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Mycobacterium complex

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https://www.readbyqxmd.com/read/28223967/secretome-prediction-of-two-m-tuberculosis-clinical-isolates-reveals-their-high-antigenic-density-and-potential-drug-targets
#1
Fernanda Cornejo-Granados, Zyanya L Zatarain-Barrón, Vito A Cantu-Robles, Alfredo Mendoza-Vargas, Camilo Molina-Romero, Filiberto Sánchez, Luis Del Pozo-Yauner, Rogelio Hernández-Pando, Adrián Ochoa-Leyva
The Excreted/Secreted (ES) proteins play important roles during Mycobacterium tuberculosis invasion, virulence, and survival inside the host and they are a major source of immunogenic proteins. However, the molecular complexity of the bacillus cell wall has made difficult the experimental isolation of the total bacterial ES proteins. Here, we reported the genomes of two Beijing genotype M. tuberculosis clinical isolates obtained from patients from Vietnam (isolate 46) and South Africa (isolate 48). We developed a bioinformatics pipeline to predict their secretomes and observed that ~12% of the genome-encoded proteins are ES, being PE, PE-PGRS, and PPE the most abundant protein domains...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28222482/functional-reconstitution-of-the-mycobacterium-tuberculosis-long-chain-acyl-coa-carboxylase-from-multiple-acyl-coa-subunits
#2
Bernardo Bazet Lyonnet, Lautaro Diacovich, Gabriela Gago, Lucie Spina, Fabienne Bardou, Anne Lemassu, Annaïk Quémard, Hugo Gramajo
Mycobacterium tuberculosis produces a large number of structurally diverse lipids that have been implicated in the pathogenicity, persistence and antibiotic resistance of this organism. Most building blocks involved in the biosynthesis of all these lipids are generated by acyl-CoA carboxylases (ACCase) whose subunit composition and physiological roles have not yet been clearly established. A rather controversial data in the literature refers to the exact protein composition and substrate specificity of the enzyme complex that produces the long-chain α-carboxy-acyl-CoAs; one of the substrates involved in the last step of condensation mediated by the polyketide synthase Pks13 to synthesize mature mycolic acids...
February 21, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28222189/molecular-epidemiology-of-mycobacterium-tuberculosis-complex-in-brussels-2010-2013
#3
Christelle Vluggen, Karine Soetaert, Guido Groenen, Maryse Wanlin, Martine Spitaels, Wouter Arrazola de Oñate, Maryse Fauville-Dufaux, Claude Saegerman, Vanessa Mathys
The tuberculosis (TB) incidence rate in Brussels-Capital Region is 3-fold higher than in Belgium as a whole. Eight years after the realization of initial prospective population-based molecular epidemiology investigations in this Region, a similar study over the period 2010-2013 was conducted. TB strains isolated from 945 patients were submitted to genotyping by standardized 24-locus-MIRU-VNTR typing and spoligotyping. The phylogenetic analysis showed that the LAM (16.7%) and Haarlem (15.7%) branches are the two most prevalent TB lineages circulating in Brussels...
2017: PloS One
https://www.readbyqxmd.com/read/28221129/new-mycobacterium-tuberculosis-complex-sublineage-brazzaville-congo
#4
Sven Malm, Laure S Ghoma Linguissi, Emmanuel M Tekwu, Jeannhey C Vouvoungui, Thomas A Kohl, Patrick Beckert, Anissa Sidibe, Sabine Rüsch-Gerdes, Igor K Madzou-Laboum, Sylvie Kwedi, Véronique Penlap Beng, Matthias Frank, Francine Ntoumi, Stefan Niemann
Tuberculosis is a leading cause of illness and death in Congo. No data are available about the population structure and transmission dynamics of the Mycobacterium tuberculosis complex strains prevalent in this central Africa country. On the basis of single-nucleotide polymorphisms detected by whole-genome sequencing, we phylogenetically characterized 74 MTBC isolates from Brazzaville, the capital of Congo. The diversity of the study population was high; most strains belonged to the Euro-American lineage, which split into Latin American Mediterranean, Uganda I, Uganda II, Haarlem, X type, and a new dominant sublineage named Congo type (n = 26)...
March 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28221106/pulmonary-nontuberculous-mycobacteria-associated-deaths-ontario-canada-2001-2013
#5
Theodore K Marras, Michael A Campitelli, Hong Lu, Hannah Chung, Sarah K Brode, Alex Marchand-Austin, Kevin L Winthrop, Andrea S Gershon, Jeffrey C Kwong, Frances B Jamieson
Survival implications of nontuberculous mycobacterial pulmonary disease (NTM-PD) and NTM pulmonary isolation without disease (NTM-PI) are unclear. To study deaths associated with NTM-PD and NTM-PI and differences in survival between them, we conducted a population-based cohort study of persons with microbiologically defined NTM-PD or NTM-PI diagnosed during 2001-2013 in Ontario, Canada. We used propensity score matching and Cox proportional hazards models to compare survival. Among 9,681 NTM-PD patients and 10,936 NTM-PI patients, 87% and 91%, respectively, were successfully matched with unexposed controls...
March 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28219954/mycolactone-reveals-substrate-driven-complexity-of-sec61-dependent-transmembrane-protein-biogenesis
#6
Michael McKenna, Rachel E Simmonds, Stephen High
Mycolactone is the exotoxin virulence factor produced by Mycobacterium ulcerans, the pathogen responsible for Buruli ulcer. The skin lesions and immunosuppression characteristic of this disease result from the action of mycolactone, which targets the Sec61 complex and inhibits the co-translational translocation of secretory proteins into the endoplasmic reticulum. In this study, we investigate the effect of mycolactone on the Sec61-dependent biogenesis of different classes of transmembrane protein (TMP). Our data suggest that the effect of mycolactone on TMP biogenesis depends on how the nascent chain initially engages the Sec61 complex...
February 20, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28219077/radiopathological-features-and-identification-of-mycobacterial-infections-in-granulomatous-nodules-resected-from-the-lung
#7
Yumi Sakakibara, Yoshimi Suzuki, Toshihide Fujie, Takumi Akashi, Tadatsune Iida, Yasunari Miyazaki, Yoshinobu Eishi, Naohiko Inase
BACKGROUND: Pulmonary granulomas are sometimes resected because they resemble lung cancer and false-positive findings come through from positron emission tomography (PET) using 18fluorine-fluorodeoxyglucose (18F-FDG). Mycobacterial infection is a common cause of granulomas. OBJECTIVE: The purpose of this study was to evaluate the radiopathological features and the methods for identifying mycobacterial infections in granulomatous nodules resected from the lung. METHODS: Thirty-five solitary lesions resected because of suspected lung cancer were enrolled, including 22 nonfungal granulomatous lesions and 13 benign lesions as controls...
February 21, 2017: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/28210462/accuracy-of-a-new-rapid-antigen-detection-test-for-pulmonary-tuberculosis
#8
Rasoul Aliannejad, Ahmadreza Bahrmand, Hamidreza Abtahi, Mahnaz Seifi, Enayat Safavi, Farid Abdolrahimi, Shahriyar Shahriaran
BACKGROUND AND OBJECTIVES: Tuberculosis (TB) is a major problem in the world. Treatment and control of TB needs detection of the Mycobacterium tuberculosis (MT) in the proper samples. While smear doesn't have enough sensitivity, culture and PCR are expensive, time consuming and unavailable in many centers. Recent development of a rapid TB antigen detection test (PrTBK) at Pasteur Institute of Iran could give a simple way for diagnosis of TB in about two hours. In this test the antigen-antibody complex will change color when gold conjugated mouse anti-rabbit antibody detects specific MT cell wall antigen in suspected samples...
August 2016: Iranian Journal of Microbiology
https://www.readbyqxmd.com/read/28205597/the-influence-of-accd5-on-accd6-carboxyltransferase-essentiality-in-pathogenic-and-non-pathogenic-mycobacterium
#9
Jakub Pawelczyk, Albertus Viljoen, Laurent Kremer, Jaroslaw Dziadek
Malonyl-coenzyme A (CoA) is a crucial extender unit for the synthesis of mycolic and other fatty acids in mycobacteria, generated in a reaction catalyzed by acetyl-CoA carboxylase. We previously reported on the essentiality of accD6Mtb encoding the functional acetyl-CoA carboxylase subunit in Mycobacterium tuberculosis. Strikingly, the homologous gene in the fast-growing, non-pathogenic Mycobacterium smegmatis - (accD6Msm) appeared to be dispensable, and its deletion did not influence the cell lipid content...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205097/identifying-and-characterising-ppe7-rv0354c-high-activity-binding-peptides-and-their-role-in-inhibiting-cell-invasion
#10
Diana P Díaz, Marisol Ocampo, Yahson Varela, Hernando Curtidor, Manuel A Patarroyo, Manuel E Patarroyo
This study was aimed at characterising the PPE7 protein from the PE/PPE protein family. The presence and transcription of the rv0354c gene in the Mycobacterium tuberculosis complex was determined and the subcellular localisation of the PPE7 protein on mycobacterial membrane was confirmed by immunoelectron microscope. Two peptides were identified as having high binding activity (HABPs) and were tested in vitro regarding the invasion of Mycobacterium tuberculosis H37Rv. HABP 39224 inhibited invasion in A549 epithelial cells and U937 macrophages by more than 50%, whilst HABP 39225 inhibited invasion by 40% in U937 cells...
February 15, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28202799/clonal-complexity-in-mycobacterium-tuberculosis-can-hamper-diagnostic-procedures
#11
Laura Pérez-Lago, Marta Herranz, Yurena Navarro, María Jesús Ruiz Serrano, Pilar Miralles, Emilio Bouza, Darío García-de-Viedma
Clonal complexity is increasingly accepted in Mycobacterium tuberculosis infection, including mixed infections by ≥2 strains, which usually occur in settings with a high burden of tuberculosis and/or a high risk of overexposure to infected patients. Mixed infections can hamper diagnostic procedures: obtaining an accurate antibiogram is difficult when the susceptibility patterns of the strains differ. Here, we show how mixed infections can also prove challenging for other diagnostic procedures, even outside settings where mixed infections are traditionally expected...
February 15, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28201993/structure-and-variation-of-crispr-and-crispr-flanking-regions-in-deleted-direct-repeat-region-mycobacterium-tuberculosis-complex-strains
#12
Paul Jeffrey Freidlin, Israel Nissan, Anna Luria, Drora Goldblatt, Lana Schaffer, Hasia Kaidar-Shwartz, Daniel Chemtob, Zeev Dveyrin, Steven Robert Head, Efrat Rorman
BACKGROUND: CRISPR and CRISPR-flanking genomic regions are important for molecular epidemiology of Mycobacterium tuberculosis complex (MTBC) strains, and potentially for adaptive immunity to phage and plasmid DNA, and endogenous roles in the bacterium. Genotyping in the Israel National Mycobacterium Reference Center Tel-Aviv of over 1500 MTBC strains from 2008-2013 showed three strains with validated negative 43-spacer spoligotypes, that is, with putatively deleted direct repeat regions (deleted-DR/CRISPR regions)...
February 15, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28194371/non-tuberculous-mycobacteria-in-south-african-wildlife-neglected-pathogens-and-potential-impediments-for-bovine-tuberculosis-diagnosis
#13
Nomakorinte Gcebe, Tiny M Hlokwe
Non-tuberculous mycobacteria (NTM) are not only emerging and opportunistic pathogens of both humans and animals, but from a veterinary point of view some species induce cross-reactive immune responses that hamper the diagnosis of bovine tuberculosis (bTB) in both livestock and wildlife. Little information is available about NTM species circulating in wildlife species of South Africa. In this study, we determined the diversity of NTM isolated from wildlife species from South Africa as well as Botswana. Thirty known NTM species and subspecies, as well as unidentified NTM, and NTM closely related to Mycobacterium goodii/Mycobacterium smegmatis were identified from 102 isolates cultured between the years 1998 and 2010, using a combination of molecular assays viz PCR and sequencing of different Mycobacterial house-keeping genes as well as single nucleotide polymorphism (SNP) analysis...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28192916/combating-enhanced-intracellular-survival-eis-mediated-kanamycin-resistance-of-mycobacterium-tuberculosis-by-novel-pyrrolo-1-5-a-pyrazine-based-eis-inhibitors
#14
Atefeh Garzan, Melisa J Willby, Huy X Ngo, Chathurada S Gajadeera, Keith D Green, Selina Y L Holbrook, Caixia Hou, James E Posey, Oleg V Tsodikov, Sylvie Garneau-Tsodikova
Tuberculosis (TB) remains one of the leading causes of mortality worldwide. Hence, the identification of highly effective antitubercular drugs with novel modes of action is crucial. In this paper, we report the discovery and development of pyrrolo[1,5-a]pyrazine-based analogues as highly potent inhibitors of the Mycobacterium tuberculosis (Mtb) acetyltransferase enhanced intracellular survival (Eis), whose up-regulation causes clinically observed resistance to the aminoglycoside (AG) antibiotic kanamycin A (KAN)...
February 17, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28192214/immune-recognition-surface-construction-of-mycobacterium-tuberculosis-epitope-specific-antibody-responses-in-tuberculosis-patients-identified-by-peptide-microarrays
#15
REVIEW
Davide Valentini, Martin Rao, Giovanni Ferrara, Marc Perkins, Ernest Dodoo, Alimuddin Zumla, Markus Maeurer
BACKGROUND: Understanding of humoral immune responses in tuberculosis (TB) is gaining interest, since B-cells and antibodies may be important in diagnosis as well as protective immune responses. High-content peptide microarrays (HCPM) are highly precise and reliable for gauging specific antibody responses to pathogens, as well as autoantigens. METHODS: An HCPM comprising epitopes spanning 154 proteins of Mycobacterium tuberculosis was used to gauge specific IgG antibody responses in sera of TB patients from Africa and South America...
February 10, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28190461/detection-of-mycobacterium-chelonae-mycobacterium-abscessus-group-and-mycobacterium-fortuitum-complex-by-a-multiplex-real-time-pcr-directly-from-clinical-samples-using-the-bd-max-system
#16
Talita T Rocchetti, Suzane Silbert, Alicia Gostnell, Carly Kubasek, Antonio C Campos Pignatari, Raymond Widen
A new multiplex PCR test was designed to detect Mycobacterium chelonae, Mycobacterium abscessus group, and Mycobacterium fortuitum complex on the BD MAX System. A total of 197 clinical samples previously submitted for mycobacterial culture were tested using the new protocol. Samples were first treated with proteinase K, and then each sample was inoculated into the BD MAX Sample Buffer Tube. Extraction and multiplex PCR were performed by the BD MAX System, using the BD MAX ExK TNA-3 extraction kit and BD TNA Master Mix, along with specific in-house designed primers and probes for each target...
March 2017: Journal of Molecular Diagnostics: JMD
https://www.readbyqxmd.com/read/28188830/in-vitro-activity-of-clarithromycin-in-combination-with-other-antimicrobial-agents-against-mycobacterium-abscessus-and-mycobacterium-massiliense
#17
Zhijian Zhang, Jie Lu, Min Liu, Yufeng Wang, Yanlin Zhao, Yu Pang
Macrolides, especially clarithromycin (CLA), remain the cornerstone of therapy for Mycobacterium abscessus complex infections. The purpose of this study was to gather results from in vitro drug susceptibility testing of M. abscessus and Mycobacterium massiliense for the combination of CLA with various other agents, including linezolid (LZD), moxifloxacin (MOX), amikacin (AMK) and tigecycline (TGC). A total of 40 M. abscessus complex isolates were studied, comprising 20 M. abscessus and 20 M. massiliense strains...
February 7, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28182700/pilot-double-blind-randomized-placebo-controlled-clinical-trial-of-the-supplement-food-nyaditum-resae%C3%A2-in-adults-with-or-without-latent-tb-infection-safety-and-immunogenicity
#18
Eva Montané, Ana Maria Barriocanal, Ana Lucía Arellano, Angelica Valderrama, Yolanda Sanz, Nuria Perez-Alvarez, Paula Cardona, Cristina Vilaplana, Pere-Joan Cardona
BACKGROUND: Nyaditum resae® (NR) is a galenic preparation of heat-killed Mycobacterium manresensis, a new species of the fortuitum complex, that is found in drinkable water, and that has demonstrated to protect against the development of active TB in a murine experimental model that develop human-like lesions. METHODS: Double-blind, randomized, placebo-controlled Clinical Trial (51 volunteers included). Two different doses of NR and a placebo were tested, the randomization was stratified by Latent Tuberculosis Infection (LTBI)-positive (n = 21) and LTBI-negative subjects (n = 30)...
2017: PloS One
https://www.readbyqxmd.com/read/28178715/infectious-causes-of-right-middle-lobe-syndrome
#19
Aatif Rashid, Sowmya Nanjappa, John N Greene
Right middle lobe (RML) syndrome is defined as recurrent or chronic obstruction or infection of the middle lobe of the right lung. Nonobstructive causes of middle lobe syndrome include inflammatory processes and defects in the bronchial anatomy and collateral ventilation. We report on 2 case patients with RML syndrome, one due to infection with Mycobacterium avium complex followed by M asiaticum infection and the other due to allergic bronchopulmonary aspergillosis. A history of atopy, asthma, or chronic obstructive pulmonary disease has been reported in up to one-half of those with RML...
January 2017: Cancer Control: Journal of the Moffitt Cancer Center
https://www.readbyqxmd.com/read/28177043/performance-of-a-molecular-assay-to-detect-mycobacterium-tuberculosis-complex-dna-in-clinical-specimens-multicenter-study-in-brazil
#20
Mirela Verza, Karen Barros Schmid, Regina Bones Barcellos, Natali Linck, Graziele Lima Bello, Daniel Scapin, Rosa Dea Sperhacke, Márcia Susana Nunes Silva, Claudia Wollheim, Martha Gabriela Celle Rivero, Afrânio Lineu Kritski, Leonides Rezende, Martha Maria Oliveira, Elis Regina Dalla Costa, Maria Lucia Rosa Rossetti
BACKGROUND: In high tuberculosis (TB) burden countries, there are few data on the performance of new molecular commercialised assays developed locally. OBJECTIVE: To evaluate the performance of a new molecular commercialised assay for TB diagnosis (Detect-TB) in three laboratories. METHODS: A total of 302 sputum samples from an equal number of patients with presumptive diagnosis of pulmonary tuberculosis (PTB) were submitted for routine smear microscopy, culture, and Detect-TB assay at three different sites in Brazil (the cities of Caxias do Sul, São Paulo and Canoas)...
February 2017: Memórias do Instituto Oswaldo Cruz
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