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https://www.readbyqxmd.com/read/28810191/structure-function-studies-of-bpp-brachynh2-and-synthetic-analogues-thereof-with-angiotensin-i-converting-enzyme
#1
Daniel D R Arcanjo, Andreanne G Vasconcelos, Lucas A Nascimento, Ana Carolina Mafud, Alexandra Plácido, Michel M M Alves, Cristina Delerue-Matos, Marcelo P Bemquerer, Nuno Vale, Paula Gomes, Eduardo B Oliveira, Francisco C A Lima, Yvonne P Mascarenhas, Fernando Aécio A Carvalho, Ulf Simonsen, Ricardo M Ramos, José Roberto S A Leite
The vasoactive proline-rich oligopeptide termed BPP-BrachyNH2 (H-WPPPKVSP-NH2) induces in vitro inhibitory activity of angiotensin I-converting enzyme (ACE) in rat blood serum. In the present study, the removal of N-terminal tryptophan or C-terminal proline from BPP-BrachyNH2 was investigated in order to predict which structural components are important or required for interaction with ACE. Furthermore, the toxicological profile was assessed by in silico prediction and in vitro MTT assay. Two BPP-BrachyNH2 analogues (des-Trp(1)-BPP-BrachyNH2 and des-Pro(8)-BPP-BrachyNH2) were synthesized, and in vitro and in silico ACE inhibitory activity and toxicological profile were assessed...
August 7, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28782624/post-translational-modifications-of-the-mitochondrial-f1fo-atpase
#2
REVIEW
Salvatore Nesci, Fabiana Trombetti, Vittoria Ventrella, Alessandra Pagliarani
BACKGROUND: The mitochondrial F1FO-ATPase has the main role in synthesizing most of ATP, thus providing energy to living cells, but it also works in reverse and hydrolyzes ATP, depending on the transmembrane electrochemical gradient. Within the same complex the vital role of the enzyme of life coexists with that of molecular switch to trigger programmed cell death. The two-faced vital/lethal role makes the enzyme complex an intriguing biochemical target to fight pathogens resistant to traditional therapies and diseases linked to mitochondrial dysfunctions...
August 4, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28764371/toward-reliable-modeling-of-s-nitrosothiol-chemistry-structure-and-properties-of-methyl-thionitrite-ch3sno-an-s-nitrosocysteine-model
#3
Dmitry G Khomyakov, Qadir K Timerghazin
Methyl thionitrite CH3SNO is an important model of S-nitrosated cysteine aminoacid residue (CysNO), a ubiquitous biological S-nitrosothiol (RSNO) involved in numerous physiological processes. As such, CH3SNO can provide insights into the intrinsic properties of the -SNO group in CysNO, in particular, its weak and labile S-N bond. Here, we report an ab initio computational investigation of the structure and properties of CH3SNO using a composite Feller-Peterson-Dixon scheme based on the explicitly correlated coupled cluster with single, double, and perturbative triple excitations calculations extrapolated to the complete basis set limit, CCSD(T)-F12/CBS, with a number of additive corrections for the effects of quadruple excitations, core-valence correlation, scalar-relativistic and spin-orbit effects, as well as harmonic zero-point vibrational energy with an anharmonicity correction...
July 28, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28761155/spatial-structure-of-tlr4-transmembrane-domain-in-bicelles-provides-the-insight-into-the-receptor-activation-mechanism
#4
Konstantin S Mineev, Sergey A Goncharuk, Marina V Goncharuk, Pavel E Volynsky, Ekaterina V Novikova, Alexander S Aresinev
Toll-like receptors (TLRs) play a key role in the innate and adaptive immune systems. While a lot of structural data is available for the extracellular and cytoplasmic domains of TLRs, and a model of the dimeric full-length TLR3 receptor in the active state was build, the conformation of the transmembrane (TM) domain and juxtamembrane regions in TLR dimers is still unclear. In the present work, we study the transmembrane and juxtamembrane parts of human TLR4 receptor using solution NMR spectroscopy in a variety of membrane mimetics, including phospholipid bicelles...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28753930/pregnancy-proteinuria-plant-based-supplemented-diets-and-focal-segmental-glomerulosclerosis-a-report-on-three-cases-and-critical-appraisal-of-the-literature
#5
Rossella Attini, Filomena Leone, Benedetta Montersino, Federica Fassio, Fosca Minelli, Loredana Colla, Maura Rossetti, Cristiana Rollino, Maria Grazia Alemanno, Antonella Barreca, Tullia Todros, Giorgina Barbara Piccoli
Chronic kidney disease (CKD) is increasingly recognized in pregnant patients. Three characteristics are associated with a risk of preterm delivery or small for gestational age babies; kidney function reduction, hypertension, and proteinuria. In pregnancy, the anti-proteinuric agents (ACE-angiotensin converting enzyme-inhibitors or ARBS -angiotensin receptor blockers) have to be discontinued for their potential teratogenicity, and there is no validated approach to control proteinuria. Furthermore, proteinuria usually increases as an effect of therapeutic changes and pregnancy-induced hyperfiltration...
July 19, 2017: Nutrients
https://www.readbyqxmd.com/read/28739325/d242n-a-kv7-1-lqts-mutation-uncovers-a-key-residue-for-iks-voltage-dependence
#6
Cristina Moreno, Anna Oliveras, Chiara Bartolucci, Carmen Muñoz, Alicia de la Cruz, Diego A Peraza, Juan R Gimeno, Mercedes Martín-Martínez, Stefano Severi, Antonio Felipe, Pier D Lambiase, Teresa Gonzalez, Carmen Valenzuela
KV7.1 and KCNE1 co-assemble to give rise to the IKs current, one of the most important repolarizing currents of the cardiac action potential. Its relevance is underscored by the identification of >500 mutations in KV7.1 and, at least, 36 in KCNE1, that cause Long QT Syndrome (LQTS). The aim of this study was to characterize the biophysical and cellular consequences of the D242N KV7.1 mutation associated with the LQTS. The mutation is located in the S4 transmembrane segment, within the voltage sensor of the KV7...
July 22, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28739271/purification-of-dirucotide-a-synthetic-17-aminoacid-peptide-by-ion-exchange-centrifugal-partition-chromatography
#7
Leslie Boudesocque, Luciano Forni, Agathe Martinez, Jean-Marc Nuzillard, Matthieu Giraud, Jean-Hugues Renault
Dirucotide is a synthetic drug candidate for the treatment of multiple sclerosis. This 17-aminoacid peptide was successfully purified by ion exchange centrifugal partition chromatography. The optimized conditions involved the biphasic methyl tert-butyl ether/acetonitrile/n-butanol/water (2:1:2:5, v/v) solvent system in the descending mode, the di(2-ethylhexyl)phosphoric acid cation-exchanger with an exchanger (di(2-ethylhexyl)phosphoric acid)/dirucotide mole ratio of 100 and Ca(2+) ions in aqueous solution as displacer...
July 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28738195/proteomic-and-genetics-insights-on-the-response-of-the-bacteriocinogenic-lactobacillus-sakei-crl1862-during-biofilm-formation-on-stainless-steel-surface-at-10%C3%A2-c
#8
Mariana Pérez-Ibarreche, Lucía M Mendoza, Graciela Vignolo, Silvina Fadda
Some lactic acid bacteria have the ability to form biofilms on food-industry surfaces and this property could be used to control food pathogens colonization. Lactobacillus sakei CR1862 was selected considering its bacteriocinogenic nature and ability to adhere to abiotic surfaces at low temperatures. In this study, the proteome of L. sakei CRL1862 grown either under biofilm on stainless steel surface and planktonic modes of growth at 10°C, was investigated. Using two-dimensional gel electrophoresis, 29 out of 43 statistically significant spots were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry...
July 4, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28737896/interfacial-shear-strength-and-adhesive-behavior-of-silk-ionomer-surfaces
#9
Sunghan Kim, Ren D Geryak, Shuaidi Zhang, Ruilong Ma, Rossella Calabrese, David L Kaplan, Vladimir V Tsukruk
The interfacial shear strength between different layers in multilayered structures of layer-by-layer (LbL) microcapsules is a crucial mechanical property to ensure their robustness. In this work, we investigated the interfacial shear strength of modified silk fibroin ionomers utilized in LbL shells, an ionic-cationic pair with complementary ionic pairing, (SF)-poly-l-glutamic acid (Glu) and SF-poly-l-lysine (Lys), and a complementary pair with partially screened Coulombic interactions due to the presence of poly(ethylene glycol) (PEG) segments and SF-Glu/SF-Lys[PEG] pair...
August 4, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28702021/combination-of-metabolomic-and-proteomic-analysis-revealed-different-features-among-lactobacillus-delbrueckii-subspecies-bulgaricus-and-lactis-strains-while-in-vivo-testing-in-the-model-organism-caenorhabditis-elegans-highlighted-probiotic-properties
#10
Elena Zanni, Emily Schifano, Sara Motta, Fabio Sciubba, Claudio Palleschi, Pierluigi Mauri, Giuditta Perozzi, Daniela Uccelletti, Chiara Devirgiliis, Alfredo Miccheli
Lactobacillus delbrueckii represents a technologically relevant member of lactic acid bacteria, since the two subspecies bulgaricus and lactis are widely associated with fermented dairy products. In the present work, we report the characterization of two commercial strains belonging to L. delbrueckii subspecies bulgaricus, lactis and a novel strain previously isolated from a traditional fermented fresh cheese. A phenomic approach was performed by combining metabolomic and proteomic analysis of the three strains, which were subsequently supplemented as food source to the model organism Caenorhabditis elegans, with the final aim to evaluate their possible probiotic effects...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28664835/prevalence-and-significance-of-anti-saccharomyces-cerevisiae-antibodies-in-primary-sj%C3%A3-gren-s-syndrome
#11
Alessia Alunno, Onelia Bistoni, Francesco Carubbi, Valentina Valentini, Giacomo Cafaro, Elena Bartoloni Bocci, Roberto Giacomelli, Roberto Gerli
OBJECTIVES: Saccharomyces cerevisiae is a common yeast used in the food industry. IgG and IgA antibodies against the phosphopeptidomannan of the S. cerevisiae cell wall (ASCA) are a well known marker of disease severity in Crohn's disease. Moreover, a number of studies assessed ASCA in several systemic and organ-specific autoimmune diseases postulating molecular mimicry as a possible link between ASCA and autoimmunity. However, since they have never been tested in primary Sjögren's syndrome (pSS), the purpose of this study was to investigate these antibodies in a large cohort of pSS patients, compared to healthy donors (HD), and their significance as potentially helpful biomarker in a clinical setting...
June 29, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28663197/the-subcellular-distribution-of-hdac1-in-neurotoxic-conditions-is-dependent-on-serine-phosphorylation
#12
Yunjiao Zhu, Oscar G Vidaurre, Kadidia P Adula, Nebojsa Kezunovic, Maureen Wentling, George W Huntley, Patrizia Casaccia
Calcium-dependent nuclear export of HDAC1 was previously shown to precede axonal damage in culture, but the in vivo relevance of these findings and the potential post-translational modifications of HDAC1 remained elusive. Using acute hippocampal slices from mice of either sex, with genetic conditional ablation of Hdac1 in CA1 hippocampal neurons (i.e. Camk2a-cre;Hdac1(fl/fl) ), we show significantly diminished axonal damage in response to neurotoxic stimuli. The protective effect of Hdac1 ablation was detected also in CA3 neurons in Grik4-cre;Hdac1(fl/f) mice, that were more resistant to the excitotoxic damage induced by intraventricular injection of kainic acid...
June 29, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28652626/deformation-pattern-in-vibrating-microtubule-structural-mechanics-study-based-on-an-atomistic-approach
#13
Daniel Havelka, Marco A Deriu, Michal Cifra, Ondřej Kučera
The mechanical properties of microtubules are of great importance for understanding their biological function and for applications in artificial devices. Although microtubule mechanics has been extensively studied both theoretically and experimentally, the relation to its molecular structure is understood only partially. Here, we report on the structural analysis of microtubule vibration modes calculated by an atomistic approach. Molecular dynamics was applied to refine the atomic structure of a microtubule and a C α elastic network model was analyzed for its normal modes...
June 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642124/identification-of-genetic-variants-associated-with-huntington-s-disease-progression-a-genome-wide-association-study
#14
Davina J Hensman Moss, Antonio F Pardiñas, Douglas Langbehn, Kitty Lo, Blair R Leavitt, Raymund Roos, Alexandra Durr, Simon Mead, Peter Holmans, Lesley Jones, Sarah J Tabrizi
BACKGROUND: Huntington's disease is caused by a CAG repeat expansion in the huntingtin gene, HTT. Age at onset has been used as a quantitative phenotype in genetic analysis looking for Huntington's disease modifiers, but is hard to define and not always available. Therefore, we aimed to generate a novel measure of disease progression and to identify genetic markers associated with this progression measure. METHODS: We generated a progression score on the basis of principal component analysis of prospectively acquired longitudinal changes in motor, cognitive, and imaging measures in the 218 indivduals in the TRACK-HD cohort of Huntington's disease gene mutation carriers (data collected 2008-11)...
June 20, 2017: Lancet Neurology
https://www.readbyqxmd.com/read/28634584/effect-of-chitosan-edible-coating-on-the-biochemical-and-physical-characteristics-of-carp-fillet-cyprinus-carpio-stored-at-18%C3%A2-c
#15
Ana Gabriela Morachis-Valdez, Leobardo Manuel Gómez-Oliván, Imelda García-Argueta, María Dolores Hernández-Navarro, Daniel Díaz-Bandera, Octavio Dublán-García
The effect of an edible coating (EC) with 1.5% chitosan as an additive, on common carp (Cyprinus carpio) fillet, was determined evaluating the biochemical, physicochemical, textural, microbiological, and nutritional characteristics periodically during its storage in the freezer (-18°C), observing a decrease in the rate of biochemical reactions related to degradation (p < 0.05), hydroperoxides content (HPC) (0.8324 nM hydroperoxides/mg of protein versus 0.5540 nM/mg with regard to the EC sample), as well as protein carbonyl content (PCC) (0...
2017: International journal of food science
https://www.readbyqxmd.com/read/28600889/a-novel-versatile-precursor-suitable-for-18-f-radiolabelling-via-click-chemistry
#16
B Lugato, S Stucchi, S Ciceri, M N Iannone, E A Turolla, L Giuliano, C Chinello, S Todde, P Ferraboschi
As an effort to improve (18) F radiolabelling of biomolecules in terms of method robustness and versatility, we report the synthesis and radiolabelling of a new azido precursor potentially useful for the so called "click-reaction", in particular the ligand-free version of the copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC). The new azido precursor may help to overcome problems sometimes exhibited by most of the currently used analogues, as it is safe to handle and it displays long term chemical stability, thus facilitating the development of new radiolabelling procedures...
June 10, 2017: Journal of Labelled Compounds & Radiopharmaceuticals
https://www.readbyqxmd.com/read/28595386/solvent-induced-molecular-folding-and-self-assembled-nanostructures-of-tyrosine-and-tryptophan-analogues-in-aqueous-solution-fascinating-morphology-of-high-order
#17
Gulmi Chakraborty, Madhurima Paul Chowdhury, Swapan K Saha
Hydrophobic derivatives of tyrosine and tryptophan, viz. octyl and dodecyl esters of tyrosine and octyl ester of tryptophan, are synthesized, and the interfacial and bulk properties in aqueous media are investigated as models for the membrane proteins. Molecular modeling by the density functional theory method is carried out to understand the molecular conformation and geometry for the purpose of determining the packing parameters. Water-induced molecular folding of the esters of both tyrosine and tryptophan, as observed using rotating frame nuclear Overhauser effect spectroscopy, indicates that the segregation of the hydrophobic and hydrophilic blocks in water is the key to the development of fascinating interfacial property displayed by the aromatic amino acid esters...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28584450/t-cell-epitopes-predicted-from-the-nucleocapsid-protein-of-sin-nombre-virus-restricted-to-30-hla-alleles-common-to-the-north-american-population
#18
Sathish Sankar, Mageshbabu Ramamurthy, Balaji Nandagopal, Gopalan Sridharan
Hantavirus cardiopulmonary syndrome in North America is caused by Sin Nombre virus (SNV) and poses a public health problem. We identified T-cell epitopes restricted to HLA alleles commonly seen in the N. American population. Nucleocapsid (N) protein is 428 aminoacid in length and binds to RNA and functions also as a key molecule between virus and host cell processes. The predicted epitopes from N protein that bind to class I MHC were analyzed for human proteasomes cleavage, TAP efficiency, immunogenicity and antigenicity...
2017: Bioinformation
https://www.readbyqxmd.com/read/28566078/-determination-of-drug-resistance-mutations-of-ns3-inhibitors-in-chronic-hepatitis-c-patients-infected-with-genotype-1
#19
Tamer Şanlıdağ, Murat Sayan, Sinem Akçalı, Elmas Kasap, Tahir Buran, Ayşe Arıkan
Direct-acting antiviral agents (DAA) such as NS3 protease inhibitors is the first class of drugs used for chronic hepatitis C (CHC) treatment. NS3 inhibitors (PI) with low genetic barrier have been approved to be used in the CHC genotype 1 infections, and in the treatment of compensated liver disease including cirrhosis together with pegile interferon and ribavirin. Consequently, the development of drug resistance during DAA treatment of CHC is a major problem. NS3 resistant variants can be detected before treatment as they can occurnaturally...
April 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/28562359/blockage-of-foxp3-transcription-factor-dimerization-and-foxp3-aml1-interaction-inhibits-t-regulatory-cell-activity-sequence-optimization-of-a-peptide-inhibitor
#20
Teresa Lozano, Marta Gorraiz, Aritz Lasarte-Cía, Marta Ruiz, Obdulia Rabal, Julen Oyarzabal, Sandra Hervás-Stubbs, Diana Llopiz, Pablo Sarobe, Jesús Prieto, Noelia Casares, Juan José Lasarte
Although T regulatory cells (Treg) are essential for the prevention of autoimmune diseases, their immunoregulatory function restrains the induction of immune responses against cancer. Thus, development of inhibitors of FOXP3, a key transcription factor for the immunosuppressive activity of Treg, might give new therapeutic opportunities. In a previous work we identified a peptide (named P60) able to enter into the cells, bind to FOXP3, and impair Treg activity in vitro and in vivo. Here we show that P60 binds to the intermediate region of FOXP3 and inhibits its homodimerization as well as its interaction with the transcription factor AML1...
May 13, 2017: Oncotarget
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