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https://www.readbyqxmd.com/read/29318719/crystal-structures-of-mglb-2-tp0684-a-topologically-variant-d-glucose-binding-protein-from-treponema-pallidum-reveal-a-ligand-induced-conformational-change
#1
Chad A Brautigam, Ranjit K Deka, Wei Z Liu, Michael V Norgard
Previously, we determined the crystal structure of apo-TpMglB-2, a D-glucose-binding component of a putative ABC transporter from the syphilis spirochete Treponema pallidum. The protein had an unusual topology for this class of proteins, raising the question of whether the D-glucose-binding mode would be different in TpMglB-2. Here, we present the crystal structures of a variant of TpMglB-2 with and without D-glucose bound. The structures demonstrate that, despite its aberrant topology, the protein undergoes conformational changes and binds D-glucose similarly to other Mgl-type proteins, likely facilitating D-glucose uptake in T...
January 10, 2018: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/29311239/induction-of-il-10-by-borrelia-burgdorferi-is-regulated-by-the-action-of-cd14-dependent-p38-mapk-and-camp-mediated-chromatin-remodeling
#2
Bikash Sahay, Kathleen Bashant, Nicole J Nelson, Rebeca L Patsey, Shiva Kumar Gadila, Rebecca Boohaker, Ashutosh Verma, Klemen Strle, Timothy J Sellati
Host genotype influences the severity of murine Lyme borreliosis, caused by the spirochetal bacterium Borrelia burgdorferi C57BL/6 (B6) mice develop mild, whereas C3H/HeN (C3H) mice develop severe Lyme arthritis. Differential expression of interleukin 10 (IL-10) has long been associated with mouse strain differences in Lyme pathogenesis; however, the underlying mechanism(s) of this genotype-specific IL-10 regulation remained elusive. Herein we reveal a cAMP-mediated mechanism of IL-10 regulation in B6 macrophages that is substantially diminished in C3H macrophages...
January 8, 2018: Infection and Immunity
https://www.readbyqxmd.com/read/29288009/borrelia-persica-infection-in-rock-hyraxes
#3
Gabriela Kleinerman, Roni King, Yaarit Nachum-Biala, Gad Baneth
Tick-borne relapsing fever (TBRF) is an acute infectious disease caused by arthropod-borne spirochetes of the genus Borrelia and characterized by recurrent episodes of fever. Borrelia persica, the causative agent of this disease in Israel, is transmitted by the argasid tick Ornithodoros tholozani. There is little information about the maintenance and possible vertebrate reservoirs of B. persica in nature, but the tick O. tholozani is known to feed on animals that enter its habitat in caves, rock crevices and shady environments...
December 9, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/29276701/characterization-of-ixodes-ricinus-fibrinogen-related-proteins-ixoderins-discloses-their-function-in-the-tick-innate-immunity
#4
Helena Honig Mondekova, Radek Sima, Veronika Urbanova, Vojtech Kovar, Ryan O M Rego, Libor Grubhoffer, Petr Kopacek, Ondrej Hajdusek
Ticks are important vectors of serious human and animal disease-causing organisms, but their innate immunity can fight invading pathogens and may have the ability to reduce or block transmission to mammalian hosts. Lectins, sugar-binding proteins, can distinguish between self and non-self-oligosaccharide motifs on pathogen surfaces. Although tick hemolymph possesses strong lectin activity, and several lectins have already been isolated and characterized, little is known about the implementation of these molecules in tick immunity...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29259089/peptide-uptake-is-essential-for-borrelia-burgdorferi-viability-and-involves-structural-and-regulatory-complexity-of-its-oligopeptide-transporter
#5
Ashley M Groshong, Abhishek Dey, Irina Bezsonova, Melissa J Caimano, Justin D Radolf
Borrelia burgdorferi is an extreme amino acid (AA) auxotroph whose genome encodes few free AA transporters and an elaborate oligopeptide transport system (B. burgdorferi Opp [BbOpp]). BbOpp consists of five oligopeptide-binding proteins (OBPs), two heterodimeric permeases, and a heterodimeric nucleotide-binding domain (NBD). Homology modeling based on the crystal structure of liganded BbOppA4 revealed that each OBP likely binds a distinct range of peptides. Transcriptional analyses demonstrated that the OBPs are differentially and independently regulated whereas the permeases and NBDs are constitutively expressed...
December 19, 2017: MBio
https://www.readbyqxmd.com/read/29258802/a-molecular-algorithm-to-detect-and-differentiate-human-pathogens-infecting-ixodes-scapularis-and-ixodes-pacificus-acari-ixodidae
#6
Christine B Graham, Sarah E Maes, Andrias Hojgaard, Amy C Fleshman, Sarah W Sheldon, Rebecca J Eisen
The incidence and geographic range of tick-borne illness associated with Ixodes scapularis and Ixodes pacificus have dramatically increased in recent decades. Anaplasmosis, babesiosis, and Borrelia spirochete infections, including Lyme borreliosis, account for tens of thousands of reported cases of tick-borne disease every year. Assays that reliably detect pathogens in ticks allow investigators and public health agencies to estimate the geographic distribution of human pathogens, assess geographic variation in their prevalence, and evaluate the effectiveness of prevention strategies...
December 10, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/29258801/diversity-of-borrelia-spirochetes-and-other-zoonotic-agents-in-ticks-from-kyiv-ukraine
#7
Artem Rogovskyy, Maliha Batool, David C Gillis, Patricia J Holman, Igor V Nebogatkin, Yuliya V Rogovska, Maksym S Rogovskyy
Lyme borreliosis (LB) is caused by tick-borne spirochetes of the Borrelia burgdorferi sensu lato complex. LB is the most prevalent vector-borne illness in Ukraine, but current data on the prevalence of LB pathogens in their tick vector, Ixodes ricinus, are lacking. I. ricinus ticks may also carry Borrelia miyamotoi, an emerging relapsing fever group spirochete that has been implicated in human illness. Despite its zoonotic potential, the prevalence of B. miyamotoi in ticks has not been examined in Ukraine. Similarly, data on the prevalence of other important tick-borne pathogens, Anaplasma phagocytophilum, Babesia spp...
December 15, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/29243132/hiv-associated-opsoclonus-myoclonus-ataxia-syndrome-early-infection-immune-reconstitution-syndrome-or-secondary-to-other-diseases-case-report-and-literature-review
#8
Bruno F Guedes, Márcio A A Vieira Filho, Clarice Listik, Rafael B Carra, Cristiane B Pereira, Emanuelle R da Silva, Hélio R Gomes, José E Vidal
Opsoclonus-myoclonus-ataxia (OMA) syndrome is a debilitating autoimmune neurological disorder. Post-infectious opsoclonus-myoclonus-ataxia syndrome has been described with varying bacterial, spirochetal, and viral infections including several patients with HIV. However, specific immunopathological mechanisms that may lead to opsoclonus-myoclonus in HIV-positive patients are unknown.We report a case of HIV-associated opsoclonus-myoclonus and early HIV infection. A review of published literature shows opsoclonus-myoclonus can occur during early infection, in immune reconstitution syndrome or in association with other infections, especially tuberculosis...
December 14, 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/29242055/late-disseminated-lyme-disease-associated-pathology-and-spirochete-persistence-post-treatment-in-rhesus-macaques
#9
Nicholas A Crossland, Xavier Alvarez, Monica E Embers
Non-human primates currently serve as the best experimental model for Lyme disease due to their close genetic homology with humans and demonstration of all three phases of disease following infection with Borreliella (Borrelia) burgdorferi (Bb). We investigated the pathology associated with late disseminated Lyme disease (12 to 13 months following tick inoculation) in doxycycline-treated (28 days; 5mg/kg, oral, 2x/day) and untreated rhesus macaques (Rm). Minimal to moderate lymphoplasmacytic inflammation, with a predilection for perivascular spaces and collagenous tissues, was observed in multiple tissues including the cerebral leptomeninges, brainstem, peripheral nerves from both fore and hind limbs, stifle synovium and perisynovial adipose tissue, urinary bladder, skeletal muscle, myocardium, and visceral pericardium...
December 11, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/29240045/pier-diego-siccardi-1880-1917-and-the-clinica-del-lavoro-in-the-trench-warfare
#10
Michele Augusto Riva, Michela Caramella, Massimo Turato, Giancarlo Cesana
BACKGROUND: The year 2017 marks the centenary of the death of the Italian scientist Pier Diego Siccardi (1880-1917), one of Luigi Devoto's assistants at the "Clinica del Lavoro" in Milan. OBJECTIVES: To commemorate Siccardi and to describe the activities of the physicians of the "Clinica del Lavoro" during World War I. METHODS: A comprehensive analysis was conducted on scientific papers written by Pier Diego Siccardi and by other physicians belonging to the Clinica del Lavoro, in the period 1915-1918...
December 14, 2017: La Medicina del Lavoro
https://www.readbyqxmd.com/read/29232415/serological-detection-of-tick-borne-relapsing-fever-in-texan-domestic-dogs
#11
Maria D Esteve-Gasent, Chloe B Snell, Shakirat A Adetunji, Julie Piccione
Tick-Borne Relapsing Fever (TBRF) is caused by spirochetes in the genus Borrelia. Very limited information exists on the incidence of this disease in humans and domestic dogs in the United States. The main objective of this study is to evaluate exposure of dogs to Borrelia turicatae, a causative agent of TBRF, in Texas. To this end, 878 canine serum samples were submitted to Texas A&M Veterinary Medical Diagnostic Laboratory from October 2011 to September 2012 for suspected tick-borne illnesses. The recombinant Borrelial antigen glycerophosphodiester phosphodiesterase (GlpQ) was expressed, purified, and used as a diagnostic antigen in both ELISA assays and Immunoblot analysis...
2017: PloS One
https://www.readbyqxmd.com/read/29224873/a-clinical-and-histopathological-comparison-of-the-effectiveness-of-salicylic-acid-to-a-compound-of-inorganic-acids-for-the-treatment-of-digital-dermatitis-in-cattle
#12
N Capion, E K Larsson, O L Nielsen
Bovine digital dermatitis (DD) is a painful infectious disease, causing lameness, reduced animal welfare, and production losses in dairy herds. The main factors contributing to DD are an infection with Treponema spp. and poor hygiene. Topical treatment has primarily consisted of antibiotics; however, the demand for effective nonantibiotic alternatives is increasing. The objective was to evaluate the performance of 3 nonantibiotic topical treatments (salicylic acid and a compound of inorganic acids in a 20% solution and in a dry form) on DD in a commercial dairy herd...
December 7, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29221753/pura-the-gene-encoding-pur-alpha-member-of-an-ancient-nucleic-acid-binding-protein-family-with-mammalian-neurological-functions
#13
REVIEW
Dianne C Daniel, Edward M Johnson
The PURA gene encodes Pur-alpha, a 322 amino acid protein with repeated nucleic acid binding domains that are highly conserved from bacteria through humans. PUR genes with a single copy of this domain have been detected so far in spirochetes and bacteroides. Lower eukaryotes possess one copy of the PUR gene, whereas chordates possess 1-4 PUR family members. Human PUR genes encode Pur-alpha (Pura), Pur-beta (Purb) and two forms of Pur-gamma (Purg). Pur-alpha is a protein that binds specific DNA and RNA sequence elements...
December 5, 2017: Gene
https://www.readbyqxmd.com/read/29211798/lipl21-lipoprotein-binding-to-peptidoglycan-enables-leptospira-interrogans-to-escape-nod1-and-nod2-recognition
#14
Gwenn Ratet, Ignacio Santecchia, Martine Fanton d'Andon, Frédérique Vernel-Pauillac, Richard Wheeler, Pascal Lenormand, Frédéric Fischer, Pierre Lechat, David A Haake, Mathieu Picardeau, Ivo G Boneca, Catherine Werts
Leptospirosis is a widespread zoonosis, potentially severe in humans, caused by spirochetal bacteria, Leptospira interrogans (L. interrogans). Host defense mechanisms involved in leptospirosis are poorly understood. Recognition of lipopolysaccharide (LPS) and lipoproteins by Toll-Like Receptors (TLR)4 and TLR2 is crucial for clearance of leptospires in mice, yet the role of Nucleotide Oligomerization Domain (NOD)-like receptors (NOD)1 and NOD2, recognizing peptidoglycan (PG) fragments has not previously been examined...
December 6, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29204849/human-intestinal-spirochetosis-mimicking-ulcerative-colitis
#15
Shin Nishii, Masaaki Higashiyama, Sho Ogata, Shunsuke Komoto, Suguru Ito, Akinori Mizoguchi, Hisato Terada, Hirotaka Furuhashi, Takeshi Takajo, Kazuhiko Shirakabe, Chikako Watanabe, Kengo Tomita, Shigeaki Nagao, Soichiro Miura, Ryota Hokari
Human intestinal spirochetosis (HIS) is a colorectal infection caused by the Brachyspira species of intestinal spirochetes, whose pathogenicity in humans remains unclear owing to the lack of or mild symptoms. We monitored the 5-year clinical course of a woman diagnosed with HIS in whom ulcerative colitis (UC) had been suspected. Following a positive fecal occult blood test, she underwent a colonoscopic examination at a local clinic where she was diagnosed with "right-sided" UC concomitant with incidentally detected HIS, and was referred to our hospital...
December 4, 2017: Clinical Journal of Gastroenterology
https://www.readbyqxmd.com/read/29196824/spirochetal-lipoproteins-in-pathogenesis-and-immunity
#16
David A Haake, Wolfram R Zückert
Lipoproteins are lipid-modified proteins that dominate the spirochetal proteome. While found in all bacteria, spirochetal lipoproteins have unique features and play critical roles in spirochete biology. For this reason, considerable effort has been devoted to determining how the lipoproteome is generated. Essential features of the structural elements of lipoproteins are now understood with greater clarity, enabling greater confidence in identification of lipoproteins from genomic sequences. The journey from the ribosome to the outer membrane, and in some cases, to the cellular surface has been defined, including secretion, lipidation, sorting, and export across the outer membrane...
December 2, 2017: Current Topics in Microbiology and Immunology
https://www.readbyqxmd.com/read/29195857/evaluating-acarological-risk-for-exposure-to-ixodes-scapularis-and-ixodes-scapularis-borne-pathogens-in-recreational-and-residential-settings-in-washington-county-minnesota
#17
Micah B Hahn, Jenna K H Bjork, David F Neitzel, Frances M Dorr, Tessa Whitemarsh, Karen A Boegler, Christine B Graham, Tammi L Johnson, Sarah E Maes, Rebecca J Eisen
The distribution of I. scapularis, the tick vector of the bacteria that cause Lyme disease, has been expanding over the last two decades in the north-central United States in parallel with increasing incidence of human cases of Lyme disease in that region. However, assessments of residential risk for exposure to ticks are lacking from this region. Here, we measured the density of host-seeking I. scapularis nymphs in two suburban and two rural public recreational sites located in Washington County, Minnesota as well as in nearby residential properties...
November 22, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/29187397/the-spirochete-brachyspira-pilosicoli-enteric-pathogen-of-animals-and-humans
#18
REVIEW
David J Hampson
Brachyspira pilosicoli is a slow-growing anaerobic spirochete that colonizes the large intestine. Colonization occurs commonly in pigs and adult chickens, causing colitis/typhlitis, diarrhea, poor growth rates, and reduced production. Colonization of humans also is common in some populations (individuals living in village and peri-urban settings in developing countries, recent immigrants from developing countries, homosexual males, and HIV-positive patients), but the spirochete rarely is investigated as a potential human enteric pathogen...
January 2018: Clinical Microbiology Reviews
https://www.readbyqxmd.com/read/29184822/gingivitis-and-plaque-prevention-using-three-commercially-available-dentifrices-a-comparative-clinical-and-microbiological-randomized-control-parallel-study
#19
Ramprasad Reddy, Rajababu Palaparthy, Satyanarayana Durvasula, Pradeep Koppolu, Essam Elkhatat, Khaled Ali Rajab Assiri, A Al Sulaiman Abdulrahman Saad
Aim: The aim of the study was to compare the clinical and microbiological efficacy of Group I-delmopinol dentifrice, Group II-chlorhexidine, and Group III-triclosan-containing regularly used control dentifrice on plaque formation and gingivitis. Materials and Methods: A total of 45 healthy volunteer students fulfilling the inclusion criteria are recruited for this randomized control parallel study. All the individuals were randomly assigned into 3 groups depending on the dentifrice prescribed...
July 2017: International Journal of Pharmaceutical Investigation
https://www.readbyqxmd.com/read/29174448/conspecific-hyperparasitism-an-alternative-route-for-borrelia-hermsii-transmission-by-the-tick-ornithodoros-hermsi
#20
Brandi N Williamson, Tom G Schwan
Ixodid and argasid ticks may hyperparasitize other individuals of their own species to acquire a blood meal, however most accounts are based on single observations and the behavior has rarely been studied. While maintaining laboratory colonies of Ornithodoros species, we noticed that unfed ticks occasionally fed on other ticks that were feeding on mice, and unfed ticks parasitized engorged ticks when confined together in tubes. Therefore, we investigated hyperparasitism by Ornithodoros hermsi and the ability of these ticks to acquire and transmit the relapsing fever spirochete Borrelia hermsii when feeding on other ticks...
November 21, 2017: Ticks and Tick-borne Diseases
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