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https://www.readbyqxmd.com/read/27913662/direct-functional-interaction-of-the-kinesin-13-family-member-kinesin-like-protein-2a-kif2a-and-arf-gap-with-gtp-binding-protein-like-ankyrin-repeats-and-ph-domains-1-agap1
#1
Ruibai Luo, Pei-Wen Chen, Michael Wagenbach, Xiaoying Jian, Lisa Jenkins, Linda Wordeman, Paul A Randazzo
No abstract text is available yet for this article.
December 2, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27911799/mechanism-of-the-intrinsic-arginine-finger-in-heterotrimeric-g-proteins
#2
Daniel Mann, Christian Teuber, Stefan A Tennigkeit, Grit Schröter, Klaus Gerwert, Carsten Kötting
Heterotrimeric G proteins are crucial molecular switches that maintain a large number of physiological processes in cells. The signal is encoded into surface alterations of the Gα subunit that carries GTP in its active state and GDP in its inactive state. The ability of the Gα subunit to hydrolyze GTP is essential for signal termination. Regulator of G protein signaling (RGS) proteins accelerates this process. A key player in this catalyzed reaction is an arginine residue, Arg178 in Gαi1, which is already an intrinsic part of the catalytic center in Gα in contrast to small GTPases, at which the corresponding GTPase-activating protein (GAP) provides the arginine "finger...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27911731/insights-into-the-post-transcriptional-regulation-of-the-mitochondrial-electron-transport-chain
#3
REVIEW
Tamara M Sirey, Chris P Ponting
The regulation of the mitochondrial electron transport chain is central to the control of cellular homeostasis. There are significant gaps in our understanding of how the expression of the mitochondrial and nuclear genome-encoded components of the electron transport chain are co-ordinated, and how the assembly of the protein complexes that constitute the electron transport chain are regulated. Furthermore, the role post-transcriptional gene regulation may play in modulating these processes needs to be clarified...
October 15, 2016: Biochemical Society Transactions
https://www.readbyqxmd.com/read/27907211/characterization-and-immunomodulatory-effects-of-canine-adipose-tissue-and-bone-marrow-derived-mesenchymal-stromal-cells
#4
Keith A Russell, Natalie H C Chow, David Dukoff, Thomas W G Gibson, Jonathan LaMarre, Dean H Betts, Thomas G Koch
BACKGROUND: Mesenchymal stromal cells (MSC) hold promise for both cell replacement and immune modulation strategies owing to their progenitor and non-progenitor functions, respectively. Characterization of MSC from different sources is an important and necessary step before clinical use of these cells is widely adopted. Little is known about the biology and function of canine MSC compared to their mouse or human counterparts. This knowledge-gap impedes development of canine evidence-based MSC technologies...
2016: PloS One
https://www.readbyqxmd.com/read/27905396/atomic-structure-of-the-innexin-6-gap-junction-channel-determined-by-cryo-em
#5
Atsunori Oshima, Kazutoshi Tani, Yoshinori Fujiyoshi
Innexins, a large protein family comprising invertebrate gap junction channels, play an essential role in nervous system development and electrical synapse formation. Here we report the cryo-electron microscopy structures of Caenorhabditis elegans innexin-6 (INX-6) gap junction channels at atomic resolution. We find that the arrangements of the transmembrane helices and extracellular loops of the INX-6 monomeric structure are highly similar to those of connexin-26 (Cx26), despite the lack of significant sequence similarity...
December 1, 2016: Nature Communications
https://www.readbyqxmd.com/read/27903653/the-phosphatidylinositol-3-4-5-trisphosphate-pi-3-4-5-p3-binder-rasa3-regulates-phosphoinositide-3-kinase-pi-3-kinase-dependent-integrin-%C3%AE-iib%C3%AE-3-outside-in-signaling
#6
Anthony M Battram, Tom N Durrant, Ejaife O Agbani, Kate J Heesom, David S Paul, Raymond Piatt, Alastair W Poole, Peter J Cullen, Wolfgang Bergmeier, Samantha F Moore, Ingeborg Hers
The class I phosphoinositide 3-kinase (PI 3-kinase) family of lipid kinases plays an important role in integrin αIIbβ3 function, thereby supporting thrombus growth and consolidation. Here, we identify the Ras/Rap1GAP Rasa3 (GAP1IP4BP) as a major phosphatidylinositol-3,4,5-trisphosphate (PI(3,4,5)P3)-binding protein in human platelets and a key regulator of integrin αIIbβ3 outside-in signaling. We demonstrate that cytosolic Rasa3 translocates to the plasma membrane in a PI 3kinase-dependent manner upon activation of human platelets...
November 30, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27902364/markers-of-dengue-severity-systematic-review-of-cytokines-and-chemokines
#7
Yie Hou Lee, Wei Yee Leong, Annelies Wilder-Smith
Prognosis of dengue remains a challenge in allowing the early, objective triage of patients with dengue fever of differing severity. Circulating immuno-modulating proteins have brought new possibilities as prognostic markers of severe dengue. The systematic review is devoted to understanding the potential utility of blood-based cytokines and chemokines as prognostication markers of severe dengue based on current literature. PUBMED and EMBASE were searched. Of 794 candidate articles, 685 abstracts were screened against our exclusion/inclusion criteria and 25 (3...
October 21, 2016: Journal of General Virology
https://www.readbyqxmd.com/read/27899653/control-of-the-negative-ires-trans-acting-factor-khsrp-by-ubiquitination
#8
Yu-An Kung, Chuan-Tien Hung, Kun-Yi Chien, Shin-Ru Shih
Cells and viruses can utilize internal ribosome entry sites (IRES) to drive translation when cap-dependent translation is inhibited by stress or viral factors. IRES trans-acting factors (ITAFs) are known to participate in such cap-independent translation, but there are gaps in the understanding as to how ITAFs, particularly negative ITAFs, regulate IRES-driven translation. This study found that Lys109, Lys121 and Lys122 represent critical ubiquitination sites for far upstream element-binding protein 2 (KHSRP, also known as KH-type splicing regulatory protein or FBP2), a negative ITAF...
November 28, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27899616/the-tissuenet-v-2-database-a-quantitative-view-of-protein-protein-interactions-across-human-tissues
#9
Omer Basha, Ruth Barshir, Moran Sharon, Eugene Lerman, Binyamin F Kirson, Idan Hekselman, Esti Yeger-Lotem
Knowledge of the molecular interactions of human proteins within tissues is important for identifying their tissue-specific roles and for shedding light on tissue phenotypes. However, many protein-protein interactions (PPIs) have no tissue-contexts. The TissueNet database bridges this gap by associating experimentally-identified PPIs with human tissues that were shown to express both pair-mates. Users can select a protein and a tissue, and obtain a network view of the query protein and its tissue-associated PPIs...
November 29, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27899583/xtalkdb-a-database-of-signaling-pathway-crosstalk
#10
Sarah A Sam, Joelle Teel, Allison N Tegge, Aditya Bharadwaj, T M Murali
Analysis of signaling pathways and their crosstalk is a cornerstone of systems biology. Thousands of papers have been published on these topics. Surprisingly, there is no database that carefully and explicitly documents crosstalk between specific pairs of signaling pathways. We have developed XTalkDB (http://www.xtalkdb.org) to fill this very important gap. XTalkDB contains curated information for 650 pairs of pathways from over 1600 publications. In addition, the database reports the molecular components (e...
November 28, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27899284/defective-lymphatic-valve-development-and-chylothorax-in-mice-with-a-lymphatic-specific-deletion-of-connexin43
#11
Stephanie J Munger, Michael J Davis, Alexander M Simon
Lymphatic valves (LVs) are cusped luminal structures that permit the movement of lymph in only one direction and are therefore critical for proper lymphatic vessel function. Congenital valve aplasia or agenesis can, in some cases, be a direct cause of lymphatic disease. Knowledge about the molecular mechanisms operating during the development and maintenance of LVs may thus aid in the establishment of novel therapeutic approaches to treat lymphatic disorders. In this study, we examined the role of Connexin43 (Cx43), a gap junction protein expressed in lymphatic endothelial cells (LECs), during valve development...
November 26, 2016: Developmental Biology
https://www.readbyqxmd.com/read/27899102/bridging-the-gap-to-therapeutic-strategies-based-on-connexin-pannexin-biology
#12
Christian C Naus, Christian Giaume
A unique workshop was recently held focusing on enhancing collaborations leading to identify and update the development of therapeutic strategies targeting connexin/pannexin large pore channels. Basic scientists exploring the functions of these channels in various pathologies gathered together with leading pharma companies which are targeting gap junction proteins for specific therapeutic applications. This highlights how paths of discovery research can converge with therapeutic strategies in innovative ways to enhance target identification and validation...
November 29, 2016: Journal of Translational Medicine
https://www.readbyqxmd.com/read/27898695/dcite-measuring-necessary-cladistic-information-can-help-you-reduce-polytomy-artefacts-in-trees
#13
Michael J Wise
Biologists regularly create phylogenetic trees to better understand the evolutionary origins of their species of interest, and often use genomes as their data source. However, as more and more incomplete genomes are published, in many cases it may not be possible to compute genome-based phylogenetic trees due to large gaps in the assembled sequences. In addition, comparison of complete genomes may not even be desirable due to the presence of horizontally acquired and homologous genes. A decision must therefore be made about which gene, or gene combinations, should be used to compute a tree...
2016: PloS One
https://www.readbyqxmd.com/read/27896589/lipid-nanoparticles-loaded-with-an-antisense-oligonucleotide-gapmer-against-bcl-2-for-treatment-of-lung-cancer
#14
Xinwei Cheng, Qibing Liu, Hong Li, Chen Kang, Yang Liu, Tianqi Guo, Ke Shang, Chengyun Yan, Guang Cheng, Robert J Lee
PURPOSE: Bcl-2 is an anti-apoptotic gene that is frequently overexpressed in human cancers. G3139 is an antisense oligonucleotide against bcl-2 that has shown limited efficacy in clinical trials. Here, we report the synthesis of a new antisense oligonucleotide containing additional chemical modifications and its delivery using nanoparticles. METHODS: An oligonucleotide G3139-GAP was synthesized, which has 2'-O-methyl nucleotides at the 5' and 3' ends based on a "gapmer" design...
November 28, 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27895927/expansion-mosaicism-and-interruption-mechanisms-of-the-cag-repeat-mutation-in-spinocerebellar-ataxia-type-1
#15
REVIEW
Cara Kraus-Perrotta, Sarita Lagalwar
Spinocerebellar ataxia type 1 (SCA1) is an autosomal dominant neurodegenerative disorder that primarily affects the cerebellum and brainstem. The genetic mutation is an expansion of CAG trinucleotide repeats within the coding region of the ataxin-1 gene, characterizing SCA1 as a polyglutamine expansion disease like Huntington's. As with most polyglutamine expansion diseases, SCA1 follows the rules of genetic anticipation: the larger the expansion, the earlier and more rapid the symptoms. Unlike the majority of polyglutamine expansion diseases, the presence of histidine interruptions within the polyglutamine tract of ataxin-1 protein can prevent or mitigate disease...
2016: Cerebellum & Ataxias
https://www.readbyqxmd.com/read/27895706/whole-genome-metabolic-model-of-trichoderma-reesei-built-by-comparative-reconstruction
#16
Sandra Castillo, Dorothee Barth, Mikko Arvas, Tiina M Pakula, Esa Pitkänen, Peter Blomberg, Tuulikki Seppanen-Laakso, Heli Nygren, Dhinakaran Sivasiddarthan, Merja Penttilä, Merja Oja
BACKGROUND: Trichoderma reesei is one of the main sources of biomass-hydrolyzing enzymes for the biotechnology industry. There is a need for improving its enzyme production efficiency. The use of metabolic modeling for the simulation and prediction of this organism's metabolism is potentially a valuable tool for improving its capabilities. An accurate metabolic model is needed to perform metabolic modeling analysis. RESULTS: A whole-genome metabolic model of T. reesei has been reconstructed together with metabolic models of 55 related species using the metabolic model reconstruction algorithm CoReCo...
2016: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/27893988/endothelin-signaling-in-bone
#17
REVIEW
Jasmin Kristianto, Michael G Johnson, Rafia Afzal, Robert D Blank
The endothelin (ET) system includes 3 small peptide hormones and a pair of G protein-coupled receptors. All 3 ETs are secreted as biologically inert precursors that must be activated by proteolytic cleavage after secretion. This reaction can be catalyzed by a pair of specific, membrane-bound extracellular ET converting enzymes or by nonspecific tissue proteases. The ET1/EDNRA axis is essential in development, with knockout mice for either displaying a similar phenotype featuring multiple defects of the craniofacial skeleton and cardiac outflow tract...
November 11, 2016: Translational Research: the Journal of Laboratory and Clinical Medicine
https://www.readbyqxmd.com/read/27892529/a-peptidoglycan-recognition-protein-acts-in-whitefly-bemisia-tabaci-immunity-and-involves-in-begomovirus-acquisition
#18
Zhi-Zhi Wang, Min Shi, Yi-Cun Huang, Xiao-Wei Wang, David Stanley, Xue-Xin Chen
Peptidoglycan recognition proteins (PGRPs) are multifunctional pattern recognition proteins. Here, we report that a PGRP gene, BtPGRP, encodes a PGRP from the whitefly Bemisia tabaci (MEAM1) that binds and kills bacteria in vitro. We analyzed BtPGRP transcriptional profiling, and the distribution of the cognate protein within the midgut. Fungal infection and wasp parasitization induced expression of BtPGRP. Silencing BtPGRP with artificial media amended with dsRNA led to reduced expression of a gene encoding an antimicrobial peptide, B...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27888240/topological-organisation-of-the-phosphatidylinositol-4-5-bisphosphate-phospholipase-c-resynthesis-cycle-pitps-bridge-the-er-pm-gap
#19
REVIEW
Shamshad Cockcroft, Padinjat Raghu
Phospholipase C (PLC) is a receptor-regulated enzyme that hydrolyses phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) at the plasma membrane (PM) triggering three biochemical consequences, the generation of soluble inositol 1,4,5-trisphosphate (IP3), membrane-associated diacylglycerol (DG) and the consumption of PM PI(4,5)P2 Each of these three signals triggers multiple molecular processes impacting key cellular properties. The activation of PLC also triggers a sequence of biochemical reactions, collectively referred to as the PI(4,5)P2 cycle that culminates in the resynthesis of this lipid...
December 1, 2016: Biochemical Journal
https://www.readbyqxmd.com/read/27886223/redox-cofactors-insertion-in-prokaryotic-molybdoenzymes-occurs-via-a-conserved-folding-mechanism
#20
Rodrigo Arias-Cartin, Pierre Ceccaldi, Barbara Schoepp-Cothenet, Klaudia Frick, Jean-Michel Blanc, Bruno Guigliarelli, Anne Walburger, Stéphane Grimaldi, Thorsten Friedrich, Véronique Receveur-Brechot, Axel Magalon
A major gap of knowledge in metalloproteins is the identity of the prefolded state of the protein before cofactor insertion. This holds for molybdoenzymes serving multiple purposes for life, especially in energy harvesting. This large group of prokaryotic enzymes allows for coordination of molybdenum or tungsten cofactors (Mo/W-bisPGD) and Fe/S clusters. Here we report the structural data on a cofactor-less enzyme, the nitrate reductase respiratory complex and characterize the conformational changes accompanying Mo/W-bisPGD and Fe/S cofactors insertion...
November 25, 2016: Scientific Reports
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