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Type six secretion system

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https://www.readbyqxmd.com/read/29446800/biology-of-vibrio-cholera-editorial-overview
#1
EDITORIAL
Felipe Cava
In this monographic issue, we have the pleasure to present contributions from six of the leading laboratories at the forefront of Vibrio cholerae genetics, ecology and evolution, together with a brief tribute by Diego Romero to Doctor Jaime Ferrán y Clua, a pioneering Spanish bacteriologist who developed the first vaccine against this pathogen. V. cholerae is a free-living aquatic bacterium that interacts with and infects a variety of organisms. In humans it causes cholera, the deadly diarrhoea that was responsible for millions of deaths during seven pandemics since 1817, and still thousands every year...
September 2017: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/29425646/immunomodulatory-hemolytic-and-cytotoxic-activity-potentials-of-triterpenoid-saponins-from-eight-cephalaria-species
#2
Nazli Boke Sarikahya, Ayse Nalbantsoy, Hilal Top, Ramazan Suleyman Gokturk, Huseyin Sumbul, Suheyla Kirmizigul
BACKGROUND: Saponins isolated from a number of plants possess a broad spectrum of biological and pharmacological activities by using in vitro and in vivo bioassays. The recent investigations and findings in biological activity studies of saponins have mostly focused on immunomodulatory, hemolytic and cytotoxic properties. HYPOTHESIS/PURPOSE: Considering the great potential of saponins as bioactive agents, we investigated the cytotoxic, hemolytic and immunomodulatory activities of nineteen triterpenoid saponins from the aerial parts of eight Cephalaria species from Turkey...
January 1, 2018: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29420060/platelets-regulate-pulmonary-inflammation-and-tissue-destruction-in-tuberculosis
#3
Katharine A Fox, Daniela E Kirwan, Ashley M Whittington, Nitya Krishnan, Brian D Robertson, Robert H Gilman, José W López, Shivani Singh, Joanna C Porter, Jon S Friedland
RATIONALE: Platelets may interact with the immune system in tuberculosis (TB) to regulate human inflammatory responses that lead to morbidity and spread of infection. OBJECTIVES: To identify a functional role of platelets in the innate inflammatory and matrix degrading response in TB. METHODS: Markers of platelet activation were examined in plasma from 50 TB patients pre-treatment, and 50 controls. 25 patients were followed longitudinally...
February 8, 2018: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/29408937/comparison-of-secretory-signal-peptides-for-heterologous-protein-expression-in-microalgae-expanding-the-secretion-portfolio-for-chlamydomonas-reinhardtii
#4
João Vitor Dutra Molino, João Carlos Monteiro de Carvalho, Stephen Patrick Mayfield
Efficient protein secretion is a desirable trait for any recombinant protein expression system, together with simple, low-cost, and defined media, such as the typical media used for photosynthetic cultures of microalgae. However, low titers of secreted heterologous proteins are usually obtained, even with the most extensively studied microalga Chlamydomonas reinhardtii, preventing their industrial application. In this study, we aimed to expand and evaluate secretory signal peptides (SP) for heterologous protein secretion in C...
2018: PloS One
https://www.readbyqxmd.com/read/29398678/evaluation-of-two-commercial%C3%A2-enzyme-linked-immunosorbent-assay%C3%A2-kits-for-the-detection-of%C3%A2-human-circulating-metrnl
#5
Si-Li Zheng, Zhi-Yong Li, Zheng Zhang, Dong-Sheng Wang, Jian Xu, Chao-Yu Miao
Metrnl is a newly discovered secreted protein with neurotrophic activity and metabolic effect, while in earlier studies its circulating level in human was not explored. We evaluated two commercial enzyme-linked immunosorbent assay kits (DY7867-05, R&D Systems and SK00478-02, Aviscera Bioscience) for the detection of human circulating Metrnl. The DY7867-05 kit showed superiority over the SK00478-02 kit since it generated better curve fitting degree, smaller variation among tests, higher inter-assay reproducibility and better specificity, and could effectively detect human Metrnl in six types of blood samples...
February 2, 2018: Chemical & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29339460/dot-icm-translocated-proteins-important-for-biogenesis-of-the-coxiella-burnetii-containing-vacuole-identified-by-screening-of-an-effector-mutant-sub-library
#6
Emerson Crabill, Whitman B Schofield, Hayley J Newton, Andrew L Goodman, Craig R Roy
Coxiella burnetii is an intracellular pathogen that replicates in a lysosome-derived vacuole. A determinant necessary for C. burnetii virulence is the Dot/Icm type IVB secretion system (T4SS). The Dot/Icm system delivers more than 100 proteins, called type IV effectors (T4E), across the vacuolar membrane into the host cell cytosol. Several T4Es have been shown to be important for vacuolar biogenesis. Here, transposon insertion sequencing technology (INSeq) was used to identify C. burnetii Nine Mile phase II mutants in an arrayed library, which facilitated the identification and clonal isolation of mutants deficient in 70 different T4E proteins...
January 16, 2018: Infection and Immunity
https://www.readbyqxmd.com/read/29288127/structural-characterization-of-spoiiiab-sporulation-essential-protein-in-bacillus-subtilis
#7
N Zeytuni, K A Flanagan, L J Worrall, S C Massoni, A H Camp, N C J Strynadka
Endospore formation in the Gram-positive bacterium Bacillus subtilis initiates in response to nutrient depletion and involves a series of morphological changes that result in the creation of a dormant spore. Early in this developmental process, the cell undergoes an asymmetric cell division that produces the larger mother cell and smaller forespore, the latter destined to become the mature spore. The mother cell septal membrane then engulfs the forespore, at which time an essential channel, the so-called feeding-tube apparatus, is thought to cross both membranes to create a direct conduit between the cells...
December 26, 2017: Journal of Structural Biology
https://www.readbyqxmd.com/read/29260646/epidemiology-of-campylobacter-infections-among-children-in-egypt
#8
Rebecca Sainato, Atef ElGendy, Frédéric Poly, Janelle Kuroiwa, Patricia Guerry, Mark S Riddle, Chad K Porter
Campylobacter is a frequently isolated bacterial pathogen among children with diarrhea. Data are lacking on the distribution and spectrum of disease associated with Campylobacter species and Campylobacter jejuni capsular polysaccharide (CPS) types. This information is essential because current vaccine research seeks to target specific CPS types. An effective CPS-conjugate vaccine will need to cover CPS types that are both common and associated with severe disease. The US Naval Medical Research Unit-3 conducted several prospective cohort studies researching diarrheal disease in Egypt from 1995 to 2003...
December 18, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29222345/type-vi-secretion-system-sheath-inter-subunit-interactions-modulate-its-contraction
#9
Maximilian Brackmann, Jing Wang, Marek Basler
Secretion systems are essential for bacteria to survive and manipulate their environment. The bacterial type VI secretion system (T6SS) generates the force needed for protein translocation by the contraction of a long polymer called sheath. The sheath is a six-start helical assembly of interconnected VipA/VipB subunits. The mechanism of T6SS sheath contraction is unknown. Here, we show that elongating the N-terminal VipA linker or eliminating charge of a specific VipB residue abolishes sheath contraction and delivery of effectors into target cells...
December 8, 2017: EMBO Reports
https://www.readbyqxmd.com/read/29207798/does-vitamin-d-supplementation-improve-glycaemic-control-in-children-with-type-1-diabetes-mellitus-a-randomized-controlled-trial
#10
Shreya Sharma, Niranjan Biswal, Adhisivam Bethou, Medha Rajappa, Sadish Kumar, Vickneshwaran Vinayagam
Introduction: Vitamin D endocrine system is a potential immune system modulator and has been implicated in the pathogenesis of several autoimmune diseases including Type 1 Diabetes Mellitus (T1DM). Studies have demonstrated an inverse risk relationship between T1DM and Vitamin D levels and also, shown a reduced risk of the disease with its supplementation. Aim: To evaluate the role of Vitamin D as an adjuvant in improving glycaemic control and residual pancreatic beta-cell function...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29186295/systematic-analysis-and-prediction-of-type-iv-secreted-effector-proteins-by-machine-learning-approaches
#11
Jiawei Wang, Bingjiao Yang, Yi An, Tatiana Marquez-Lago, André Leier, Jonathan Wilksch, Qingyang Hong, Yang Zhang, Morihiro Hayashida, Tatsuya Akutsu, Geoffrey I Webb, Richard A Strugnell, Jiangning Song, Trevor Lithgow
In the course of infecting their hosts, pathogenic bacteria secrete numerous effectors, namely, bacterial proteins that pervert host cell biology. Many Gram-negative bacteria, including context-dependent human pathogens, use a type IV secretion system (T4SS) to translocate effectors directly into the cytosol of host cells. Various type IV secreted effectors (T4SEs) have been experimentally validated to play crucial roles in virulence by manipulating host cell gene expression and other processes. Consequently, the identification of novel effector proteins is an important step in increasing our understanding of host-pathogen interactions and bacterial pathogenesis...
November 27, 2017: Briefings in Bioinformatics
https://www.readbyqxmd.com/read/29164068/comparative-pan-genome-analysis-of-piscirickettsia-salmonis-reveals-genomic-divergences-within-genogroups
#12
Guillermo Nourdin-Galindo, Patricio Sánchez, Cristian F Molina, Daniela A Espinoza-Rojas, Cristian Oliver, Pamela Ruiz, Luis Vargas-Chacoff, Juan G Cárcamo, Jaime E Figueroa, Marcos Mancilla, Vinicius Maracaja-Coutinho, Alejandro J Yañez
Piscirickettsia salmonis is the etiological agent of salmonid rickettsial septicemia, a disease that seriously affects the salmonid industry. Despite efforts to genomically characterize P. salmonis, functional information on the life cycle, pathogenesis mechanisms, diagnosis, treatment, and control of this fish pathogen remain lacking. To address this knowledge gap, the present study conducted an in silico pan-genome analysis of 19 P. salmonis strains from distinct geographic locations and genogroups. Results revealed an expected open pan-genome of 3,463 genes and a core-genome of 1,732 genes...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29099329/the-influence-of-carbon-dioxide-pneumoperitoneum-on-systemic-inflammatory-response-syndrome-and-bacterial-translocation-in-patients-with-bacterial-peritonitis-caused-by-acute-appendicitis
#13
Huaidu Peng, Junshuo Zhang, Chudong Cai, Xi Fang, Junwei Wu
OBJECTIVE: To explore the influence of carbon dioxide pneumoperitoneum (CDP) on system inflammatory response syndrome (SIRS) and bacterial translocation (BT) in patients with bacterial peritonitis (BP) caused by acute appendicitis (AA). METHODS: Eighty-six consecutive subjects were randomly divided into the laparoscopy and laparotomy groups (n = 44 and n = 42, respectively). The levels of white blood cells (WBC), C-reactive protein (CRP), tumor necrosis factor α (TNF-α), and interleukin 6 (IL-6) of the 2 groups were tested preoperatively and at days 1, 2, and 4 after surgery...
November 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/29090192/identification-of-new-virulence-factors-and-vaccine-candidates-for-yersinia-pestis
#14
Jourdan A Andersson, Jian Sha, Tatiana E Erova, Eric C Fitts, Duraisamy Ponnusamy, Elena V Kozlova, Michelle L Kirtley, Ashok K Chopra
Earlier, we reported the identification of new virulence factors/mechanisms of Yersinia pestis using an in vivo signature-tagged mutagenesis (STM) screening approach. From this screen, the role of rbsA, which encodes an ATP-binding protein of ribose transport system, and vasK, an essential component of the type VI secretion system (T6SS), were evaluated in mouse models of plague and confirmed to be important during Y. pestis infection. However, many of the identified genes from the screen remained uncharacterized...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29084270/attaching-and-effacing-a-e-lesion-formation-by-enteropathogenic-e-coli-on-human-intestinal-mucosa-is-dependent-on-non-lee-effectors
#15
Massiel Cepeda-Molero, Cedric N Berger, Alistair D S Walsham, Samuel J Ellis, Simon Wemyss-Holden, Stephanie Schüller, Gad Frankel, Luis Ángel Fernández
Enteropathogenic E. coli (EPEC) is a human pathogen that causes acute and chronic pediatric diarrhea. The hallmark of EPEC infection is the formation of attaching and effacing (A/E) lesions in the intestinal epithelium. Formation of A/E lesions is mediated by genes located on the pathogenicity island locus of enterocyte effacement (LEE), which encode the adhesin intimin, a type III secretion system (T3SS) and six effectors, including the essential translocated intimin receptor (Tir). Seventeen additional effectors are encoded by genes located outside the LEE, in insertion elements and prophages...
October 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29051057/mannheimia-haemolytica-a2-secretes-different-proteases-into-the-culture-medium-and-in-outer-membrane-vesicles
#16
Gerardo Ramírez Rico, Moisés Martínez-Castillo, Cynthia González-Ruíz, Sarahí Luna-Castro, Mireya de la Garza
Respiratory diseases in ruminants have a significantly negative impact on the worldwide economy. The bacterium Mannheimia haemolytica is involved in pneumonic infections in bovine and ovine. In gram-negative bacteria, six secretion systems related to the colonization process and host tissue damage have been reported. In addition, in the last two decades, the production of outer membrane vesicles has been studied as a different bacterial strategy to release virulence factors, such as exotoxins, lipopolysaccharides, and proteases...
October 17, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29032494/the-effects-of-add-on-exenatide-to-insulin-on-glycemic-variability-and-hypoglycemia-in-patients-with-type-1-diabetes-mellitus
#17
L-L Jiang, S-Q Wang, B Ding, J Zhu, T Jing, L Ye, K-O Lee, J-D Wu, J-H Ma
OBJECTIVE: To investigate the effect of add-on exenatide to insulin on glycemic excursion and the counter-regulatory hormone in response to hypoglycemia in patients with type 1 diabetes mellitus (T1DM). METHODS: 30 patients with T1DM were recruited and randomly assigned to exenatide + insulin-treated group (group 1, n = 15) or insulin-only-treated group (group 2, n = 15) for 4 weeks. All patients had continuous glucose monitor system (CGMS) applied at before (week-0) and after (week-4) treatment to evaluate the glycemic variability...
October 14, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28981574/an-account-of-in-silico-identification-tools-of-secreted-effector-proteins-in-bacteria-and-future-challenges
#18
Cong Zeng, Lingyun Zou
Bacterial pathogens secrete numerous effector proteins via six secretion systems, type I to type VI secretion systems, to adapt to new environments or to promote virulence by bacterium-host interactions. Many computational approaches have been used in the identification of effector proteins before the subsequent experimental verification because they tolerate laborious biological procedures and are genome scale, automated and highly efficient. Prevalent examples include machine learning methods and statistical techniques...
July 19, 2017: Briefings in Bioinformatics
https://www.readbyqxmd.com/read/28955357/comparative-genomics-of-ralstonia-solanacearum-identifies-candidate-genes-associated-with-cool-virulence
#19
Ana M Bocsanczy, Jose C Huguet-Tapia, David J Norman
Strains of the Ralstonia solanacearum species complex in the phylotype IIB group are capable of causing Bacterial Wilt disease in potato and tomato at temperatures lower than 24°C. The capability of these strains to survive and to incite infection at temperatures colder than their normally tropical boundaries represents a threat to United States agriculture in temperate regions. In this work, we used a comparative genomics approach to identify orthologous genes linked to the lower temperature virulence phenotype...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28912123/type-vi-secretion-system-mix-effectors-carry-both-antibacterial-and-anti-eukaryotic-activities
#20
Ann Ray, Nika Schwartz, Marcela de Souza Santos, Junmei Zhang, Kim Orth, Dor Salomon
Most type VI secretion systems (T6SSs) described to date are protein delivery apparatuses that mediate bactericidal activities. Several T6SSs were also reported to mediate virulence activities, although only few anti-eukaryotic effectors have been described. Here, we identify three T6SSs in the marine bacterium Vibrio proteolyticus and show that T6SS1 mediates bactericidal activities under warm marine-like conditions. Using comparative proteomics, we find nine potential T6SS1 effectors, five of which belong to the polymorphic MIX-effector class...
November 2017: EMBO Reports
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