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CA2 interactions

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https://www.readbyqxmd.com/read/28630259/triacylglycerol-mimetics-regulate-membrane-interactions-of-glycogen-branching-enzyme-implications-for-therapy
#1
Rafael Alvarez, Jesús Casas, David J López, Maitane Ibarguren, Ariadna Suari-Rivera, Silvia Terés, Francisca Guardiola-Serrano, Alexander Lossos, Xavier Busquets, Or Kakhlon, Pablo V Escribá
Adult Polyglucosan Body Disease (APBD) is a neurological disorder characterized by adult-onset neurogenic bladder, spasticity, weakness, and sensory loss. The disease is caused by aberrant glycogen branching enzyme (GBE1-Y329S) yielding less branched, globular and soluble glycogen which tends to aggregate. We explore here whether, despite being a soluble enzyme, GBE1 activity is regulated by protein-membrane interactions. Since soluble proteins can contact a wide variety of cell membranes, we investigated the interactions of purified wild-type and Y329S GBE1 proteins with different types of model membranes (liposomes)...
June 19, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28627884/hdx-ms-reveals-calcium-binding-properties-and-allosteric-regulation-of-downstream-regulatory-element-antagonist-modulator-dream
#2
Jun Zhang, Jing Li, Theodore A Craig, Rajiv Kumar, Michael L Gross
Downstream regulatory element antagonist modulator (DREAM) is an EF-hand Ca2+-binding protein that also binds to specific DNA sequence, downstream regulatory elements (DRE), and thereby regulates transcription in a calcium-dependent fashion. DREAM binds to DRE in the absence of Ca2+, but detaches from DRE under Ca2+ stimulation, allowing gene expression. The Ca2+-binding properties of DREAM and the consequences of the binding on protein structure are key to understanding the function of DREAM. Here we describe the application of hydrogen deuterium exchange mass spectrometry (HDX-MS) and site-directed mutagenesis to investigate the Ca2+ binding properties and the subsequent conformational changes of full length DREAM...
June 19, 2017: Biochemistry
https://www.readbyqxmd.com/read/28612471/metal-cations-induced-%C3%AE-%C3%AE-bchl-a-heterogeneity-in-lh1-as-revealed-by-temperature-dependent-fluorescence-splitting
#3
Fei Ma, Long-Jiang Yu, Manuel J Llansola-Portoles, Bruno Robert, Zheng-Yu Wang-Otomo, Rienk van Grondelle
Two spectral forms of the core light-harvesting complex (LH1) of the purple bacterium Thermochromatium (Tch.) tepidum, native Ca2+-binding and Ba2+-substituted one, exhibit different fluorescence (FL) emission spectra at low temperature. While Ca-LH1 exhibits one emission band, an unusual splitting of the fluorescence is observed for Ba-LH1. These two sub-bands display the same spectral width dependence according to temperature, but their intensity evolutions with the temperature are different. Based on the crystal structures, we propose that the FL splitting originates from a large αβ-BChl a transition energy heterogeneity, ~600 cm-1, actually much larger than usually in other LH1 and LH2 complexes (80-200 cm-1)...
June 13, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28602072/influence-of-surface-functional-groups-on-deposition-and-release-of-tio2-nanoparticles
#4
Zhiwei Wang, Xueye Wang, Junyao Zhang, Xueqing Yu, Zhichao Wu
A clear understanding of the factors governing the deposition and release behaviors of engineered nanoparticles (NPs), such as TiO2 NPs, is necessary for predicting their transport and fate in both natural and engineered aquatic environments. In this study, impacts of specific chemistries on TiO2 NP deposition, as a function of TiO2 NP concentration and ionic strength/valence, were investigated using self-assembled monolayers (SAMs) with five different ending chemical functionalities (-CH3, -OH, -COOH, -NH2, and -CONH2)...
June 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28594234/peroxiredoxins-and-redox-signaling-in-plants
#5
Michael Liebthal, Daniel Maynard, Karl-Josef Dietz
SIGNIFICANCE: Peroxiredoxins (Prx) are thiol peroxidases with multiple functions in the antioxidant defense and redox signaling network of the cell. Our progressing understanding assigns both local and global significance to plant Prxs which are grouped in four Prx types. In plants they are localized to the cytosol, mitochondrion, plastid and nucleus. Antioxidant defense is fundamentally connected to redox signaling, cellular communication and acclimation. The thiol-disulfide network is central part of the stress sensing and processing response and integrates information input with redox regulation...
June 8, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28576939/the-x-linked-intellectual-disability-protein-il1rapl1-regulates-dendrite-complexity
#6
Caterina Montani, Mariana Ramos-Brossier, Luisa Ponzoni, Laura Gritti, Andrzej W Cwetsch, Daniela Braida, Yoann Saillour, Benedetta Terragni, Massimo Mantegazza, Mariaelvina Sala, Chiara Verpelli, Pierre Billuart, Carlo Sala
Mutations and deletions of Interleukin-1 receptor accessory protein like 1 (IL1RAPL1) gene, localized on X chromosome, are associated to intellectual disability (ID) and autism spectrum disorder (ASD). IL1RAPL1 protein is localized at the postsynaptic compartment of excitatory synapses and plays a role in synapse formation and stabilization. Here we characterized the role of IL1RAPL1 in regulating dendrite morphology using primary neuronal cultures and Il1rapl1-KO mice. We identified, associated to hippocampal cognitive impairment, an increased number of dendrite branching points in CA1 and CA2 hippocampal neurons of Il1rapl1-KO mice...
June 2, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28574251/non-native-metal-ion-reveals-the-role-of-electrostatics-in-synaptotagmin-1-membrane-interactions
#7
Sachin Katti, Sarah B Nyenhuis, Bin Her, Atul K Srivastava, Alexander B Taylor, P John Hart, David S Cafiso, Tatyana I Igumenova
C2 domains are independently folded modules that often target their host proteins to anionic membranes in a Ca(2+)-dependent manner. In these cases, membrane association is triggered by Ca(2+) binding to the negatively charged loop region of the C2 domain. Here, we used a non-native metal ion, Cd(2+), in lieu of Ca(2+) to gain insight into the contributions made by long-range Coulombic interactions and direct metal ion-lipid bridging to membrane binding. Using X-ray crystallography, NMR, Förster resonance energy transfer, and vesicle cosedimentation assays, we demonstrate that, although Cd(2+) binds to the loop region of C2A/B domains of synaptotagmin 1 with high affinity, long-range Coulombic interactions are too weak to support membrane binding of individual domains...
June 15, 2017: Biochemistry
https://www.readbyqxmd.com/read/28566286/rab35-regulates-evoked-exocytosis-of-endothelial-weibel-palade-bodies
#8
Anja Biesemann, Alexandra Gorontzi, Francis Barr, Volker Gerke
Weibel-Palade bodies (WPB) are secretory organelles of endothelial cells that undergo evoked exoyctosis following intracellular Ca2+ or cAMP elevation, thereby supplying the vasculature with factors controlling haemostasis. Several cytosolic and membrane-associated proteins, including the Rab family members Rab3, Rab15 and Rab27a, have been implicated in regulating the acute exocytosis of WPB. Here, we carried out a genome-wide screen to identify Rab pathways affecting WPB exocytosis. Overexpression of a specific subset of Rab GTPase-activating proteins (RabGAPs) inhibited histamine-evoked, Ca2+-dependent WPB exocytosis, presumably by inactivating the target RabGTPases...
May 31, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28566250/local-somatodendritic-translation-and-hyperphosphorylation-of-tau-protein-triggered-by-ampa-and-nmda-receptor-stimulation
#9
Shunsuke Kobayashi, Toru Tanaka, Yoshiyuki Soeda, Osborne F X Almeida, Akihiko Takashima
Tau is a major component of the neurofibrillary tangles (NFT) that represent a pathological hallmark of Alzheimer's disease (AD). Although generally considered an axonal protein, Tau is found in the somato-dendritic compartment of degenerating neurons and this redistribution is thought to be a trigger of neurodegeneration in AD. Here, we show the presence of tau mRNA in a dendritic ribonucleoprotein (RNP) complex that includes Ca2(+)-calmodulin dependent protein kinase (CaMK)IIα mRNA and that is translated locally in response to glutamate stimulation...
May 17, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28554311/the-role-of-sigma-1-receptor-an-intracellular-chaperone-in-neurodegenerative-diseases
#10
Botond Penke, Lívia Fülöp, Mária Szűcs, Ede Frecska
Widespread protein aggregation occurs in the living system under stress or during aging, owing to disturbance of endoplasmic reticulum (ER) proteostasis. Many neurodegenerative diseases may have a common mechanism: the failure of protein homeostasis. Perturbation of ER results in unfolded protein response (UPR). Prolonged chronical UPR may activate apoptotic pathways and cause cell death. ER is associated to mitochondria by the mitochondria-associated ER-membrane, MAM. The sigma-1 receptor (Sig-1R), a well-known ER-chaperone localizes in the MAM...
May 28, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28550085/knockdown-of-sodium-calcium-exchanger-1-induces-epithelial-to-mesenchymal-transition-in-kidney-epithelial-cells
#11
Sona Lakshme Balasubramaniam, Anilkumar Gopalakrishnapillai, Nicholas J Petrelli, Sonali P Barwe
Mesenchymal to epithelial transition (MET) and epithelial to mesenchymal transition (EMT) are important processes in kidney development. Failure to undergo MET during development leads to the initiation of Wilms tumor (WT) whereas EMT contributes to the development of renal cell carcinomas (RCC). The role of calcium regulators in governing these processes is becoming evident. We demonstrated earlier that Na+/Ca2+ exchanger 1 (NCX1), a major calcium exporter in renal epithelial cells, regulates epithelial cell motility...
May 26, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28541442/cbl-interacting-protein-kinase-6-negatively-regulates-immune-response-to-pseudomonas-syringae-in-arabidopsis
#12
Atish Sardar, Ashis Kumar Nandi, Debasis Chattopadhyay
Cytosolic calcium ion (Ca2+) is an essential mediator of the plant innate immune response. Here, we report that a calcium-regulated protein kinase Calcineurin B-like protein (CBL)-interacting protein kinase 6 (CIPK6) functions as a negative regulator of immunity against the bacterial pathogen Pseudomonas syringae in Arabidopsis thaliana. Arabidopsis lines with compromised expression of CIPK6 exhibited enhanced disease resistance to the bacterial pathogen and to P. syringae harboring certain but not all avirulent effectors, while restoration of CIPK6 expression resulted in abolition of resistance...
May 24, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28531251/ca2-dependent-phosphoregulation-of-the-plasma-membrane-ca2-atpase-aca8-modulates-stimulus-induced-calcium-signatures
#13
Alex Costa, Laura Luoni, Claudia Adriana Marrano, Kenji Hashimoto, Philipp Köster, Sonia Giacometti, Maria Ida De Michelis, Jörg Kudla, Maria Cristina Bonza
Ca2+ signals are transient, hence, upon a stimulus-induced increase in cytosolic Ca2+ concentration, cells have to re-establish resting Ca2+ levels. Ca2+ extrusion is operated by a wealth of transporters, such as Ca2+ pumps and Ca2+/H+ antiporters, which often require a rise in Ca2+ concentration to be activated. Here, we report a regulatory fine-tuning mechanism of the Arabidopsis thaliana plasma membrane-localized Ca2+-ATPase isoform ACA8 that is mediated by calcineurin B-like protein (CBL) and CBL-interacting protein kinase (CIPK) complexes...
May 20, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28520808/proteomic-analysis-of-biomphalaria-glabrata-plasma-proteins-with-binding-affinity-to-those-expressed-by-early-developing-larval-schistosoma-mansoni
#14
Xiao-Jun Wu, Nathalie Dinguirard, Grzegorz Sabat, Hong-di Lui, Laura Gonzalez, Michael Gehring, Utibe Bickham-Wright, Timothy P Yoshino
Interactions between early developing Schistosoma mansoni larval stages and the hemolymph of its snail intermediate host represent the first molecular encounter with the snail's immune system. To gain a more comprehensive understanding of this early parasite-host interaction, biotinylated sporocyst tegumental membrane (Mem) proteins and larval transformation proteins (LTP) were affixed to streptavidin-agarose beads and used as affinity matrices to enrich for larval-reactive plasma proteins from susceptible (NMRI) and resistant (BS-90) strains of the snail Biomphalaria glabrata...
May 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28515322/g%C3%AE-%C3%AE-directly-modulates-vesicle-fusion-by-competing-with-synaptotagmin-for-binding-to-neuronal-snare-proteins-embedded-in-membranes
#15
Zack Zurawski, Brian Page, Michael C Chicka, Rebecca L Brindley, Christopher A Wells, Anita M Preininger, Karren Hyde, James A Gilbert, Osvaldo Cruz-Rodriguez, Kevin P M Currie, Edwin R Chapman, Simon Alford, Heidi E Hamm
Gi/o-coupled GPCRs can inhibit neurotransmitter release at synapses via multiple mechanisms. In addition to Gβγ-mediated modulation of voltage-gated calcium channels(VGCC), inhibition can also be mediated through the direct interaction of Gβγ subunits with the soluble N-ethylmaleimide attachment protein receptor (SNARE) complex of the vesicle fusion apparatus. Binding studies with soluble SNARE complexes have shown that Gβγ binds to both ternary SNARE complexes, t-SNARE heterodimers, and monomeric SNAREs, competing with synaptotagmin(syt)1 for binding sites on t-SNARE...
May 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28494008/blocking-of-stromal-interaction-molecule-1-expression-influence-cell-proliferation-and-promote-cell-apoptosis-in-vitro-and-inhibit-tumor-growth-in-vivo-in-head-and-neck-squamous-cell-carcinoma
#16
Ping Li, Xue-Yan Bian, Qing Chen, Xiao-Feng Yao, Xu-Dong Wang, Wen-Chao Zhang, Ying-Jie Tao, Rui Jin, Lun Zhang
Calcium signal plays an important role in a variety of cancer cell metabolism, but knowledge on its role in head and neck squamous cell carcinoma (HNSCC) is limited. Store-operated calcium entry (SOCE) is the principal Ca2+ entry mechanism that maintains calcium concentration and produces calcium signal in non-excitable cells. SOCE is triggered by stromal interaction molecule 1 (STIM1), which is located in endoplasmic reticulum (ER) as Ca2+ sensor. Although, many studies demonstrated that STIM1 and SOCE play important functions in the regulation of many cancer progressions, their clinical relevance in HNSCC remains unclear...
2017: PloS One
https://www.readbyqxmd.com/read/28494003/p2y6-receptors-are-involved-in-mediating-the-effect-of-inactivated-avian-influenza-virus-h5n1-on-il-6-cxcl8-mrna-expression-in-respiratory-epithelium
#17
Nawiya Huipao, Suparerk Borwornpinyo, Suwimon Wiboon-Ut, Craig R Campbell, Il-Ha Lee, Siriphun Hiranyachattada, Chonlaphat Sukasem, Arunee Thitithanyanont, Chumpol Pholpramool, David I Cook, Anuwat Dinudom
One of the key pathophysiologies of H5N1 infection is excessive proinflammatory cytokine response (cytokine storm) characterized by increases in IFN-β, TNF-α, IL-6, CXCL10, CCL4, CCL2 and CCL5 in the respiratory tract. H5N1-induced cytokine release can occur via an infection-independent mechanism, however, detail of the cellular signaling involved is poorly understood. To elucidate this mechanism, the effect of inactivated (β-propiolactone-treated) H5N1 on the cytokine and chemokine mRNA expression in 16HBE14o- human respiratory epithelial cells was investigated...
2017: PloS One
https://www.readbyqxmd.com/read/28493957/ezrin-interacts-with-s100a4-via-both-its-n-and-c-terminal-domains
#18
Beáta Biri-Kovács, Bence Kiss, Henrietta Vadászi, Gergő Gógl, Gyula Pálfy, György Török, László Homolya, Andrea Bodor, László Nyitray
Ezrin belongs to the ERM (ezrin, radixin, moesin) protein family that has a role in cell morphology changes, adhesion and migration as an organizer of the cortical cytoskeleton by linking actin filaments to the apical membrane of epithelial cells. It is highly expressed in a variety of human cancers and promotes metastasis. Members of the Ca2+-binding EF-hand containing S100 proteins have similar pathological properties; they are overexpressed in cancer cells and involved in metastatic processes. In this study, using tryptophan fluorescence and stopped-flow kinetics, we show that S100A4 binds to the N-terminal ERM domain (N-ERMAD) of ezrin with a micromolar affinity...
2017: PloS One
https://www.readbyqxmd.com/read/28487373/interactions-between-small-ankyrin-1-and-sarcolipin-coordinately-regulate-activity-of-the-sarco-endo-plasmic-reticulum-ca2-atpase-serca1
#19
Patrick F Desmond, Amanda Labuza, Joaquin Muriel, Michele L Markwardt, Allison E Mancini, Mark A Rizzo, Robert J Bloch
SERCA1, the sarco(endo)plasmic reticulum Ca2+-ATPase of skeletal muscle, is essential for muscle relaxation and maintenance of low resting Ca2+ levels in the myoplasm. We recently reported that small ankyrin 1 (sAnk1) interacts with the sarco(endo)plasmic reticulum Ca2+-ATPase in skeletal muscle (SERCA1) to inhibit its activity (1). We also showed that this interaction is mediated at least in part through sAnk1's transmembrane domain in a manner similar to that of sarcolipin (SLN). Earlier studies have shown that SLN and phospholamban (PLN), the other well-studied small SERCA-regulatory proteins, oligomerize either alone or together...
May 9, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28481223/ca2-channel-clustering-with-insulin-containing-granules-is-disturbed-in-type-2-diabetes
#20
Nikhil R Gandasi, Peng Yin, Michela Riz, Margarita V Chibalina, Giuliana Cortese, Per-Eric Lund, Victor Matveev, Patrik Rorsman, Arthur Sherman, Morten G Pedersen, Sebastian Barg
Loss of first-phase insulin secretion is an early sign of developing type 2 diabetes (T2D). Ca2+ entry through voltage-gated L-type Ca2+ channels triggers exocytosis of insulin-containing granules in pancreatic β cells and is required for the postprandial spike in insulin secretion. Using high-resolution microscopy, we have identified a subset of docked insulin granules in human β cells and rat-derived clonal insulin 1 (INS1) cells for which localized Ca2+ influx triggers exocytosis with high probability and minimal latency...
June 1, 2017: Journal of Clinical Investigation
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