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https://www.readbyqxmd.com/read/27926480/calcium-dependent-binding-of-myc-to-calmodulin
#1
Philipp Raffeiner, Andrea Schraffl, Thomas Schwarz, Ruth Röck, Karin Ledolter, Markus Hartl, Robert Konrat, Eduard Stefan, Klaus Bister
The bHLH-LZ (basic region/helix-loop-helix/leucine zipper) oncoprotein Myc and the bHLH-LZ protein Max form a binary transcription factor complex controlling fundamental cellular processes. Deregulated Myc expression leads to neoplastic transformation and is a hallmark of most human cancers. The dynamics of Myc transcription factor activity are post-translationally coordinated by defined protein-protein interactions. Here, we present evidence for a second messenger controlled physical interaction between the Ca2+ sensor calmodulin (CaM) and all Myc variants (v-Myc, c-Myc, N-Myc, and L-Myc)...
December 1, 2016: Oncotarget
https://www.readbyqxmd.com/read/27925190/s100a1-and-s100b-calcium-sensors-at-the-cross-roads-of-multiple-chondrogenic-pathways
#2
REVIEW
José Diaz-Romero, Dobrila Nesic
The S100 protein family comprises more than 20 members of small calcium binding proteins operating as Ca2 + -activated switches that interact and modulate the activity of a large number of targets. S100A1 and S100B, two members of this family, have been recently associated with the differentiation status of human articular chondrocytes. Both proteins are homogeneously expressed in all cartilage zones, their expression decreases during chondrocyte dedifferentiation, and can be induced under conditions promoting redifferentiation...
December 7, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27913425/cd36-mediates-h2o2-induced-calcium-influx-in-lung-microvascular-endothelial-cells
#3
Karthik Suresh, Laura Servinsky, Jose Reyes, Clark Undem, Joel Zaldumbide, Otgonchimeg Rentsendorj, Sruti Modekurty, Jeffrey M Dodd-O, Alan L Scott, David B Pearse, Larissa A Shimoda
Elevated levels of reactive oxygen species (ROS) and intracellular Ca2+ play a key role in endothelial barrier dysfunction in acute lung injury (ALI). We previously showed that H2O2-induced increases in intracellular calcium concentrations ([Ca2+]i) in LMVECs involve the membrane Ca2+ channel, transient receptor potential vanilloid-4 (TRPV4), and that inhibiting this channel attenuated H2O2-induced barrier disruption in vitro. We also showed that phosphorylation of TRPV4 by the Src family kinase, Fyn, contributes to H2O2-induced Ca2+ influx in LMVEC...
December 2, 2016: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27908976/a-novel-method-for-culturing-stellate-astrocytes-reveals-spatially-distinct-ca2-signaling-and-vesicle-recycling-in-astrocytic-processes
#4
Anne C Wolfes, Saheeb Ahmed, Ankit Awasthi, Markus A Stahlberg, Ashish Rajput, Daniel S Magruder, Stefan Bonn, Camin Dean
Interactions between astrocytes and neurons rely on the release and uptake of glial and neuronal molecules. But whether astrocytic vesicles exist and exocytose in a regulated or constitutive fashion is under debate. The majority of studies have relied on indirect methods or on astrocyte cultures that do not resemble stellate astrocytes found in vivo. Here, to investigate vesicle-associated proteins and exocytosis in stellate astrocytes specifically, we developed a simple, fast, and economical method for growing stellate astrocyte monocultures...
December 1, 2016: Journal of General Physiology
https://www.readbyqxmd.com/read/27907086/stcdpk3-phosphorylates-in-vitro-two-transcription-factors-involved-in-ga-and-aba-signaling-in-potato-strsg1-and-stabf1
#5
Carolina Grandellis, Elisa Fantino, María Noelia Muñiz García, Magalí Graciela Bialer, Franco Santin, Daniela Andrea Capiati, Rita María Ulloa
Calcium-dependent protein kinases, CDPKs, decode calcium (Ca2+) transients and initiate downstream responses in plants. In order to understand how CDPKs affect plant physiology, their specific target proteins must be identified. In tobacco, the bZIP transcription factor Repression of Shoot Growth (NtRSG) that modulates gibberellin (GA) content is a specific target of NtCDPK1. StCDPK3 from potato is homologous (88% identical) to NtCDPK1 even in its N-terminal variable domain. In this work, we observe that NtRSG is also phosphorylated by StCDPK3...
2016: PloS One
https://www.readbyqxmd.com/read/27899535/a-tomato-universal-stress-protein-involved-in-oxidative-stress-is-a-cipk6-phosphorylation-target
#6
Emilio Gutierrez-Beltran, José María Personat, Fernando N de la Torre, Olga Del Pozo
Calcineurin B-like interacting protein kinases (CIPKs) decode calcium signals upon interaction with the calcium sensors calcineurin B like proteins (CBLs) into phosphorylation events that result into adaptation to environmental stresses. Few phosphorylation targets of CIPKs are known and therefore the molecular mechanisms underlying their downstream output responses are not fully understood. Tomato (Solanum lycopersicum) Cipk6 regulates immune and susceptible Programmed cell death (PCD) in immunity transforming Ca2+ signals into Reactive Oxygen Species (ROS) signaling...
November 29, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27886057/age-related-modulations-of-aqp4-and-caveolin-1-in-the-hippocampus-predispose-the-toxic-effect-of-phoneutria-nigriventer-spider-venom
#7
Edilene S Soares, Leila M Stávale, Monique C P Mendonça, Andressa Coope, Maria Alice da Cruz-Höfling
We have previously demonstrated that Phoneutria nigriventer venom (PNV) causes blood-brain barrier (BBB) breakdown, swelling of astrocytes end-feet and fluid permeation into brain interstitium in rats. Caveolae and water channels respond to BBB alterations by co-participation in shear stress response and edema formation/resolution. Herein, we showed post-natal developmental-related changes of two BBB-associated transporter proteins: the endothelial caveolin-1 (Cav-1), the major scaffolding protein from caveolae frame, and the astroglial aquaporin-4 (AQP4), the main water channel protein expressed in astrocytic peri-vascular end-feet processes, in the hippocampus of rats intraperitoneally-administered PNV...
November 23, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27872158/filamin-a-is-reduced-and-contributes-to-the-casr-sensitivity-in-human-parathyroid-tumors
#8
Alessandra Mingione, Chiara Verdelli, Stefano Ferrero, Valentina Vaira, Vito Guarnieri, Alfredo Scillitani, Leonardo Vicentini, Gianni Balza, Edoardo Beretta, Annalisa Terranegra, Giuseppe Vezzoli, Laura Soldati, Sabrina Corbetta
Parathyroid tumors display reduced sensitivity to extracellular calcium ([Ca2+]o). [Ca2+]o activates calcium-sensing receptor (CASR), which interacts with the scaffold protein filamin A (FLNA). The study aimed to investigate: 1) the FLNA expression in human parathyroid tumors, 2) its effects on the CASR mRNA and protein expression, and 3) on ERK signaling activation, 4) the effect of the carboxy-terminal CASR variants and 5) of the treatment with the CASR agonist R568 on FLNA-mediated ERK phosphorylation in HEK293 cells...
November 21, 2016: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/27870895/simulated-respiratory-secretion-for-use-in-the-development-of-influenza-diagnostic-assays
#9
Michael E Bose, Kate C McCaul, Hong Mei, Amy Sasman, Jie He, William Kramp, Roxanne Shively, Ke Yan, Kelly J Henrickson
Many assays have been developed for the detection of influenza virus which is an important respiratory pathogen. Development of these assays commonly involves the use of human clinical samples for validation of their performance. However, clinical samples can be difficult to obtain, deteriorate over time, and be inconsistent in composition. The goal of this study was to develop a simulated respiratory secretion (SRS) that could act as a surrogate for clinical samples. To this end, we determined the effects major respiratory secretion components (Na+, K+, Ca2+, cells, albumin IgG, IgM, and mucin) have on the performance of influenza assays including both nucleic acid amplification and rapid antigen assays...
2016: PloS One
https://www.readbyqxmd.com/read/27862430/hydroxyapatite-nanowires-metal-organic-framework-core-shell-nanofibers-templated-synthesis-peroxidase-like-activity-and-their-derived-flexible-recyclable-test-paper
#10
Fei-Fei Chen, Ying-Jie Zhu, Zhi-Chao Xiong, Tuan-Wei Sun
The templated synthesis of metal-organic framework (MOF) nanofibers has been demonstrated herein. The ultralong hydroxyapatite (HAP) nanowires are chosen as the hard template to induce the nucleation and growth of MIL-100(Fe) (one of the typical MOFs) using the layer-by-layer method. The coulomb and chelation interactions between Ca2+ ions on the surface of HAP nanowires and organic linkers (COO-) of MIL-100(Fe) play key roles in the formation process. The as-prepared water-stable hydroxyapatite nanowires@MIL-100(Fe) nanofibers show peroxidase-like activity towards the oxidation of different peroxidase substrates in the presence of H2O2 accompanied with obvious color change of the solution...
November 14, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27846263/nicotine-induced-effects-on-nicotinic-acetylcholine-receptors-nachrs-ca2-and-brain-derived-neurotrophic-factor-bdnf-in-stc-1-cells
#11
Jie Qian, Shobha K Mummalaneni, Reem M Alkahtani, Sunila Mahavadi, Karnam S Murthy, John R Grider, Vijay Lyall
In addition to the T2R bitter taste receptors, neuronal nicotinic acetylcholine receptors (nAChRs) have recently been shown to be involved in the bitter taste transduction of nicotine, acetylcholine and ethanol. However, at present it is not clear if nAChRs are expressed in enteroendocrine cells other than beta cells of the pancreas and enterochromaffin cells, and if they play a role in the synthesis and release of neurohumoral peptides. Accordingly, we investigated the expression and functional role of nAChRs in enteroendocrine STC-1 cells...
2016: PloS One
https://www.readbyqxmd.com/read/27826057/adenylyl-cyclase-5-links-changes-in-calcium-homeostasis-to-camp-dependent-cyst-growth-in-polycystic-liver-disease
#12
Carlo Spirli, Valeria Mariotti, Ambra Villani, Luca Fabris, Romina Fiorotto, Mario Strazzabosco
BACKGROUND/AIMS: Genetic defects in Polycystins -1 or -2 (PC1 or PC2) cause polycystic liver disease associated with ADPKD (PLD-ADPKD). Progressive cyst growth is sustained by a cAMP-dependent Ras/ERK/HIFα pathway leading to increased autocrine/paracrine VEGF-A signalling. In PC2-defective cholangiocytes, store-operated Ca(2+) entry (SOCE), intracellular and endoplasmic reticulum [Ca(2+)]ER levels are reduced, while cAMP production in response to [Ca(2+)]ER depletion is increased. We hypothesized that in PC2-defective cells, in response to [Ca(2+)]ER depletion, the Ca(2+)-inhibitable adenylyl-cyclases AC5 or AC6 are activated by the ER chaperon STIM1 resulting in cAMP/PKA-dependent Ras/ERK/HIFα pathway activation...
November 5, 2016: Journal of Hepatology
https://www.readbyqxmd.com/read/27821621/dopamine-d1a-directly-interacts-with-otoferlin-synaptic-pathway-proteins-ca2-and-phosphorylation-underlie-an-nsf-to-ap2mu1-molecular-switch
#13
Dakshnamurthy Selvakumar, Marian J Drescher, Nathan A Deckard, Neeliyath A Ramakrishnan, Barbara J Morley, Dennis G Drescher
Dopamine receptors regulate exocytosis via protein-protein interactions (PPIs) as well as via adenylyl cyclase transduction pathways. Evidence has been obtained for PPIs in inner ear hair cells coupling D1A to SNARE-related proteins snapin, otoferlin, NSF, and AP2mu1, dependent on [Ca(2+)] and phosphorylation. Specifically, the carboxy terminus of dopamine D1A was found to directly bind t-SNARE-associated protein snapin in teleost and mammalian hair cell models by yeast two-hybrid and pull-down assays, and snapin directly interacts with  hair cell calcium-sensor otoferlin...
November 7, 2016: Biochemical Journal
https://www.readbyqxmd.com/read/27820860/structure-and-calcium-binding-properties-of-a-neuronal-calcium-myristoyl-switch-protein-visinin-like-protein-3
#14
Congmin Li, Sunghyuk Lim, Karl H Braunewell, James B Ames
Visinin-like protein 3 (VILIP-3) belongs to a family of Ca2+-myristoyl switch proteins that regulate signal transduction in the brain and retina. Here we analyze Ca2+ binding, characterize Ca2+-induced conformational changes, and determine the NMR structure of myristoylated VILIP-3. Three Ca2+ bind cooperatively to VILIP-3 at EF2, EF3 and EF4 (KD = 0.52 μM and Hill slope of 1.8). NMR assignments, mutagenesis and structural analysis indicate that the covalently attached myristoyl group is solvent exposed in Ca2+-bound VILIP-3, whereas Ca2+-free VILIP-3 contains a sequestered myristoyl group that interacts with protein residues (E26, Y64, V68), which are distinct from myristate contacts seen in other Ca2+-myristoyl switch proteins...
2016: PloS One
https://www.readbyqxmd.com/read/27798963/the-iqgap1-n-terminus-forms-dimers-and-the-dimer-interface-is-required-for-binding-f-actin-and-ca2-calmodulin
#15
Jing Liu, Vinodh B Kurella, Louis Lecour, Tomas Vanagunas, David K Worthylake
IQGAP1 is a multi-domain scaffold protein involved in many cellular processes. We have determined the crystal structure of an N-terminal fragment spanning residues 1-191 (CHDF hereafter) which contains the entire calponin homology domain. The structure of the CHDF is very similar to other Type 3 calponin homology domains like those from calponin, Vav, and the yeast IQGAP1 ortholog Rng2. However, in the crystal two CHDF molecules form a "head-to-head" or parallel dimer through mostly hydrophobic interactions...
October 31, 2016: Biochemistry
https://www.readbyqxmd.com/read/27789712/the-cytoplasmic-region-of-inner-helix-s6-is-an-important-determinant-of-cardiac-ryanodine-receptor-channel-gating
#16
Bo Sun, Wenting Guo, Xixi Tian, Jinjing Yao, Lin Zhang, Ruiwu Wang, S R Wayne Chen
The ryanodine receptor (RyR) channel pore is formed by four S6 inner helices with its intracellular gate located at the S6 helix bundle crossing region. The cytoplasmic region of the extended S6 helix is held by the U-motif of the Central domain, and is thought to control the opening and closing of the S6 helix bundle. However, the functional significance of the S6 cytoplasmic region in channel gating is unknown. Here we assessed the role of the S6 cytoplasmic region in the function of cardiac RyR (RyR2) via structure-guided site-directed mutagenesis...
October 27, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27771701/a-comprehensive-review-on-eryptosis
#17
Etheresia Pretorius, Jeanette N du Plooy, Janette Bester
Erythrocytes (RBCs) are extremely sensitive cells, and although they do not have nuclei and mitochondria, are important health indicators. This is particularly true because, during inflammation, whether it is systemic or chronic, the haematological system is constantly exposed to circulating inflammatory mediators. RBCs have a highly specialized and organized membrane structure, which interacts and reacts to inflammatory molecule insults, and undergo programmed cell death, similar to apoptosis, known as eryptosis...
October 24, 2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27738100/novel-compounds-targeting-the-mitochondrial-protein-vdac1-inhibit-apoptosis-and-protect-against-mitochondrial-dysfunction
#18
Danya Ben-Hail, Racheli Begas-Shvartz, Moran Shalev, Anna Shteinfer-Kuzmine, Arie Gruzman, Simona Reina, Vito De Pinto, Varda Shoshan-Barmatz
Apoptosis is thought to play a critical role in several pathological processes, such as neurodegenerative diseases (i.e. Parkinson's and Alzheimer's diseases) and various cardiovascular diseases. Despite the fact that apoptotic mechanisms are well defined, there is still no substantial therapeutic strategy to stop or even slow this process. Thus, there is an unmet need for therapeutic agents that are able to block or slow apoptosis in neurodegenerative and cardiovascular diseases. The outer mitochondrial membrane protein voltage-dependent anion channel 1 (VDAC1) is a convergence point for a variety of cell survival and death signals, including apoptosis...
November 25, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27736058/a-highly-efficient-luminescent-metal-organic-framework-for-the-simultaneous-detection-and-removal-of-heavy-metals-from-water
#19
Nathan D Rudd, Hao Wang, Erika M A Fuentes-Fernandez, Simon J Teat, Feng Chen, Gene Stephen Hall, Yves J Chabal, Jing Li
We have designed and synthesized an isoreticular series of luminescent metal-organic frameworks (LMOFs) by incorporating a strongly emissive molecular fluorophore and functionally diverse co-linkers into Zn-based structures. The three-dimensional porous networks of LMOF-261, -262 and -263 represent a unique/new type of nets, classified as a 2-nodal, (4,4)-c net (mot-e type) with four-fold, class IIIa interpenetration. All compounds crystallize in body-centered tetragonal crystal system (space group I41/a). A systematic study has been implemented to analyze their interactions with heavy metals...
October 13, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27706148/calcium-stimulates-self-assembly-of-protein-kinase-c-%C3%AE-in-vitro
#20
Carter J Swanson, Ruth F Sommese, Karl J Petersen, Michael Ritt, Joshua Karslake, David D Thomas, Sivaraj Sivaramakrishnan
Protein kinase C α (PKCα) is a nodal regulator in several intracellular signaling networks. PKCα is composed of modular domains that interact with each other to dynamically regulate spatial-temporal function. We find that PKCα specifically, rapidly and reversibly self-assembles in the presence of calcium in vitro. This phenomenon is dependent on, and can be modulated by an intramolecular interaction between the C1a and C2 protein domains of PKCα. Next, we monitor self-assembly of PKC-mCitrine fusion proteins using time-resolved and steady-state homoFRET...
2016: PloS One
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