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https://www.readbyqxmd.com/read/28428821/genome-wide-search-for-candidate-genes-for-yeast-robustness-improvement-against-formic-acid-reveals-novel-susceptibility-trk1-and-positive-regulators-and-resistance-haa1-regulon-determinants
#1
Sílvia F Henriques, Nuno P Mira, Isabel Sá-Correia
BACKGROUND: Formic acid is an inhibitory compound present in lignocellulosic hydrolysates. Understanding the complex molecular mechanisms underlying Saccharomyces cerevisiae tolerance to this weak acid at the system level is instrumental to guide synthetic pathway engineering for robustness improvement of industrial strains envisaging their use in lignocellulosic biorefineries. RESULTS: This study was performed to identify, at a genome-wide scale, genes whose expression confers protection or susceptibility to formic acid, based on the screening of a haploid deletion mutant collection to search for these phenotypes in the presence of 60, 70 and 80 mM of this acid, at pH 4...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28425222/class-iii-antiarrhythmic-drugs-amiodarone-and-dronedarone-impair-kir-2-1-backward-trafficking
#2
Yuan Ji, Hiroki Takanari, Muge Qile, Lukas Nalos, Marien J C Houtman, Fee L Romunde, Raimond Heukers, Paul M P van Bergen En Henegouwen, Marc A Vos, Marcel A G van der Heyden
Drug-induced ion channel trafficking disturbance can cause cardiac arrhythmias. The subcellular level at which drugs interfere in trafficking pathways is largely unknown. KIR 2.1 inward rectifier channels, largely responsible for the cardiac inward rectifier current (IK1 ), are degraded in lysosomes. Amiodarone and dronedarone are class III antiarrhythmics. Chronic use of amiodarone, and to a lesser extent dronedarone, causes serious adverse effects to several organs and tissue types, including the heart. Both drugs have been described to interfere in the late-endosome/lysosome system...
April 19, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28420736/deciphering-the-regulatory-network-between-the-srebp-pathway-and-protein-secretion-in-neurospora-crassa
#3
Lina Qin, Vincent W Wu, N Louise Glass
Sterol regulatory element binding proteins (SREBPs) are conserved from yeast to mammalian cells and function in the regulation of sterol homeostasis. In fungi, the SREBP pathway has been implicated in the adaptation to hypoxia and in virulence. In Neurospora crassa and Trichoderma reesei, the SREBP pathway also negatively regulates protein secretion under lignocellulolytic conditions. Here we utilized global transcriptional profiling combined with genetic and physiological analyses to address the regulatory link between the SREBP pathway and protein secretion in N...
April 18, 2017: MBio
https://www.readbyqxmd.com/read/28414563/leveraging-stem-cell-homing-for-therapeutic-regeneration
#4
Y Yin, X Li, X T He, R X Wu, H H Sun, F M Chen
Resident stem cell pools in many tissues/organs are responsible not only for tissue maintenance during physiologic turnover but also for the process of wound repair following injury. With inspiration from stem cell trafficking within the body under physiologic and pathologic conditions, recent advances have been made toward inducing stem cell mobilization and directing patients' own cells to sites of interest for treating a broad spectrum of diseases. An evolving body of work corroborates that delivering guidance cues can mobilize stem cells from the bone marrow and drive these cells toward a specific region...
April 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28411409/dynamic-imaging-of-ampa-receptor-trafficking-in-vitro-and-in-vivo
#5
REVIEW
Richard H Roth, Yong Zhang, Richard L Huganir
Modulation of synaptic strength through trafficking of AMPA receptors is a fundamental mechanism underlying synaptic plasticity and has been shown to be an important process in higher brain functions such as learning and memory. Many studies have used live time-lapse imaging of fluorescently tagged AMPA receptors to directly monitor their membrane trafficking in the basal state as well as during synaptic plasticity. While most of these studies are performed in vitro using neuronal cell cultures, in the past years technological advances have enabled the imaging of synaptic proteins in vivo in intact organisms...
April 12, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28408492/cd81-as-a-tumor-target
#6
REVIEW
Felipe Vences-Catalán, Caroline Duault, Chiung-Chi Kuo, Ranjani Rajapaksa, Ronald Levy, Shoshana Levy
CD81 participates in a variety of important cellular processes such as membrane organization, protein trafficking, cellular fusion and cell-cell interactions. In the immune system, CD81 regulates immune synapse, receptor clustering and signaling; it also mediates adaptive and innate immune suppression. CD81 is a gateway in hepatocytes for pathogens such as hepatitis C virus and Plasmodium; it also confers susceptibility to Listeria infection. These diverse biological roles are due to the tendency of CD81 to associate with other tetraspanins and with cell-specific partner proteins, which provide the cells with a signaling platform...
April 15, 2017: Biochemical Society Transactions
https://www.readbyqxmd.com/read/28408483/o-glcnac-cycling-and-the-regulation-of-nucleocytoplasmic-dynamics
#7
REVIEW
Moriah Eustice, Michelle R Bond, John A Hanover
The dynamic carbohydrate post-translational modification (PTM) O-linked β-N-acetyl glucosamine (O-GlcNAc) is found on thousands of proteins throughout the nucleus and cytoplasm, and rivals phosphorylation in terms of the number of substrates and pathways influenced. O-GlcNAc is highly conserved and essential in most organisms, with disruption of O-GlcNAc cycling linked to diseases ranging from cancer to neurodegeneration. Nuclear pore proteins were the first identified O-GlcNAc-modified substrates, generating intense and ongoing interest in understanding the role of O-GlcNAc cycling in nuclear pore complex structure and function...
April 15, 2017: Biochemical Society Transactions
https://www.readbyqxmd.com/read/28407494/vaccine-nanocarriers-coupling-intracellular-pathways-and-cellular-biodistribution-to-control-cd4-vs-cd8-t-cell-responses
#8
Marcela Rincon-Restrepo, Aaron Mayer, Sylvie Hauert, Daniel K Bonner, Edward A Phelps, Jeffrey A Hubbell, Melody A Swartz, Sachiko Hirosue
Nanoparticle delivery systems are known to enhance the immune response to soluble antigens (Ags) and are thus a promising tool for the development of new vaccines. Our laboratory has engineered two different nanoparticulate systems in which Ag is either encapsulated within the core of polymersomes (PSs) or decorated onto the surface of nanoparticles (NPs). Previous studies showed that PSs are better at enhancing CD4 T cells and antibody titers, while NPs preferentially augment cytotoxic CD8 T cells. Herein, we demonstrate that the differential activation of T cell immunity reflects differences in the modes of intracellular trafficking and distinct biodistribution of the Ag in lymphoid organs, which are both driven by the properties of each nanocarrier...
March 30, 2017: Biomaterials
https://www.readbyqxmd.com/read/28399904/separation-of-photoreceptor-cell-compartments-in-mouse-retina-for-protein-analysis
#9
Kasey Rose, Steven T Walston, Jeannie Chen
BACKGROUND: Light exposure triggers movement of certain signaling proteins within the cellular compartments of the highly polarized rod photoreceptor cell. This redistribution of proteins between the inner and outer segment compartments affects the performance and physiology of the rod cell. In addition, newly synthesized phototransduction proteins traverse from the site of their synthesis in the inner segment, through the thin connecting cilium, to reach their destination in the outer segment...
April 11, 2017: Molecular Neurodegeneration
https://www.readbyqxmd.com/read/28394150/mental-health-services-as-a-vital-component-of-psychosocial-recovery-for-victims-of-child-trafficking-for-commercial-sexual-exploitation
#10
Yvonne Rafferty
There has been a plethora of outcomes associated with child trafficking for commercial sexual exploitation; however little attention has been paid to how outcomes are addressed for children who are placed into residential aftercare recovery programs following their identification as victims. Field-based qualitative research was undertaken in South and Southeast Asia, and involved interviews with 213 representatives from U.N. and governmental agencies, nongovernmental organizations, and residential aftercare recovery programs...
April 10, 2017: American Journal of Orthopsychiatry
https://www.readbyqxmd.com/read/28379694/protein-tunnels-the-case-of-urease-accessory-proteins
#11
Francesco Musiani, Dario Gioia, Matteo Masetti, Federico Falchi, Andrea Cavalli, Maurizio Recanatini, Stefano Ciurli
Transition metals are both essential micronutrients and limited in environmental availability. The Ni(II)-dependent urease protein, the most efficient enzyme known to date, is a paradigm for studying the strategies that cells use to handle an essential, yet toxic, metal ion. Urease is a virulence factor of several human pathogens, in addition to decreasing the efficiency of soil organic nitrogen fertilization. Ni(II) insertion in the urease active site is performed through the action of three essential accessory proteins: UreD, UreF, and UreG...
April 5, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28377289/golgi-trafficking-defects-in-postnatal-microcephaly-the-evidence-for-golgipathies
#12
REVIEW
Sandrine Passemard, Franck Perez, Emilie Colin-Lemesre, Sowmyalakshmi Rasika, Pierre Gressens, Vincent El Ghouzzi
The Golgi apparatus plays a central role in cell homeostasis, not only in processing and maturing newly synthesized proteins and lipids but also in orchestrating their sorting, packing, routing and recycling on the way to their final destination. These multiple secretory pathways require a complex ballet of vesicular and tubular carriers that continuously bud off from donor membranes and fuse to acceptor membranes. Membrane trafficking is particularly prominent in axons, where cargo molecules have a long way to travel before they reach the synapse, and in oligodendrocytes, which require an immense increase in membrane surface in order to sheathe axons in myelin...
April 1, 2017: Progress in Neurobiology
https://www.readbyqxmd.com/read/28377049/the-endocytic-pathways-of-a-secretory-granule-membrane-protein-in-hek293-cells-pam-and-egf-traverse-a-dynamic-multivesicular-body-network-together
#13
Nils Bäck, Kristiina Kanerva, Vishwanatha Kurutihalli, Andrew Yanik, Elina Ikonen, Richard E Mains, Betty A Eipper
Peptidylglycine α-amidating monooxygenase (PAM) is highly expressed in neurons and endocrine cells, where it catalyzes one of the final steps in the biosynthesis of bioactive peptides. PAM is also expressed in unicellular organisms such as Chlamydomonas reinhardtii, which do not store peptides in secretory granules. As for other granule membrane proteins, PAM is retrieved from the cell surface and returned to the trans-Golgi network. This pathway involves regulated entry of PAM into multivesicular body intralumenal vesicles (ILVs)...
March 28, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28373552/phosphatidylinositol-3-phosphate-binding-protein-atph1-controls-the-localization-of-the-metal-transporter-nramp1-in-arabidopsis
#14
Astrid Agorio, Jérôme Giraudat, Michele Wolfe Bianchi, Jessica Marion, Christelle Espagne, Loren Castaings, Françoise Lelièvre, Catherine Curie, Sébastien Thomine, Sylvain Merlot
"Too much of a good thing" perfectly describes the dilemma that living organisms face with metals. The tight control of metal homeostasis in cells depends on the trafficking of metal transporters between membranes of different compartments. However, the mechanisms regulating the location of transport proteins are still largely unknown. Developing Arabidopsis thaliana seedlings require the natural resistance-associated macrophage proteins (NRAMP3 and NRAMP4) transporters to remobilize iron from seed vacuolar stores and thereby acquire photosynthetic competence...
April 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28369040/phosphorylated-glycosphingolipids-essential-for-cholesterol-mobilization-in-caenorhabditis-elegans
#15
Sebastian Boland, Ulrike Schmidt, Vyacheslav Zagoriy, Julio L Sampaio, Raphael F Fritsche, Regina Czerwonka, Tilo Lübken, Jakob Reimann, Sider Penkov, Hans-Joachim Knölker, Teymuras V Kurzchalia
The nematode Caenorhabditis elegans requires exogenous cholesterol to survive and its depletion leads to early developmental arrest. Thus, tight regulation of cholesterol storage and distribution within the organism is indispensable. Here, we present a novel class of C. elegans phosphorylated glycosphingolipids, phosphoethanolamine glucosylceramides (PEGCs), capable of rescuing larval arrest induced by sterol starvation. We describe the total synthesis of a major PEGC species and demonstrate that the PEGC synthetic counterpart suppresses the dauer-constitutive phenotype of Niemann-Pick C1 (NPC1) and DAF-7/TGF-β mutant worms caused by impaired intracellular sterol trafficking...
April 3, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28360839/emerging-roles-for-glycogen-in-the-cns
#16
REVIEW
Alice E Waitt, Liam Reed, Bruce R Ransom, Angus M Brown
The ability of glycogen, the depot into which excess glucose is stored in mammals, to act as a source of rapidly available energy substrate, has been exploited by several organs for both general and local advantage. The liver, expressing the highest concentration of glycogen maintains systemic normoglycemia ensuring the brain receives a supply of glucose in excess of demand. However the brain also contains glycogen, although its role is more specialized. Brain glycogen is located exclusively in astrocytes in the adult, with the exception of pathological conditions, thus in order to benefit neurons, and energy conduit (lactate) is trafficked inter-cellularly...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28356527/chemokine-receptor-ccr7-restricts-fatal-west-nile-virus-encephalitis
#17
Susana V Bardina, Julia A Brown, Daniela Michlmayr, Kevin W Hoffman, Janet Sum, Alexander G Pletnev, Sergio A Lira, Jean K Lim
West Nile virus (WNV) is a mosquito-transmitted flavivirus that can cause debilitating encephalitis. To delineate the mechanisms behind this pathology, we studied Ccr7-deficient mice, which afforded us the capacity to study infection in mice with disrupted peripheral cellular trafficking events. The loss of Ccr7 resulted in an immediate pan-leukocytosis that remained elevated throughout the infection. This leukocytosis resulted in a significant enhancement of leukocyte accumulation within the CNS. Despite an excess of virus-specific T cells in the CNS, Ccr7-deficient mice had significantly higher CNS viral loads and mortality rates compared to wild-type animals...
March 29, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28356223/the-role-of-the-pi-3-5-p2-kinase-tbfab1-in-endo-lysosomal-trafficking-in-trypanosoma-brucei
#18
Julia K Gilden, Khan Umaer, Emilia K Kruzel, Oliver Hecht, Renan O Correa, John M Mansfield, James D Bangs
Protein trafficking through endo/lysosomal compartments is critically important to the biology of the protozoan parasite Trypanosoma brucei, but the routes material may take to the lysosome, as well as the molecular factors regulating those routes, remain incompletely understood. Phosphoinositides are signaling phospholipids that regulate many trafficking events by recruiting specific effector proteins to discrete membrane subdomains. In this study, we investigate the role of one phosphoinositide, PI(3,5)P2 in T...
March 27, 2017: Molecular and Biochemical Parasitology
https://www.readbyqxmd.com/read/28352656/trafficking-receptor-signatures-define-blood-plasmablasts-responding-to-tissue-specific-immune-challenge
#19
Yekyung Seong, Nicole H Lazarus, Lusijah Sutherland, Aida Habtezion, Tzvia Abramson, Xiao-Song He, Harry B Greenberg, Eugene C Butcher
Antibody-secreting cells are generated in regional lymphoid tissues and traffic as plasmablasts (PBs) via lymph and blood to target sites for local immunity. We used multiparameter flow cytometry to define PB trafficking programs (TPs, combinations of adhesion molecules and chemoattractant receptors) and their imprinting in patients in response to localized infection or immune insults. TPs enriched after infection or autoimmune inflammation of mucosae correlate with sites of immune response or symptoms, with different TPs imprinted during small intestinal, colon, throat, and upper respiratory immune challenge...
March 23, 2017: JCI Insight
https://www.readbyqxmd.com/read/28349968/neural-crest-cells-contribute-an-astrocyte-like-glial-population-to-the-spleen
#20
Amanda J Barlow-Anacker, Ming Fu, Christopher S Erickson, Federica Bertocchini, Ankush Gosain
Neural crest cells (NCC) are multi-potent cells of ectodermal origin that colonize diverse organs, including the gastrointestinal tract to form the enteric nervous system (ENS) and hematopoietic organs (bone marrow, thymus) where they participate in lymphocyte trafficking. Recent studies have implicated the spleen as an anatomic site for integration of inflammatory signals from the intestine with efferent neural inputs. We have previously observed alterations in splenic lymphocyte subsets in animals with defective migration of NCC that model Hirschsprung's disease, leading us to hypothesize that there may be a direct cellular contribution of NCC to the spleen...
March 28, 2017: Scientific Reports
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