effect-of-the-ktp-laser-on-smear-layer-and-temperature-change-an-in-vitro-study
#9
Dilara Arslan, Alper Kuştarcı
The purpose of this study was to evaluate the effects of potassium-titanyl-phosphate (KTP) laser irradiation on smear layer removal and temperature changes of the root surfaces. Two hundred four extracted single-root human premolars were included. The canals were instrumented and divided into two main groups: group A (smear layer examination n:119) and group B (temperature change examination n:85). Each group was divided into subgroups (n:17) according to the different five laser power settings: A1, B1: 1 W-5...
November 6, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29104319/cytochrome-b5-plays-a-dual-role-in-the-reaction-cycle-of-cytochrome-p450-3a4-during-oxidation-of-the-anticancer-drug-ellipticine
#10
Marie Stiborová, Radek Indra, Eva Frei, Kateřina Kopečková, Heinz H Schmeiser, Tomáš Eckschlager, Vojtěch Adam, Zbyněk Heger, Volker M Arlt, Václav Martínek
Abstract: Ellipticine is an anticancer agent that forms covalent DNA adducts after enzymatic activation by cytochrome P450 (CYP) enzymes, mainly by CYP3A4. This process is one of the most important ellipticine DNA-damaging mechanisms for its antitumor action. Here, we investigated the efficiencies of human hepatic microsomes and human recombinant CYP3A4 expressed with its reductase, NADPH:CYP oxidoreductase (POR), NADH:cytochrome b5 reductase and/or cytochrome b5 in Supersomes™ to oxidize this drug...
2017: Monatshefte Für Chemie
https://www.readbyqxmd.com/read/29104317/comparison-of-human-cytochrome-p450-1a1-catalysed-oxidation-of-benzo-a-pyrene-in-prokaryotic-and-eukaryotic-expression-systems
#11
Marie Stiborová, Radek Indra, Michaela Moserová, Lucie Bořek-Dohalská, Petr Hodek, Eva Frei, Klaus Kopka, Heinz H Schmeiser, Volker M Arlt
Abstract: Cytochrome P450 (CYP) 1A1 is the most important enzyme activating and detoxifying the human carcinogen benzo[a]pyrene (BaP). In the previous studies, we had shown that not only the canonic NADPH:CYP oxidoreductase (POR) can act as electron donor but also cytochrome b5 and its reductase, NADH:cytochrome b5 reductase. Here, we studied the role of the expression system used on the metabolites generated and the levels of DNA adducts formed by activated BaP. We used an eukaryotic and a prokaryotic cellular system (Supersomes, microsomes isolated from insect cells, and Bactosomes, a membrane fraction of Escherichia coli, each transfected with cDNA of human CYP1A1 and POR)...
2017: Monatshefte Für Chemie
https://www.readbyqxmd.com/read/29102628/dietary-supplementation-of-biofloc-influences-growth-performance-physiological-stress-antioxidant-status-and-immune-response-of-juvenile-sea-cucumber-apostichopus-japonicus-selenka
#12
Jinghua Chen, Yichao Ren, Guodong Wang, Bin Xia, Yuquan Li
Bioflocs are rich in various probiotics and bioactive compounds, which play an important role in improving growth and health status of aquatic organisms. A 60-day experiment was conducted to investigate the effects of dietary supplementation of biofloc on growth performance, digestive enzyme activity, physiological stress, antioxidant status, expression of immune-related genes and disease resistance of sea cucumber Apostichopus japonicus. Juvenile sea cucumbers were fed five experimental diets containing graded levels of biofloc from 0% to 20% (referred as B0, B5, B10, B15 and B20, respectively)...
November 4, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29079577/structural-and-functional-effects-of-cytochrome-b5-interactions-with-human-cytochrome-p450-enzymes
#13
Aaron G Bart, Emily E Scott
The small heme-containing protein cytochrome b5 can facilitate, inhibit, or have no effect on cytochrome P450 catalysis, often in a P450-dependent and substrate-dependent manner that is not well understood. Herein solution NMR was used to identify b5 residues interacting with different human drug-metabolizing P450 enzymes. NMR results revealed that P450 enzymes bound to either b5 α4-5 (CYP2A6 and CYP2E1) or this region and α2-3 (CYP2D6 and CYP3A4) and suggested variation in the affinity for b5 Mutations of key b5 residues suggest that not only are different b5 surfaces responsible for binding different P450 enzymes, but that these different complexes are relevant to the observed effects on P450 catalysis...
October 27, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29075248/the-exometabolome-of-two-model-strains-of-the-roseobacter-group-a-marketplace-of-microbial-metabolites
#14
Gerrit Wienhausen, Beatriz E Noriega-Ortega, Jutta Niggemann, Thorsten Dittmar, Meinhard Simon
Recent studies applying Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) showed that the exometabolome of marine bacteria is composed of a surprisingly high molecular diversity. To shed more light on how this diversity is generated we examined the exometabolome of two model strains of the Roseobacter group, Phaeobacter inhibens and Dinoroseobacter shibae, grown on glutamate, glucose, acetate or succinate by FT-ICR-MS. We detected 2,767 and 3,354 molecular formulas in the exometabolome of each strain and 67 and 84 matched genome-predicted metabolites of P...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29072765/the-cytochrome-b5-cybe-is-regulated-by-iron-availability-and-is-crucial-for-azole-resistance-in-a-fumigatus
#15
Matthias Misslinger, Fabio Gsaller, Peter Hortschansky, Christoph Müller, Franz Bracher, Michael J Bromley, Hubertus Haas
Cytochrome P450 enzymes (P450) play essential roles in redox metabolism in all domains of life including detoxification reactions and sterol biosynthesis. The activity of P450s is fuelled by two electron-transferring mechanisms, heme-independent P450 reductase (CPR) and the heme-dependent cytochrome b5 (CYB5)/cytochrome b5 reductase (CB5R) system. In this study, we characterised the role and regulation of the cytochrome b5 CybE in the fungal pathogen Aspergillus fumigatus. Deletion of the CybE encoding gene (cybE) caused a severe growth defect in two different A...
November 15, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29059468/hepatitis-b-virus-sensitivity-to-interferon-%C3%AE-in-hepatocytes-is-more-associated-with-cellular-interferon-response-than-with-viral-genotype
#16
Fang Shen, Yaming Li, Yang Wang, Vitina Sozzi, Peter A Revill, Jiangxia Liu, Lu Gao, Guang Yang, Mengji Lu, Kathrin Sutter, Ulf Dittmer, Jieliang Chen, Zhenghong Yuan
Interferon-α (IFN-α) is used to treat chronic HBV infection but only 20-40% of patients respond well. Clinical observations have suggested that HBV genotype is associated with the response to IFN therapy, however, its role in viral responsiveness to IFN in HBV-infected hepatocytes remain unclear. Here, we produced infectious virions of HBV genotypes A to D to infect three well-recognized cell culture-based HBV infection systems including primary human hepatocytes (PHH), differentiated HepaRG (dHepaRG) and HepG2-NTCP cells to quantitatively compare the antiviral effect of IFN-α on HBV across genotypes and cell models...
October 23, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29059353/leucocyte-immunoglobulin-like-receptor-subfamily-b5-lilrb5-genetic-variation-and-statin-associated-muscle-symptoms-another-piece-in-a-puzzling-puzzle
#17
Winfried März, Ulrich Laufs
No abstract text is available yet for this article.
October 20, 2017: European Heart Journal
https://www.readbyqxmd.com/read/29049009/seroepidemiology-of-coxsackievirus-b5-in-infants-and-children-in-jiangsu-province-china
#18
Fan Gao, Lianlian Bian, Xiaotian Hao, Yalin Hu, Xin Yao, Shiyang Sun, Pan Chen, Ce Yang, Ruixiao Du, Jingxin Li, Fengcai Zhu, Qunying Mao, Zhenglun Liang
Coxsackievirus B5 (CV-B5) is associated with various human diseases such as viral encephalitis, aseptic meningitis, paralysis, herpangina, and hand, foot and mouth disease (HFMD). However, there is currently no effective vaccine against CV-B5.The seroepidemiologic characteristics of CV-B5 remained unknown. A cohort study was carried out in 176 participants aged 6-35 months from January 2012 to January 2014. The serum samples were collected and tested for CV-B5 neutralizing antibodies (NtAbs) four times during these two years...
October 19, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/29048336/proanthocyanidin-characterization-antioxidant-and-cytotoxic-activities-of-three-plants-commonly-used-in-traditional-medicine-in-costa-rica-petiveria-alliaceae-l-phyllanthus-niruri-l-and-senna-reticulata-willd
#19
Mirtha Navarro, Ileana Moreira, Elizabeth Arnaez, Silvia Quesada, Gabriela Azofeifa, Diego Alvarado, Maria J Monagas
The phenolic composition of aerial parts from Petiveria alliaceae L., Phyllanthus niruri L. and Senna reticulata Willd., species commonly used in Costa Rica as traditional medicines, was studied using UPLC-ESI-TQ-MS on enriched-phenolic extracts. Comparatively, higher values of total phenolic content (TPC), as measured by the Folin-Ciocalteau method, were observed for P. niruri extracts (328.8 gallic acid equivalents/g) than for S. reticulata (79.30 gallic acid equivalents/g) whereas P. alliaceae extract showed the lowest value (13...
October 19, 2017: Plants (Basel, Switzerland)
https://www.readbyqxmd.com/read/29042074/stereotactic-vacuum-assisted-breast-biopsy-comparison-between-11-and-8-gauge-needles
#20
Irene Ruggirello, Jacopo Nori, Isacco Desideri, Calogero Saieva, Elisabetta Giannotti, Giulia Bicchierai, Diego De Benedetto, Giulio Francolini, Simonetta Bianchi, Vania Vezzosi, Luis Sanchez, Tommaso Susini, Lorenzo Orzalesi, Icro Meattini, Lorenzo Livi, Vittorio Miele
PURPOSE: The 11-gauge (11G) stereotactic vacuum-assisted breast biopsy (VABB) showed a better profile than 14G-VABB in terms of feasibility, safety, microcalcification sampling, and accuracy. Underestimation rates were significantly lower with 11G-VABB than with 14G-VABB. Thus, the introduction of an even larger needle at the VABB procedure could reduce this rate further. The purpose of this study was to compare the overall performance of stereotactic VABB with 8G and 11G needles. MATERIALS AND METHODS: Four hundred and three VABBs performed between July 2012 and February 2015 at the Breast Diagnostic Unit of Careggi Hospital in Florence were retrospectively analyzed; 197 were performed with 11G-VABB and 206 with 8G-VABB...
October 6, 2017: European Journal of Surgical Oncology
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