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Bacterial signal transduction

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https://www.readbyqxmd.com/read/29454809/the-hidden-lipoproteome-of-staphylococcus-aureus
#1
Anica Graf, Richard J Lewis, Stephan Fuchs, Martin Pagels, Susanne Engelmann, Katharina Riedel, Jan Pané-Farré
Lipoproteins are attached to the outer leaflet of the membrane by a di- or tri-acylglyceryl moiety and are thus positioned in the membrane-cell wall interface. Consequently, lipoproteins are involved in many surface associated functions, including cell wall synthesis, electron transport, uptake of nutrients, surface stress response, signal transduction, and they represent a reservoir of bacterial virulence factors. Inspection of 123 annotated Staphylococcus aureus genome sequences in the public domain revealed that this organism devotes about 2-3% of its coding capacity to lipoproteins, corresponding to about 70 lipoproteins per genome...
February 1, 2018: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29429078/transmembrane-signal-transduction-in-bacterial-chemosensing
#2
Michael D Manson
Like all living organisms, bacteria must communicate with the world around them. As they typically live as single cells, the communication with their environment must occur at the cell membrane, both in moving molecules in and out and in transmitting information about their surroundings to response elements within the cell. This volume is devoted primarily to methods used to study either the behavior of bacteria in response to their environment or methods used to study events that involve signaling pathways that are initiated by events at the cell membrane...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29427600/the-first-report-of-siglec-3-cd33-gene-in-a-teleost-rock-bream-oplegnathus-fasciatus-an-analysis-of-its-spatial-expression-during-stimulation-to-red-seabream-iridovirus-rsiv-and-two-bacterial-pathogens
#3
Joseph Jeswin, Min-Soo Joo, Ji-Min Jeong, Jin-Sol Bae, Kwang-Min Choi, Dong-Hee Cho, Son-Il Park, Chan-Il Park
Siglec-3/CD33 is a myeloid-specific inhibitory receptor that is expressed on cells of the immune system, where it is believed to play a regulatory role, modulating the inflammatory and immune responses. We characterized CD33 (RbCD33) in rock bream which is a transmembrane protein with two IG-like domains and a cytoplasmic tail. It has a deduced amino acid sequence of 390 residues and has tyrosine-based signaling motifs in the cytoplasmic tail. The RbCD33 mRNA was highly expressed in peripheral blood leukocytes and was also detected in the muscle, spleen, skin, head kidney, gills, trunk kidney, heart, stomach, brain, intestine and liver by quantitative real-time PCR...
February 7, 2018: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/29424663/a-large-scale-mutational-analysis-of-two-component-signaling-systems-of-lonsdalea-quercina-revealed-that-kdpd-kdpe-regulates-bacterial-virulence-against-host-poplar-trees
#4
Ruo-Lan Yang, Chao-Ying Deng, Jin-Wei Wei, Wei He, Ai-Ning Li, Wei Qian
Poplar, which is a dominant species in plant communities distributed in the northern hemisphere, is commonly used as a model plant in forestry studies. Poplar production can be inhibited by infections caused by bacteria, including Lonsdalea quercina subsp. populi, which is a Gram-negative bacterium responsible for bark canker disease. However, the molecular basis of the pathogenesis remains uncharacterized. In this study, we annotated the two-component signal transduction systems (TCSs) encoded by the L. quercina subsp...
February 9, 2018: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29378892/cpxr-dependent-thermoregulation-of-serratia-marcescens-prta-metalloprotease-expression-and-its-contribution-to-bacterial-biofilm-formation
#5
Roberto E Bruna, María Victoria Molino, Martina Lazzaro, Javier F Mariscotti, Eleonora García Véscovi
PrtA is the major secreted metalloprotease of Serratia marcescens. Previous reports implicate PrtA in the pathogenic capacity of this bacteria. PrtA is also clinically used as a potent analgesic and anti-inflammatory drug and its catalytic properties attract industrial interest. Comparatively, there is scarce knowledge about the mechanisms that physiologically govern PrtA expression in Serratia In this work, we demonstrate that PrtA production is de-repressed when the bacterial growth temperature decreases from 37°C to 30°C...
January 29, 2018: Journal of Bacteriology
https://www.readbyqxmd.com/read/29378340/regulator-degu-is-required-for-multicellular-behavior-in-lysinibacillus-sphaericus
#6
Yimin Hu, Quanxin Cai, Shen Tian, Yong Ge, Zhiming Yuan, Xiaomin Hu
DegS and DegU make up a two component system belonging to a class of signal transduction systems that play important roles in a broad range of bacterial responses to the environment. However, little study has been done to explore the physiological functions of DegS-DegU in mosquitocidal Lysinibacillus sphaericus. In this study, it was found that deletion of degU or degS-degU inhibited the swarming motility, biofilm formation, sporulation and binary toxin production through regulating the related genes, and phosphorylation was necessary for the functions of DegU...
January 25, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29374286/evidence-of-cross-regulation-in-two-closely-related-pyruvate-sensing-systems-in-uropathogenic-escherichia-coli
#7
Bradley D Steiner, Allison R Eberly, Melanie N Hurst, Ellisa W Zhang, Hamilton D Green, Stefan Behr, Kirsten Jung, Maria Hadjifrangiskou
Two-component systems (TCSs) dictate many bacterial responses to environmental change via the activation of a membrane-embedded sensor kinase, which has molecular specificity for a cognate response regulator protein. However, although the majority of TCSs operate through seemingly strict cognate protein-protein interactions, there have been several reports of TCSs that violate this classical model of signal transduction. Our group has recently demonstrated that some of these cross-interacting TCSs function in a manner that imparts a fitness advantage to bacterial pathogens...
January 27, 2018: Journal of Membrane Biology
https://www.readbyqxmd.com/read/29365093/ketamine-intervention-limits-pathogen-expansion-in-vitro
#8
German Torres, Christopher L Hoehmann, Joshua A Cuoco, Kyle Hitscherich, Charles Pavia, Michael Hadjiargyrou, Joerg R Leheste
Ketamine is one of several clinically important drugs whose therapeutic efficacy is due in part to their ability to act upon ion channels prevalent in nearly all biological systems. In studying eukaryotic and prokaryotic organisms in vitro, we show that ketamine short-circuits the growth and spatial expansion of three microorganisms, Stachybotrys chartarum, Staphylococcus epidermidis and Borrelia burgdorferi at doses efficient at reducing depression-like behaviors in mouse models of clinical depression. Although our findings do not reveal the mechanism(s) by which ketamine mediates its antifungal and antibacterial effects, we hypothesize that a function of L-glutamate signal transduction is associated with the ability of ketamine to limit pathogen expansion...
January 22, 2018: Pathogens and Disease
https://www.readbyqxmd.com/read/29343670/anti-sigma-factor-mediated-cell-surface-stress-responses-in-bacillus-subtilis
#9
Kei Asai
Proteins belonging to the sigma factor family in eubacteria initiate transcription by associating with RNA polymerase. A subfamily, the extracytoplasmic function (ECF) sigma factors, which form a widely distributed bacterial signal transduction system comprising a sigma factor and a cognate membrane-embedded anti-sigma factor, regulates genes in response to stressors that threaten cell envelope integrity including the cell wall and membrane. The Gram-positive soil bacterium Bacillus subtilis provides a valuable model for investigation of the ECF sigma factors...
January 17, 2018: Genes & Genetic Systems
https://www.readbyqxmd.com/read/29339429/the-biochemistry-of-sensing-enteric-pathogens-regulate-type-iii-secretion-in-response-to-environmental-and-host-cues
#10
REVIEW
Nicole J De Nisco, Giomar Rivera-Cancel, Kim Orth
Enteric pathogens employ sophisticated strategies to colonize and infect mammalian hosts. Gram-negative bacteria, such as Escherichia coli, Salmonella, and Campylobacter jejuni, are among the leading causes of gastrointestinal tract infections worldwide. The virulence strategies of many of these Gram-negative pathogens rely on type III secretion systems (T3SSs), which are macromolecular syringes that translocate bacterial effector proteins directly into the host cytosol. However, synthesis of T3SS proteins comes at a cost to the bacterium in terms of growth rate and fitness, both in the environment and within the host...
January 16, 2018: MBio
https://www.readbyqxmd.com/read/29317499/the-oligomerization-state-of-bacterial-enzyme-i-ei-determines-ei-s-allosteric-stimulation-or-competitive-inhibition-by-%C3%AE-ketoglutarate
#11
Trang Truc Nguyen, Rodolfo Ghirlando, Vincenzo Venditti
The bacterial phosphotransferase system (PTS) is a signal transduction pathway that couples phosphoryl transfer to active sugar transport across the cell membrane. The PTS is initiated by phosphorylation of enzyme I (EI) by phosphoenolpyruvate (PEP). The EI phosphorylation state determines the phosphorylation states of all other PTS components and is thought to play a central role in the regulation of several metabolic pathways and to control the biology of bacterial cells at multiple levels, for example, affecting virulence and biofilm formation...
January 9, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29311663/a-proline-deletion-in-ifnar1-impairs-ifn-signaling-and-underlies-increased-resistance-to-tuberculosis-in-humans
#12
Guoliang Zhang, Nicole A deWeerd, Sebastian A Stifter, Lei Liu, Boping Zhou, Wenfei Wang, Yiping Zhou, Binwu Ying, Xuejiao Hu, Antony Y Matthews, Magda Ellis, James A Triccas, Paul J Hertzog, Warwick J Britton, Xinchun Chen, Carl G Feng
Type I interferons (IFN), best known for their anti-viral functions, have been shown to impair host resistance to intracellular bacteria in mice. However, the precise role of type I IFN signaling in bacterial infection in humans is unclear. Here, we show that genetic variation in the human IFNAR1 gene is associated with decreased susceptibility to tuberculosis and an increased risk of viral hepatitis in Chinese populations. Receptor mutagenesis and cell signaling studies establish that the IFNAR1 mutation corresponding to a proline deletion in the hinge region of the membrane-proximal domain of IFNAR1 decreases the binding affinity of IFNAR1 to IFN-β, impeding type I IFN signaling...
January 8, 2018: Nature Communications
https://www.readbyqxmd.com/read/29304430/-force-from-lipids-gating-of-mechanosensitive-channels-modulated-by-pufas
#13
Pietro Ridone, Stephan L Grage, Amrutha Patkunarajah, Andrew R Battle, Anne S Ulrich, Boris Martinac
The level of fatty acid saturation in phospholipids is a crucial determinant of the biophysical properties of the lipid bilayer. Integral membrane proteins are sensitive to changes of their bilayer environment such that their activities and localization can be profoundly affected. When incorporated into phospholipids of mammalian cells, poly-unsaturated fatty acids (PUFAs) determine the mechanical properties of the bilayer thereby affecting several membrane-associated functions such as endo- and exo-cytosis and ion channel/membrane receptor signalling cascades...
December 28, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29295912/role-of-heat-shock-proteases-in-quorum-sensing-mediated-regulation-of-biofilm-formation-by-vibrio-species
#14
Kyung-Jo Lee, You-Chul Jung, Soon-Jung Park, Kyu-Ho Lee
Capsular polysaccharide (CPS) is essential for the dispersal of biofilms formed by the pathogenic bacterium Vibrio vulnificus CPS production is induced by the quorum-sensing (QS) master regulator SmcR when biofilms mature. However, V. vulnificus biofilms formed under heat shock conditions did not exhibit the dispersion stage. Transcripts of the CPS gene cluster were at basal levels in the heat-exposed cell owing to reduced cellular levels of SmcR. At least two proteases induced by heat shock, ClpPA and Lon, were responsible for determining the instability of SmcR...
January 2, 2018: MBio
https://www.readbyqxmd.com/read/29284206/a-two-component-signal-transduction-system-contributes-to-the-virulence-of-riemerella-anatipestifer
#15
Qing Wang, Mianmian Chen, Wei Zhang
Similar to other bacterial pathogens, current studies of the pathogenesis of Riemerella anatipestifer (RA) are focused mainly on in vitro culture conditions. To provide a further understanding of the pathogenesis of RA in vivo, bacterial RNA was extracted from overnight tryptic soy broth cultures (in vitro) and from the blood of infected ducks (in vivo) for comparative RNA-seq analysis. In total, 682 upregulated genes were identified in vivo. Among these upregulated genes, a signal transduction response regulator (ArsR) and a signal transduction histidine kinase (SthK) were predicted located on the same operon...
December 28, 2017: Journal of Veterinary Science
https://www.readbyqxmd.com/read/29281637/cell-envelope-stress-in-mycobacteria-is-regulated-by-the-novel-signal-transduction-atpase-inir-in-response-to-trehalose
#16
Maikel Boot, Vincent J C van Winden, Marion Sparrius, Robert van de Weerd, Alexander Speer, Roy Ummels, Tige Rustad, David R Sherman, Wilbert Bitter
The cell envelope of mycobacteria is a highly unique and complex structure that is functionally equivalent to that of Gram-negative bacteria to protect the bacterial cell. Defects in the integrity or assembly of this cell envelop must be sensed to allow the induction of stress response systems. The promoter that is specifically and most strongly induced upon exposure to ethambutol and isoniazid, first line drugs that affect cell envelope biogenesis, is the iniBAC promoter. In this study, we set out to identify the regulator of the iniBAC operon in Mycobacterium marinum using an unbiased transposon mutagenesis screen in a constitutively iniBAC-expressing mutant background...
December 27, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/29229699/the-nitrogen-regulatory-pii-protein-glnb-and-n-acetyl-glucosamine-6-phosphate-epimerase-nane-allosterically-activate-glucosamine-6-phosphate-deaminase-nagb-in-escherichia-coli
#17
Irina A Rodionova, Norman Goodacre, Mohan Babu, Andrew Emili, Peter Uetz, Milton H Saier
Amino sugars are good sources of both ammonia and fructose-6-phosphate, produced by glucosamine 6-phosphate deaminase, NagB. NagB is known to be allosterically regulated by N-acetyl-glucosamine 6-phosphate (GlcNAc-6P) and the phosphocarrier protein of the bacterial phosphotransferase system, HPr, in Escherichia coli We provide evidence that NanE, GlcNAc-6P epimerase, and the uridylylated PII protein also allosterically activate NagB by direct protein-protein interactions. NanE is essential for neuraminic acid (NANA) and N-acetylmannosamine (ManNAc) utilization, and PII is known to be a central metabolic nitrogen regulator...
December 11, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/29216299/recombinant-vaccinia-virus-coded-interferon-inhibitor-b18r-expression-refolding-and-a-use-in-a-mammalian-expression-system-with-a-rna-vector
#18
Yuriy G Kim, Aliya Zh Baltabekova, Erzhan E Zhiyenbay, Altynai S Aksambayeva, Zhadyra S Shagyrova, Rinat Khannanov, Erlan M Ramanculov, Alexandr V Shustov
B18R protein of Vaccinia virus binds to type I interferons and inhibits activation of interferon-mediated signal transduction. Cells which have unimpaired interferon signaling such as primary cell cultures or some industrially important cell lines are capable of development of an antiviral state. An establishment of the antiviral state limits replication of RNA-viruses and can suppress replication of RNA vectors. The interferon inhibitor B18R effectively prevents the establishment of the antiviral state. For this reason, B18R has become a ubiquitous component of protocols for epigenetic reprogramming which use transfections of RNA replicons or mRNA...
2017: PloS One
https://www.readbyqxmd.com/read/29214770/disruption-of-the-gut-ecosystem-by-antibiotics
#19
REVIEW
Mi Young Yoon, Sang Sun Yoon
The intestinal microbiota is a complex ecosystem consisting of various microorganisms that expands human genetic repertoire and therefore affects human health and disease. The metabolic processes and signal transduction pathways of the host and intestinal microorganisms are intimately linked, and abnormal progression of each process leads to changes in the intestinal environment. Alterations in microbial communities lead to changes in functional structures based on the metabolites produced in the gut, and these environmental changes result in various bacterial infections and chronic enteric inflammatory diseases...
January 2018: Yonsei Medical Journal
https://www.readbyqxmd.com/read/29208747/proposed-role-for-kaic-like-atpases-as-major-signal-transduction-hubs-in-archaea
#20
Kira S Makarova, Michael Y Galperin, Eugene V Koonin
All organisms must adapt to ever-changing environmental conditions and accordingly have evolved diverse signal transduction systems. In bacteria, the most abundant networks are built around the two-component signal transduction systems that include histidine kinases and receiver domains. In contrast, eukaryotic signal transduction is dominated by serine/threonine/tyrosine protein kinases. Both of these systems are also found in archaea, but they are not as common and diversified as their bacterial and eukaryotic counterparts, suggesting the possibility that archaea have evolved other, still uncharacterized signal transduction networks...
December 5, 2017: MBio
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