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outer membrane protein analysis

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https://www.readbyqxmd.com/read/28202758/endogenous-brain-lipids-inhibit-prion-amyloid-formation-in-vitro
#1
Clare E Hoover, Kristen A Davenport, Davin M Henderson, Mark D Zabel, Edward A Hoover
The normal cellular prion protein (PrP(C)) resides in detergent-resistant outer membrane lipid rafts in which conversion to the pathogenic misfolded form is believed to occur. Once misfolding occurs, the pathogenic isoform polymerizes into highly stable amyloid fibrils. In vitro assays have demonstrated an intimate association between prion conversion and lipids, specifically phosphatidylethanolamine, which is a critical cofactor in the formation of synthetic infectious prions. In the current work, we demonstrate an alternative inhibitory function of lipids in the prion conversion process as assessed in vitro by real-time, quaking induced conversion (RT-QuIC)...
February 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28184355/spiroplasma-eriocheiris-adhesin-like-protein-alp-interacts-with-epidermal-growth-factor-egf-domain-proteins-to-facilitate-infection
#2
Libo Hou, Yuhan Liu, Qi Gao, Xuechuan Xu, Mingxiao Ning, Jingxiu Bi, Hui Liu, Min Liu, Wei Gu, Wen Wang, Qingguo Meng
Spiroplasma eriocheiris is a novel pathogen found in recent years, causing the tremor disease (TD) of Chinese mitten crab Eriocheir sinensis. Like Spiroplasma mirum, S. eriocheiris infects the newborn mouse (adult mice are not infected) and can cause cataract. Adhesion-related protein is an important protein involved in the interaction between pathogen and host. In this study, the Adhesin-like Protein (ALP) of S. eriocheiris was detected on its outer membrane by using immune electron microscopy, and was found to be involved in the bacterium's infection of mouse embryo fibroblasts (3T6-Swiss albino)...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28182867/disordered-clusters-of-bak-dimers-rupture-mitochondria-during-apoptosis
#3
Rachel T Uren, Martin O'Hely, Sweta Iyer, Ray Bartolo, Melissa X Shi, Jason M Brouwer, Amber E Alsop, Grant Dewson, Ruth M Kluck
During apoptosis, Bak and Bax undergo major conformational change and form symmetric dimers that coalesce to perforate the mitochondrial outer membrane via an unknown mechanism. We have employed cysteine labelling and linkage analysis to the full length of Bak in mitochondria. This comprehensive survey showed that in each Bak dimer the N-termini are fully solvent-exposed and mobile, the core is highly structured, and the C-termini are flexible but restrained by their contact with the membrane. Dimer-dimer interactions were more labile than the BH3:groove interaction within dimers, suggesting there is no extensive protein interface between dimers...
February 6, 2017: ELife
https://www.readbyqxmd.com/read/28177769/a-deletion-variant-partially-complements-a-porin-less-strain-of-i-neurospora-crassa-i
#4
Fraser G Ferens, Victor Spicer, Oleg V Krokhin, Anna Motnenko, William A T Summers, Deborah A Court
Mitochondrial porin, the voltage-dependent anion channel, plays an important role in metabolism and other cellular functions within eukaryotic cells. To further the understanding of porin structure and function, <i>Neurospora crassa</i> wild-type porin was replaced with a deletion variant lacking residues 238-242 (238porin). 238porin was assembled in the mitochondrial outer membrane, but the steady state levels were only about 3% of those of the wild-type protein. The strain harbouring 238porin displayed cytochrome deficiencies and expressed alternative oxidase...
November 2, 2016: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/28167535/adaptation-of-a-genetic-screen-reveals-an-inhibitor-for-mitochondrial-protein-import-component-tim44
#5
Non Miyata, Zhiye Tang, Michael A Conti, Meghan E Johnson, Colin J Douglas, Samuel A Hasson, Robert Damoiseaux, Chia-En A Chang, Carla M Koehler
Diverse protein import pathways into mitochondria use translocons on the outer membrane (TOM) and inner membrane (TIM). We adapted a genetic screen, based on Ura3 mistargeting from mitochondria to the cytosol, to identify small molecules that attenuated protein import. Small molecule Mitochondrial import Blockers of the Carla Koehler laboratory (MitoBloCK, MB)-10 inhibited import of substrates that require the TIM23 translocon. Mutational analysis coupled with molecular docking and molecular dynamics modeling revealed that MB-10 binds to a specific pocket in the C-terminal domain of Tim44 of the Protein Associated Motor (PAM) complex...
February 6, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28164807/induction-of-b7-h1-receptor-by-bacterial-cells-fractions-of-porphyromonas-gingivalis-on-human-oral-epithelial-cells-b7-h1-induction-by-porphyromonas-gingivalis-fractions
#6
S Groeger, F Jarzina, U Mamat, J Meyle
The immune-regulatory B7-H1 receptor, also known as programmed death-ligand 1 (PD-L1), plays an important role in cell-mediated immune response. It is a co-signaling molecule that mediates regulation of T cell activation and tolerance and is able to negatively regulate activated T cell functions and survival. High expression of B7-H1 in host cells may contribute to the chronicity of inflammatory disorders and represents a possible mechanism of immune evasion. Porphyromonas gingivalis is regarded as a keystone pathogen in periodontitis and is able to invade host cells and disposes a variety of virulence factors including lipopolysaccharide (LPS), fimbriae and proteases such as gingipains...
February 2017: Immunobiology
https://www.readbyqxmd.com/read/28143511/a-novel-salmonella-strain-inactivated-by-a-regulated-autolysis-system-and-expressing-the-b-subunit-of-shiga-toxin-2e-efficiently-elicits-immune-responses-and-confers-protection-against-virulent-stx2e-producing-escherichia-coli
#7
Gayeon Won, Tae Hoon Kim, John Hwa Lee
BACKGROUND: Salmonella Typhimurium (S. Typhimurium) inactivated by a regulated autolysis system was genetically engineered to express the homo-pentameric B subunit of Shiga toxin 2e (Stx2eB) on its surface. To prepare a strain able to yield autolyzed Salmonella bearing Stx2eB, the plasmid pJHL184 harboring stx 2eB gene was transformed into the attenuated S. Typhimurium strain, JOL1454. Stx2eB subcloned into the antigen delivery cassette of the plasmid was expressed as fusion protein with the outer membrane protein RESULTS: The expression of Stx2eB fused to the signal peptide in JOL1454 was validated by immunoblot analysis...
February 1, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28137507/construction-and-evaluation-of-an-edwardsiella-tarda-dna-vaccine-encoding-outer-membrane-protein-c
#8
Fuguo Liu, Xiaoqian Tang, Xiuzhen Sheng, Jing Xing, Wenbin Zhan
Outer membrane protein C is a porin that resides in the outer membrane, and it has been identified as an antigenic protein in many bacteria, such as Escherichia coli, Salmonella typhi, Aeromonas hydrophila and Edwardsiella tarda. In the present work, we aimed at evaluating the immune protective potential of E. tarda OmpC as a DNA vaccine. For this purpose, a recombinant DNA plasmid encoding OmpC (pCG-OmpC) gene was constructed and its vaccine potential was analyzed in a flounder (Paralichthys olivaceus) model...
January 27, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28134781/implications-for-diverse-functions-of-the-linc-complexes-based-on-the-structure
#9
REVIEW
Miki Hieda
The linker of nucleoskeleton and cytoskeleton (LINC) complex is composed of the outer and inner nuclear membrane protein families Klarsicht, Anc-1, and Syne homology (KASH), and Sad1 and UNC-84 (SUN) homology domain proteins. Increasing evidence has pointed to diverse functions of the LINC complex, such as in nuclear migration, nuclear integrity, chromosome movement and pairing during meiosis, and mechanotransduction to the genome. In metazoan cells, the nuclear envelope possesses the nuclear lamina, which is a thin meshwork of intermediate filaments known as A-type and B-type lamins and lamin binding proteins...
January 26, 2017: Cells
https://www.readbyqxmd.com/read/28119513/native-and-foreign-proteins-secreted-by-the-cupriavidus-metallidurans-type-ii-system-and-an-alternative-mechanism
#10
Houjuan Xu, Timothy P Denny
The type II secretion system (T2SS), which transports selected periplasmic proteins across the outer membrane, has rarely been studied in nonpathogens or in organisms classified as betaproteobacteria. Therefore, we studied Cupriavidus metallidurans (Cme), a facultative chemilithoautotroph. Gel analysis of extracellular proteins revealed no remarkable differences between wild type and T2SS mutants. However, enzyme assays revealed that native extracellular alkaline phosphatase is a T2SS substrate, because activity was 10-fold greater for wild-type than a T2SS mutant...
January 24, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28119484/overproduction-of-outer-membrane-protein-a-ompa-by-acinetobacter-baumannii-is-a-risk-factor-for-nosocomial-pneumonia-bacteremia-and-mortality-increase
#11
Viviana Sánchez-Encinales, Rocío Álvarez-Marín, María Eugenia Pachón-Ibáñez, Felipe Fernández-Cuenca, Alvaro Pascual, José Garnacho-Montero, Luis Martínez-Martínez, Jordi Vila, María Mar Tomás, José Miguel Cisneros, Germán Bou, Jesús Rodríguez-Baño, Jerónimo Pachón, Younes Smani
BACKGROUND: OmpA is a porin involved in Acinetobacter baumannii pathogenesis. However, OmpA clinical implication in hospital-acquired infections remains unknown. We aimed to determine whether OmpA overproduction was a risk factor associated with pneumonia, bacteremia, and mortalilty. METHODS: Demographic, microbiological and clinical data from 100 and 246 patients included, respectively, in a unicenter cohort (UC) and a multicenter cohort (MC) were analyzed. Representative isolates were classified in two groups: i-16 UC and 20 MC isolates from colonized patients (CP) by A...
January 24, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28119034/prevalence-of-different-omph-types-among-pasteurella-multocida-isolated-from-lungs-of-calves-with-respiratory-problems
#12
Alexey V Nefedchenko, Tatyana I Glotova, Alexander G Glotov, Vladimir A Ternovoy, Alexandra O Sementsova
Pasteurella multocida is among the most important respiratory pathogens of cattle. Outer-membrane protein (OmpH) constitutes an essential bacterial antigen and is well studied in avian bacterial strains. Studies on isolates from cattle with signs of respiratory disease caused by Pasteurella multocida serotypes A and D have not yet been covered in the literature. The objective of this study was a comparative analysis of the ompH gene sequences from 83 isolates and four Russian reference strains of P. multocida to assign them to the allelic variants of the gene (OmpH-types)...
January 21, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28104494/thoughts-on-interactions-between-pgrmc1-and-diverse-attested-and-potential-hydrophobic-ligands
#13
REVIEW
Michael A Cahill, Amy E Medlock
Progesterone Receptor Membrane Component 1 (PGRMC1) is located in many different subcellular locations with many different attested and probably location-specific functions. PGRMC1 was recently identified in the mitochondrial outer membrane where it interacts with ferrochelatase, the last enzyme in the heme synthetic pathway. It has been proposed that PGRMC1 may act as a chaperone to shuttle newly synthesized heme from the mitochondrion to cytochrome P450 (cyP450) enzymes. Here we consider potential roles that PGRMC1 may play in transferring heme, and other small hydrophobic ligands such as cholesterol and steroids, between the hydrophobic compartment of the membrane lipid bilayer interior to aqueous proteins, and perhaps to the membranes of other organelles...
January 16, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28094338/mitochondrial-protein-import-functional-analysis-of-the-highly-diverged-tom22-orthologue-of-trypanosoma-brucei
#14
Jan Mani, Samuel Rout, Silvia Desy, André Schneider
The β-barrel protein Tom40 and the α-helically anchored membrane protein Tom22 are the only universally conserved subunits of the protein translocase of the mitochondrial outer membrane (TOM). Tom22 has an N-terminal cytosolic and a C-terminal intermembrane space domain. It occurs in two variants: one typified by the yeast protein which has a cytosolic domain containing a cluster of acidic residues, and a shorter variant typified by the plant protein that lacks this domain. Yeast-type Tom22 functions as a secondary protein import receptor and is also required for the stability of the TOM complex...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28077594/the-n-linking-glycosylation-system-from-actinobacillus-pleuropneumoniae-is-required-for-adhesion-and-has-potential-use-in-glycoengineering
#15
Jon Cuccui, Vanessa S Terra, Janine T Bossé, Andreas Naegeli, Sherif Abouelhadid, Yanwen Li, Chia-Wei Lin, Prerna Vohra, Alexander W Tucker, Andrew N Rycroft, Duncan J Maskell, Markus Aebi, Paul R Langford, Brendan W Wren
Actinobacillus pleuropneumoniae is a mucosal respiratory pathogen causing contagious porcine pleuropneumonia. Pathogenesis studies have demonstrated a major role for the capsule, exotoxins and outer membrane proteins. Actinobacillus pleuropneumoniae can also glycosylate proteins, using a cytoplasmic N-linked glycosylating enzyme designated NGT, but its transcriptional arrangement and role in virulence remains unknown. We investigated the NGT locus and demonstrated that the putative transcriptional unit consists of rimO, ngt and a glycosyltransferase termed agt...
January 2017: Open Biology
https://www.readbyqxmd.com/read/28070584/changes-in-protein-expression-profiles-in-bovine-endometrial-epithelial-cells-exposed-to-e-coli-lps-challenge
#16
Cristian Piras, Yongzhi Guo, Alessio Soggiu, Metasu Chanrot, Viviana Greco, Andrea Urbani, Gilles Charpigny, Luigi Bonizzi, Paola Roncada, Patrice Humblot
E. coli is one of the most frequently involved bacteria in uterine diseases. Lipopolysaccharide (LPS) is a component of the outer membrane of Gram-negative bacteria involved in pathogenic processes leading to post-partum metritis and endometritis in cattle. It also causes inflammation of the endometrium. The increase of cell proliferation by LPS is part of the inflammatory process. The aim of this study was to investigate possible changes in protein expression in relation to the proliferative response of bEECs after challenge with E...
January 10, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28069820/comprehensive-spatial-analysis-of-the-borrelia-burgdorferi-lipoproteome-reveals-a-compartmentalization-bias-toward-the-bacterial-surface
#17
Alexander S Dowdell, Maxwell D Murphy, Christina Azodi, Selene K Swanson, Laurence Florens, Shiyong Chen, Wolfram R Zückert
: The Lyme disease spirochete Borrelia burgdorferi is unique among bacteria in its large number of lipoproteins that are encoded by a small, exceptionally fragmented and predominantly linear genome. Peripherally anchored in either the inner or outer membrane and facing either the periplasm or the external environment, these lipoproteins assume varied roles. A prominent subset functioning as the apparent linchpins of the enzootic tick-vertebrate infection cycle has been explored as vaccine targets...
January 9, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28069648/the-acinetobacter-outer-membrane-contains-multiple-specific-channels-for-carbapenem-%C3%AE-lactams-as-revealed-by-kinetic-characterization-analyses-of-imipenem-permeation-into-acinetobacter-baylyi-cells
#18
Jorgelina Morán-Barrio, María M Cameranesi, Verónica Relling, Adriana S Limansky, Luciano Brambilla, Alejandro M Viale
The number and type of outer membrane (OM) channels responsible of carbapenem uptake in Acinetobacter are still not well defined. Here, we addressed these questions using Acinetobacter baylyi as a model species and a combination of methodologies aimed to characterize OM channels in their original membrane environment. Kinetic and competition analyses of imipenem (IPM) uptake by A. baylyi whole cells allowed us to identify different carbapenem-specific OM uptake sites. Comparative analyses of IPM uptake by A...
January 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28061865/proteomic-analysis-of-enterotoxigenic-escherichia-coli-etec-in-neutral-and-alkaline-conditions
#19
Lucia Gonzales-Siles, Roger Karlsson, Diarmuid Kenny, Anders Karlsson, Åsa Sjöling
BACKGROUND: Enterotoxigenic Escherichia coli (ETEC) is a major cause of diarrhea in children and travelers to endemic areas. Secretion of the heat labile AB5 toxin (LT) is induced by alkaline conditions. In this study, we determined the surface proteome of ETEC exposed to alkaline conditions (pH 9) as compared to neutral conditions (pH 7) using a LPI Hexalane FlowCell combined with quantitative proteomics. Relative quantitation with isobaric labeling (TMT) was used to compare peptide abundance and their corresponding proteins in multiple samples at MS/MS level...
January 7, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28054667/yersinia-pestis-halotolerance-illuminates-plague-reservoirs
#20
Maliya Alia Malek, Idir Bitam, Anthony Levasseur, Jérôme Terras, Jean Gaudart, Said Azza, Christophe Flaudrops, Catherine Robert, Didier Raoult, Michel Drancourt
The plague agent Yersinia pestis persists for years in the soil. Two millennia after swiping over Europe and North Africa, plague established permanent foci in North Africa but not in neighboring Europe. Mapping human plague foci reported in North Africa for 70 years indicated a significant location at <3 kilometers from the Mediterranean seashore or the edge of salted lakes named chotts. In Algeria, culturing 352 environmental specimens naturally containing 0.5 to 70 g/L NaCl yielded one Y. pestis Orientalis biotype isolate in a 40 g/L NaCl chott soil specimen...
January 5, 2017: Scientific Reports
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