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Bacterial signal transduction

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https://www.readbyqxmd.com/read/28734616/do-shoot-the-messenger-pasta-kinases-as-virulence-determinants-and-antibiotic-targets
#1
REVIEW
Daniel A Pensinger, Adam J Schaenzer, John-Demian Sauer
All domains of life utilize protein phosphorylation as a mechanism of signal transduction. In bacteria, protein phosphorylation was classically thought to be mediated exclusively by histidine kinases as part of two-component signaling systems. However, it is now well appreciated that eukaryotic-like serine/threonine kinases (eSTKs) control essential processes in bacteria. A subset of eSTKs are single-pass transmembrane proteins that have extracellular penicillin-binding-protein and serine/threonine kinase-associated (PASTA) domains which bind muropeptides...
July 19, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28733487/the-stat4-mll1-epigenetic-axis-regulates-the-antimicrobial-functions-of-murine-macrophages
#2
William F Carson, Karen A Cavassani, Elyara M Soares, Soichiro Hirai, Nicolai A Kittan, Matthew A Schaller, Melissa M Scola, Amrita Joshi, Akihiro Matsukawa, David M Aronoff, Craig N Johnson, Yali Dou, Katherine A Gallagher, Steven L Kunkel
Macrophages are critical immune cells for the clearance of microbial pathogens and cellular debris from peripheral tissues. Macrophage inflammatory responses are governed by gene expression patterns, and these patterns are often subject to epigenetic control. Chromatin modifications, such as histone methylation, regulate gene accessibility in macrophages, and macrophage polarization is governed in part by the expression and function of chromatin-modifying enzymes. The histone methyltransferase mixed-lineage leukemia 1 (MLL1) preferentially modifies lysine residue 4 on the unstructured protein tail of histone H3...
July 21, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28727052/rapid-communication-subclinical-bovine-respiratory-disease-loci-and-pathogens-associated-with-lung-lesions-in-feedlot-cattle
#3
J N Kiser, T E Lawrence, M Neupane, C M Seabury, J F Taylor, J E Womack, H L Neibergs
Bovine respiratory disease (BRD) is an economically important disease of feedlot cattle that is caused by viral and bacterial pathogen members of the BRD complex. Many cases of subclinical BRD go untreated and are not detected until slaughter, when lung lesions are identified. The objectives of this study were to identify which BRD pathogens were associated with the presence of lung lesions at harvest and to identify genomic loci that were associated with susceptibility to lung lesions as defined by consolidation of the lung and/or the presence of fibrin tissue...
June 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28725299/role-of-streptococcus-mutans-two-component-systems-in-antimicrobial-peptide-resistance-in-the-oral-cavity
#4
REVIEW
Miki Kawada-Matsuo, Hitoshi Komatsuzawa
Approximately 100 trillion microorganisms exist in the oral cavity. For the commensal bacteria of the oral cavity, it is important to adapt to environmental stimuli, including human- or bacteria-derived antimicrobial agents. Recently, bacterial-specific signal transduction regulatory systems, called two-component systems (TCSs), which appear to be focused on sensing and adapting to the environment, were discovered. Streptococcus mutans is an oral commensal bacteria and is also known as a cariogenic bacteria...
August 2017: Japanese Dental Science Review
https://www.readbyqxmd.com/read/28687784/whole-transcriptome-sequencing-of-pseudomonas-syringae-pv-actinidiae-infected-kiwifruit-plants-reveals-species-specific-interaction-between-long-non-coding-rna-and-coding-genes
#5
Zupeng Wang, Yifei Liu, Li Li, Dawei Li, Qiong Zhang, Yangtao Guo, Shuaibin Wang, Caihong Zhong, Hongwen Huang
An outbreak of kiwifruit bacterial canker disease caused by Pseudomonas syringae pv. actinidiae (Psa) beginning in 2008 caused disaster to the kiwifruit industry. However the mechanisms of interaction between kiwifruit and Psa are unknown. Long noncoding RNAs (lncRNAs) are known to regulate many biological processes, but comprehensive repertoires of kiwifruit lncRNAs and their effects on the interaction between kiwifruit and Psa are unknown. Here, based on in-depth transcriptomic analysis of four kiwifruit materials at three stages of infection with Psa, we identified 14,845 transcripts from 12,280 loci as putative lncRNAs...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28687334/a-cysteine-protease-cathepsin-z-from-disk-abalone-haliotis-discus-discus-genomic-characterization-and-transcriptional-profiling-during-bacterial-infections
#6
G I Godahewa, N C N Perera, Sukkyoung Lee, Myoung-Jin Kim, Jehee Lee
Cathepsin Z (CTSZ) is lysosomal cysteine protease of the papain superfamily. It participates in the host immune defense via phagocytosis, signal transduction, cell-cell communication, proliferation, and migration of immune cells such as monocytes, macrophages, and dendritic cells. Hence, CTSZ is also acknowledged as an acute-phase protein in host immunity. In this study, we sought to identify the CTSZ homolog from disk abalone (AbCTSZ) and characterize it at the molecular, genomic, and transcriptional levels...
July 4, 2017: Gene
https://www.readbyqxmd.com/read/28674071/-major-tom-to-ground-control-how-lipoproteins-communicate-extra-cytoplasmic-stress-to-the-decision-center-of-the-cell
#7
Géraldine Laloux, Jean-François Collet
The envelope of bacteria is a complex multi-layered shield that ensures multiple essential functions, including protecting the cell from external assaults. Hence, bacterial cells have evolved intricate mechanisms, called envelope stress response systems (ESRS), to monitor all kinds of perturbations affecting the integrity of their envelope and mount an appropriate response to contain or repair the damage. In the model bacterium Escherichia coli, several ESRS are built around a two-component system, in which envelope stress triggers a phosphotransfer between a sensor protein in the inner membrane of the envelope and a response regulator in the cytoplasm...
July 3, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28658211/electron-cryo-microscopy-structure-of-the-mechanotransduction-channel-nompc
#8
Peng Jin, David Bulkley, Yanmeng Guo, Wei Zhang, Zhenhao Guo, Walter Huynh, Shenping Wu, Shan Meltzer, Tong Cheng, Lily Yeh Jan, Yuh-Nung Jan, Yifan Cheng
Mechanosensory transduction for senses such as proprioception, touch, balance, acceleration, hearing and pain relies on mechanotransduction channels, which convert mechanical stimuli into electrical signals in specialized sensory cells. How force gates mechanotransduction channels is a central question in the field, for which there are two major models. One is the membrane-tension model: force applied to the membrane generates a change in membrane tension that is sufficient to gate the channel, as in the bacterial MscL channel and certain eukaryotic potassium channels...
June 26, 2017: Nature
https://www.readbyqxmd.com/read/28642750/non-pylori-helicobacters-nhphs-induce-shifts-in-gastric-microbiota-in-helicobacter-pylori-infected-patients
#9
Xianhui Peng, Liya Zhou, Yanan Gong, Zhiqiang Song, Lihua He, Sanren Lin, Jianzhong Zhang
To explore the effects of gastric non-H. pylori Helicobacter species(NHPH) on the structure and potential function of gastric microbiota, we employed 16S rRNA gene sequencing on 164 gastric biopsy specimens from NHPH (H. suis, H. felis, H. salomonis) /H. pylori coinfection individuals, H. pylori monoinfection individuals and healthy controls. The results demonstrated that marked structural and functional variations between H. pylori mono- and coinfection samples (HPHS, HPHF, HPHM). The changes in bacterial structure induced by NHPH are mainly attributed to their ability of gastric acid secretion inhibition as well as bacterial chemotaxis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28642749/rna-seq-reveals-enhanced-sugar-metabolism-in-streptococcus-mutans-co-cultured-with-candida-albicans-within-mixed-species-biofilms
#10
Jinzhi He, Dongyeop Kim, Xuedong Zhou, Sang-Joon Ahn, Robert A Burne, Vincent P Richards, Hyun Koo
Early childhood caries (ECC), which can lead to rampant tooth-decay that is painful and costly to treat, is one of the most prevalent infectious diseases affecting children worldwide. Previous studies support that interactions between Streptococcus mutans and Candida albicans are associated with the pathogenesis of ECC. The presence of Candida enhances S. mutans growth, fitness and accumulation within biofilms in vitro, although the molecular basis for these behaviors is undefined. Using an established co-cultivation biofilm model and RNA-Seq, we investigated how C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28632994/role-of-the-small-gtpase-rap1-in-signal-transduction-cell-dynamics-and-bacterial-infection
#11
Hubert Hilbi, Arjan Kortholt
Rap1 belongs to the Ras family of small GTPases, which are involved in a multitude of cellular signal transduction pathways and have extensively been linked to cancer biogenesis and metastasis. The small GTPase is activated in response to various extracellular and intracellular cues. Rap1 has conserved functions in Dictyostelium discoideum amoeba and mammalian cells, which are important for cell polarity, substrate and cell-cell adhesion and other processes that involve the regulation of cytoskeletal dynamics...
June 20, 2017: Small GTPases
https://www.readbyqxmd.com/read/28630016/comparative-transcriptome-analysis-of-sinonovacula-constricta-in-gills-and-hepatopancreas-in-response-to-vibrio-parahaemolyticus-infection
#12
Xuelin Zhao, Xuemei Duan, Zhenhui Wang, Weiwei Zhang, Ye Li, Chunhua Jin, Jinbo Xiong, Chenghua Li
The razor clam Sinonovacula constricta is an important economic species in China. However, bacterial pathogenic diseases limits S. constricta farming industry for large-scale production. In this study, de novo transcriptome sequencing was performed on S. constricta gills and hepatopancreas under Vibrio parahaemolyticus challenge for 12 h and 48 h, respectively. Transcripts assembly constructed 18,330 sequences, each of which was 500 bp long and functionally annotated, and 1781 and 490 transcripts were differentially expressed in the gills and hepatopancreas, respectively...
August 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28629136/zinc-in-infection-and-inflammation
#13
REVIEW
Nour Zahi Gammoh, Lothar Rink
Micronutrient homeostasis is a key factor in maintaining a healthy immune system. Zinc is an essential micronutrient that is involved in the regulation of the innate and adaptive immune responses. The main cause of zinc deficiency is malnutrition. Zinc deficiency leads to cell-mediated immune dysfunctions among other manifestations. Consequently, such dysfunctions lead to a worse outcome in the response towards bacterial infection and sepsis. For instance, zinc is an essential component of the pathogen-eliminating signal transduction pathways leading to neutrophil extracellular traps (NET) formation, as well as inducing cell-mediated immunity over humoral immunity by regulating specific factors of differentiation...
June 17, 2017: Nutrients
https://www.readbyqxmd.com/read/28618121/specificity-traits-consistent-with-legume-rhizobia-coevolution-displayed-by-ensifer-meliloti-rhizosphere-colonization
#14
María Eugenia Salas, Mauricio Javier Lozano, José Luis López, Walter Omar Draghi, Javier Serrania, Gonzalo Arturo Torres Tejerizo, Francisco Javier Albicoro, Juliet Fernanda Nilsson, Mariano Pistorio, María Florencia Del Papa, Gustavo Parisi, Anke Becker, Antonio Lagares
Rhizobia are α- and ß-proteobacteria that associate with legumes in symbiosis to fix atmospheric nitrogen. The chemical communication between roots and rhizobia begins in the rhizosphere. Using signature-tagged-Tn5 mutagenesis (STM) we performed a genome-wide screening for Ensifer meliloti genes that participate in colonizing the rhizospheres of alfalfa and other legumes. The analysis of ca. 6,000 mutants indicated that genes relevant for rhizosphere colonization account for nearly 2% of the rhizobial genome and that most (ca...
June 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28604915/emergence-of-compositionally-tunable-nanoscale-dynamical-heterogeneity-in-model-binary-lipid-biomembranes
#15
Roobala C, Jaydeep K Basu
While the existence of nanoscale dynamical heterogeneity in biological membranes has been suggested to act as an active functional platform for enabling various cellular processes like signal transduction and viral or bacterial entry, it has been extremely difficult to detect the existence of such domains. Model lipid bilayer membranes have been widely used to detect such dynamical heterogeneity in order to avoid complications arising from the compositional heterogeneity of cellular membranes. However, even in model biological membranes the issue of nanoscale lipid dynamics has remained controversial and unresolved due to the difficulty of detecting the existence of such dynamical heterogeneity on the scale of 10-300 nm...
June 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/28593565/aggregatibacter-actinomycetemcomitans-regulates-the-expression-of-integrins-and-reduces-cell-adhesion-via-integrin-%C3%AE-5-in-human-gingival-epithelial-cells
#16
Shinsuke Kochi, Keisuke Yamashiro, Shoichi Hongo, Tadashi Yamamoto, Yuki Ugawa, Masayuki Shimoe, Mari Kawamura, Chiaki Hirata-Yoshihara, Hidetaka Ideguchi, Hiroshi Maeda, Shogo Takashiba
Gingival epithelial cells form a physiological barrier against bacterial invasion. Excessive bacterial invasion destroys the attachment between the tooth surface and the epithelium, resulting in periodontitis. Integrins play a significant role in cell attachment; therefore, we hypothesized that bacterial infection might decrease the expressions of these integrins in gingival epithelial cells, resulting in reduced cell adhesion. Immortalized human gingival epithelial cells were co-cultured with Aggregatibacter actinomycetemcomitans Y4 (Aa Y4), and the gene expression levels of IL-8, proliferating cell nuclear antigen (PCNA), and integrins (α2, α3, α5, β4, and β6) were measured using quantitative reverse transcription polymerase chain reaction...
June 7, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28575802/themes-and-variations-in-gene-regulation-by-extracytoplasmic-function-ecf-sigma-factors
#17
REVIEW
Elena Sineva, Maria Savkina, Sarah E Ades
The ECF sigma family was identified 23 years ago as a distinct group of σ(70)-like factors. ECF sigma factors have since emerged as a major form of bacterial signal transduction that can be grouped into over 50 phylogenetically distinct subfamilies. Advances in our understanding of these sigma factors and the signaling pathways governing their activity have elucidated conserved features as well as aspects that have evolved over time. All ECF sigma factors are predicted to share a common streamlined domain structure and mode of promoter interaction...
May 30, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/28549372/pgpr-strain-paenibacillus-polymyxa-sqr-21-potentially-benefits-watermelon-growth-by-re-shaping-root-protein-expression
#18
Yaoyao E, Jun Yuan, Fang Yang, Lei Wang, Jinghua Ma, Jing Li, Xiaowei Pu, Waseem Raza, Qiwei Huang, Qirong Shen
Paenibacillus polymyxa (SQR-21) is not only a plant growth-promoting rhizobacteria, but also an effective biocontrol agent against Fusarium wilt disease of watermelon. For the better understanding and clarifying the potential mechanisms of SQR-21 to improve watermelon growth and disease resistance, a split-root methodology in hydroponic and LC-MS technology with the label free method was used to analyze the key root proteins involved in watermelon metabolism and disease resistance after the inoculation of SQR-21...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28539556/susceptibility-genes-for-nontuberculous-mycobacterial-disease
#19
Ho Namkoong, Naoki Hasegawa, Tomoko Betsuyaku
  The number of patients with nontuberculous mycobacterial (NTM) disease is reportedly increasing both in Japan and worldwide. NTM diseases are classified into disseminated and pulmonary diseases based on their clinical characteristics. These two types of NTM diseases are thought to be controlled by different mechanisms. Disseminated NTM disease is caused by a defect in signal transduction of Th1 cellular immune responses, including the IFN-γ/IL-12 axis. The precise molecular mechanisms of disseminated NTM disease are understood in detail...
2017: Nihon Rinshō Men'eki Gakkai Kaishi, Japanese Journal of Clinical Immunology
https://www.readbyqxmd.com/read/28536675/an-overview-of-two-component-signal-transduction-systems-implicated-in-extra-intestinal-pathogenic-e-coli-infections
#20
REVIEW
Erin J Breland, Allison R Eberly, Maria Hadjifrangiskou
Extra-intestinal pathogenic E. coli (ExPEC) infections are common in mammals and birds. The predominant ExPEC types are avian pathogenic E. coli (APEC), neonatal meningitis causing E. coli/meningitis associated E. coli (NMEC/MAEC), and uropathogenic E. coli (UPEC). Many reviews have described current knowledge on ExPEC infection strategies and virulence factors, especially for UPEC. However, surprisingly little has been reported on the regulatory modules that have been identified as critical in ExPEC pathogenesis...
2017: Frontiers in Cellular and Infection Microbiology
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