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https://www.readbyqxmd.com/read/28334946/mutations-affecting-the-transmembrane-domain-of-the-ldl-receptor-impact-of-charged-residues-on-the-membrane-insertion
#1
Thea Bismo Strøm, Jon K Laerdahl, Trond P Leren
Familial hypercholesterolemia (FH) is caused by mutations in the low density lipoprotein receptor (LDLR) gene. To study the impact of mutations affecting the hydrophobic transmembrane domain of the LDLR, each of the 22 amino acids of the transmembrane domain was individually mutated to arginine. The more centrally in the transmembrane domain an arginine was located, the lower amounts of the 120 kDa precursor LDLR in the endoplasmic reticulum were observed. This led to lower amounts of the 160 kDa mature LDLR on the cell surface...
February 22, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28334903/n6-methyladenosine-alters-rna-structure-to-regulate-binding-of-a-low-complexity-protein
#2
Nian Liu, Katherine I Zhou, Marc Parisien, Qing Dai, Luda Diatchenko, Tao Pan
N6-methyladenosine (m6A) is the most abundant internal modification in eukaryotic messenger RNA (mRNA), and affects almost every stage of the mRNA life cycle. The YTH-domain proteins can specifically recognize m6A modification to control mRNA maturation, translation and decay. m6A can also alter RNA structures to affect RNA-protein interactions in cells. Here, we show that m6A increases the accessibility of its surrounding RNA sequence to bind heterogeneous nuclear ribonucleoprotein G (HNRNPG). Furthermore, HNRNPG binds m6A-methylated RNAs through its C-terminal low-complexity region, which self-assembles into large particles in vitro...
February 25, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28333783/dome-shaped-macula-in-myopic-eyes-twelve-month-follow-up
#3
Daniel Lorenzo, Luis Arias, Netan Choudhry, Eduard Millan, Ignacio Flores, Marcos J Rubio, Estefanía Cobos, Pere García-Bru, Alejandro Filloy, Josep M Caminal
PURPOSE: To study the long-term clinical course of dome-shaped macula in myopic eyes and to evaluate treatment efficacy for subretinal fluid (SRF) as a related complication. METHODS: A retrospective, single-center consecutive case series study was conducted. The authors analyzed myopic eyes with dome-shaped macula in patients who presented for evaluation of decreased vision. Dome-shaped macula was defined as a convexity of the retina-choroidal macular complex seen on spectral domain optical coherence tomography images...
April 2017: Retina
https://www.readbyqxmd.com/read/28328011/when-emotional-pain-becomes-physical-adverse-childhood-experiences-pain-and-the-role-of-mood-and-anxiety-disorders
#4
Natalie J Sachs-Ericsson, Julia L Sheffler, Ian H Stanley, Jennifer R Piazza, Kristopher J Preacher
OBJECTIVE: We examined the association between retrospective reports of adverse childhood experiences (ACEs) and painful medical conditions. We also examined the mediating and moderating roles of mood and anxiety disorders in the ACEs-painful medical conditions relationship. METHOD: Ten-year longitudinal data were obtained from the National Comorbidity Surveys (NCS-1, NCS-2; N = 5001). The NCS-1 obtained reports of ACEs, current health conditions, current pain severity, and mood and anxiety disorders...
March 22, 2017: Journal of Clinical Psychology
https://www.readbyqxmd.com/read/28319173/affinity-purification-of-human-m-calpain-through-an-intrinsically-disordered-inhibitor-calpastatin
#5
Hung Huy Nguyen, Mihaly Varadi, Peter Tompa, Kris Pauwels
Calpains are calcium-activated proteases that have biomedical and biotechnological potential. Their activity is tightly regulated by their endogenous inhibitor, calpastatin that binds to the enzyme only in the presence of calcium. Conventional approaches to purify calpain comprise multiple chromatographic steps, and are labor-intensive, leading to low yields. Here we report a new purification procedure for the human m-calpain based on its reversible calcium-mediated interaction with the intrinsically disordered calpastatin...
2017: PloS One
https://www.readbyqxmd.com/read/28306722/distinct-erbb2-receptor-populations-differentially-interact-with-beta1-integrin-in-breast-cancer-cell-models
#6
Andrés Martín Toscani, Rocío G Sampayo, Federico Martín Barabas, Federico Fuentes, Marina Simian, Federico Coluccio Leskow
ErbB2 is a member of the ErbB family of tyrosine kinase receptors that plays a major role in breast cancer progression. Located at the plasma membrane, ErbB2 forms large clusters in spite of the presence of growth factors. Beta1 integrin, membrane receptor of extracellular matrix proteins, regulates adhesion, migration and invasiveness of breast cancer cells. Physical interaction between beta1 integrin and ErbB2 has been suggested although published data are contradictory. The aim of the present work was to study the interaction between ErbB2 and beta1 integrin in different scenarios of expression and activation...
2017: PloS One
https://www.readbyqxmd.com/read/28299731/heterologous-expression-of-the-astacin-protease-meprin-%C3%AE-in-pichia-pastoris
#7
Dagmar Schlenzig, Stephan Schilling
Meprins are zinc-dependent proteases of the metzincin superfamily of metalloproteases. The enzymes are extracellular multi-domain proteins which are stabilized by disulfide bridges, dimerization, and glycosylation. Due to their complex structure, recombinant expression was first established in mammalian and insect cells. However, these methods have several disadvantages such as high costs and the low yields. For this reason, yeast is often considered a preferable expression system. Here, we describe the manipulation and secretory expression of human meprin β in the methylotrophic yeast P...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28295785/improving-support-and-education-of-low-income-baby-boomers-diagnosed-with-chronic-hepatitis-c-virus-infection-through-universal-screening
#8
Barbara J Turner, Kathryn Craig, Vidhi S Makanji, Bertha E Flores, Ludivina Hernandez
AIMS AND OBJECTIVES: The objective of this study was to identify support needs of low income baby boomers recently diagnosed with chronic hepatitis C virus infection. BACKGROUND: The United States Preventive Services Task Force has endorsed one-time screening of all baby boomers (born 1945 to 1965) for hepatitis C because 75% of the estimated 2 to 3 million persons with chronic infection are in this age range. We hypothesized that persons diagnosed by routine screening would have significant psycho-emotional, cognitive, and health care challenges that need to be met by collaborative care and services from nurses and other health care personnel...
March 15, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28295342/an-information-theory-account-of-late-frontoparietal-erp-positivities-in-cognitive-control
#9
Francisco Barceló, Patrick S Cooper
ERP research on task switching has revealed distinct transient and sustained positive waveforms (latency circa 300-900 ms) while shifting task rules or stimulus-response (S-R) mappings. However, it remains unclear whether such switch-related positivities show similar scalp topography and index context-updating mechanisms akin to those posed for domain-general (i.e., classic P300) positivities in many task domains. To examine this question, ERPs were recorded from 31 young adults (18-30 years) while they were intermittently cued to switch or repeat their perceptual categorization of Gabor gratings varying in color and thickness (switch task), or else they performed two visually identical control tasks (go/no-go and oddball)...
March 15, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28293881/ancestral-protein-reconstruction-and-circular-permutation-for-improving-the-stability-and-dynamic-range-of-fret-sensors
#10
Ben E Clifton, Jason H Whitfield, Inmaculada Sanchez-Romero, Michel K Herde, Christian Henneberger, Harald Janovjak, Colin J Jackson
Small molecule biosensors based on Förster resonance energy transfer (FRET) enable small molecule signaling to be monitored with high spatial and temporal resolution in complex cellular environments. FRET sensors can be constructed by fusing a pair of fluorescent proteins to a suitable recognition domain, such as a member of the solute-binding protein (SBP) superfamily. However, naturally occurring SBPs may be unsuitable for incorporation into FRET sensors due to their low thermostability, which may preclude imaging under physiological conditions, or because the positions of their N- and C-termini may be suboptimal for fusion of fluorescent proteins, which may limit the dynamic range of the resulting sensors...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28293251/an-active-mitochondrial-complex-ii-present-in-mature-seeds-contains-an-embryo-specific-iron-sulfur-subunit-regulated-by-aba-and-bzip53-and-is-involved-in-germination-and-seedling-establishment
#11
Franko Restovic, Roberto Espinoza-Corral, Isabel Gómez, Jesús Vicente-Carbajosa, Xavier Jordana
Complex II (succinate dehydrogenase) is an essential mitochondrial enzyme involved in both the tricarboxylic acid cycle and the respiratory chain. In Arabidopsis thaliana, its iron-sulfur subunit (SDH2) is encoded by three genes, one of them (SDH2.3) being specifically expressed during seed maturation in the embryo. Here we show that seed SDH2.3 expression is regulated by abscisic acid (ABA) and we define the promoter region (-114 to +49) possessing all the cis-elements necessary and sufficient for high expression in seeds...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28286346/integrating-theoretical-models-with-functional-neuroimaging
#12
Michael S Pratte, Frank Tong
The development of mathematical models to characterize perceptual and cognitive processes dates back almost to the inception of the field of psychology. Since the 1990s, human functional neuroimaging has provided for rapid empirical and theoretical advances across a variety of domains in cognitive neuroscience. In more recent work, formal modeling and neuroimaging approaches are being successfully combined, often producing models with a level of specificity and rigor that would not have been possible by studying behavior alone...
February 2017: Journal of Mathematical Psychology
https://www.readbyqxmd.com/read/28282436/regions-of-very-low-h3k27me3-partition-the-drosophila-genome-into-topological-domains
#13
Sherif El-Sharnouby, Bettina Fischer, Jose Paolo Magbanua, Benjamin Umans, Rosalyn Flower, Siew Woh Choo, Steven Russell, Robert White
It is now well established that eukaryote genomes have a common architectural organization into topologically associated domains (TADs) and evidence is accumulating that this organization plays an important role in gene regulation. However, the mechanisms that partition the genome into TADs and the nature of domain boundaries are still poorly understood. We have investigated boundary regions in the Drosophila genome and find that they can be identified as domains of very low H3K27me3. The genome-wide H3K27me3 profile partitions into two states; very low H3K27me3 identifies Depleted (D) domains that contain housekeeping genes and their regulators such as the histone acetyltransferase-containing NSL complex, whereas domains containing moderate-to-high levels of H3K27me3 (Enriched or E domains) are associated with regulated genes, irrespective of whether they are active or inactive...
2017: PloS One
https://www.readbyqxmd.com/read/28282390/incidence-and-predictors-of-tuberculosis-among-hiv-infected-adults-after-initiation-of-antiretroviral-therapy-in-nigeria-2004-2012
#14
Ishani Pathmanathan, E Kainne Dokubo, Ray W Shiraishi, Simon G Agolory, Andrew F Auld, Dennis Onotu, Solomon Odafe, Ibrahim Dalhatu, Oseni Abiri, Henry C Debem, Adebobola Bashorun, Tedd Ellerbrock
BACKGROUND: Nigeria had the most AIDS-related deaths worldwide in 2014 (170,000), and 46% were associated with tuberculosis (TB). Although treatment of people living with HIV (PLHIV) with antiretroviral therapy (ART) reduces TB-associated morbidity and mortality, incident TB can occur while on ART. We estimated incidence and characterized factors associated with TB after ART initiation in Nigeria. METHODS: We analyzed retrospective cohort data from a nationally representative sample of adult patients on ART...
2017: PloS One
https://www.readbyqxmd.com/read/28281928/amyloid-cores-in-prion-domains-key-regulators-for-prion-conformational-conversion
#15
María Rosario Fernández, Cristina Batlle, Marcos Gil-García, Salvador Ventura
Despite the significant efforts devoted to decipher the particular protein features that encode for a prion or prion-like behavior, they are still poorly understood. The well-characterized yeast prions constitute an ideal model system to address this question, because, in these proteins, the prion activity can be univocally assigned to a specific region of their sequence, known as the prion forming domain (PFD). These PFDs are intrinsically disordered, relatively long and, in many cases, of low complexity, being enriched in glutamine/asparagine residues...
January 2, 2017: Prion
https://www.readbyqxmd.com/read/28272862/a-novel-n-type-organosilane-metal-ion-hybrid-of-rhodamine-b-and-copper-cation-for-low-temperature-thermoelectric-materials
#16
John R Bertram, Aubrey Penn, Matthew Jason Nee, Hemali Rathnayake
A n-type organosilane-metal-ion hybrid of Rhodamine-B silane and copper cation (Cu-RBS) was investigated as a low-temperature thermoelectric material. Computational analysis revealed the most likely localized binding site of Cu2+ to the Rhodamine-B core and provided predictions of molecular orbitals and electrostatic potentials upon complexation. The concentration-dependent optical absorption and emission spectral traces confirmed the effective metal-ligand charge transfer from Cu2+ to the xanthene core of RBS, indicating the potential for improved electrical properties for the complex relative to RBS...
March 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28272705/the-most-common-factors-hindering-the-independent-functioning-of-the-elderly-at-home-by-age-and-sex
#17
D Talarska, S Kropińska, M Strugała, M Szewczyczak, S Tobis, K Wieczorowska-Tobis
OBJECTIVE: Changes occurring with increased age as well progressive illnesses can negatively affect the independent functioning of older people. The goal of this study was to identify the most common problems that make independent life at home more difficult for the elderly and to try and present their relation with age and gender. PATIENTS AND METHODS: A total of 506 persons over 60 years of age took part in the study. They were residents of Poznań, Poland and surrounding areas...
February 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28272553/structure-activity-relationship-in-tlr4-mutations-atomistic-molecular-dynamics-simulations-and-residue-interaction-network-analysis
#18
Muhammad Ayaz Anwar, Sangdun Choi
Toll-like receptor 4 (TLR4), a vital innate immune receptor present on cell surfaces, initiates a signaling cascade during danger and bacterial intrusion. TLR4 needs to form a stable hexamer complex, which is necessary to dimerize the cytoplasmic domain. However, D299G and T399I polymorphism may abrogate the stability of the complex, leading to compromised TLR4 signaling. Crystallography provides valuable insights into the structural aspects of the TLR4 ectodomain; however, the dynamic behavior of polymorphic TLR4 is still unclear...
March 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28269718/analysis-of-the-sleep-eeg-in-the-complexity-domain
#19
Sara Mariani, Ana F T Borges, Teresa Henriques, Robert J Thomas, Samuel J Leistedt, Paul Linkowski, Jean-Pol Lanquart, Ary L Goldberger, Madalena D Costa
Conventional sleep analysis relies primarily on electroencephalogram (EEG) waveform features assessed in concert with eye movements, respiration and muscle tone. We explore a complementary "complexity domain" approach based on multiscale entropy (MSE) analysis of EEG signals and discuss its relationships to standard sleep analysis and to that based on electrocardiogram (ECG)-derived cardiopulmonary coupling (CPC). We observe a progressive decrease in complexity associated with decreased arousability, as measured by both conventional sleep scoring and CPC analysis...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28265517/the-impact-of-human-development-on-individual-health-a-causal-mediation-analysis-examining-pathways-through-education-and-body-mass-index
#20
Aolin Wang, Onyebuchi A Arah
BACKGROUND: The macro environment we live in projects what we can achieve and how we behave, and in turn, shapes our health in complex ways. Policymaking will benefit from insights into the mechanisms underlying how national socioeconomic context affects health. This study examined the impact of human development on individual health and the possible mediating roles of education and body mass index (BMI). METHODS: We analyzed World Health Survey data on 109,448 participants aged 25 or older from 42 low- and middle-income countries with augmented human development index (HDI) in 1990...
2017: PeerJ
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