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BMC Microbiology

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https://www.readbyqxmd.com/read/27919228/antimicrobial-activity-and-safety-evaluation-of-peptides-isolated-from-the-hemoglobin-of-chickens
#1
Fengjiao Hu, Qiaoxing Wu, Shuang Song, Ruiping She, Yue Zhao, Yifei Yang, Meikun Zhang, Fang Du, Majid Hussain Soomro, Ruihan Shi
BACKGROUND: Hemoglobin is a rich source of biological peptides. As a byproduct and even wastewater of poultry-slaughtering facilities, chicken blood is one of the most abundant source of hemoglobin. RESULTS: In this study, the chicken hemoglobin antimicrobial peptides (CHAP) were isolated and the antimicrobial and bactericidal activities were tested by the agarose diffusion assay, minimum inhibitory concentration (MIC) analysis, minimal bactericidal concentration (MBC) analysis, and time-dependent inhibitory and bactericidal assays...
December 5, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27914477/in-vitro-rescue-of-genital-strains-of-chlamydia-trachomatis-from-interferon-%C3%AE-and-tryptophan-depletion-with-indole-positive-but-not-indole-negative-prevotella-spp
#2
Noa Ziklo, Wilhelmina M Huston, Kuong Taing, Mohammad Katouli, Peter Timms
BACKGROUND: The natural course of sexually transmitted infections caused by Chlamydia trachomatis varies between individuals. In addition to parasite and host effects, the vaginal microbiota might play a key role in the outcome of C. trachomatis infections. Interferon-gamma (IFN-γ), known for its anti-chlamydial properties, activates the expression of indoleamine 2,3-dioxygenase (IDO1) in epithelial cells, an enzyme that catabolizes the amino acid L- tryptophan into N-formylkynurenine, depleting the host cell's pool of tryptophan...
December 3, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27894276/small-proteins-in-cyanobacteria-provide-a-paradigm-for-the-functional-analysis-of-the-bacterial-micro-proteome
#3
Desiree Baumgartner, Matthias Kopf, Stephan Klähn, Claudia Steglich, Wolfgang R Hess
BACKGROUND: Despite their versatile functions in multimeric protein complexes, in the modification of enzymatic activities, intercellular communication or regulatory processes, proteins shorter than 80 amino acids (μ-proteins) are a systematically underestimated class of gene products in bacteria. Photosynthetic cyanobacteria provide a paradigm for small protein functions due to extensive work on the photosynthetic apparatus that led to the functional characterization of 19 small proteins of less than 50 amino acids...
November 28, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27894256/burkholderia-pseudomallei-derived-mir-3473-enhances-nf-%C3%AE%C2%BAb-via-targeting-traf3-and-is-associated-with-different-inflammatory-responses-compared-to-burkholderia-thailandensis-in-murine-macrophages
#4
Yao Fang, Hai Chen, Yi Hu, Qian Li, Zhiqiang Hu, Tengfei Ma, Xuhu Mao
BACKGROUND: Burkholderia pseudomallei (Bp) is the causative agent of melioidosis, a kind of tropical disease. Burkholderia thailandensis (Bt), with a high sequence similarity to Bp, is thought to be an avirulent organism. Since there are numerous similarities between Bp and Bt, their differences in pathogenesis of host response and related mechanism are still undermined. In recent years, microRNAs have been researched in many diseases, but seldom involved in bacterial infection, bacteria-host interaction or explaining the differences between virulent and avirulent species...
November 28, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27894251/comprehensive-analysis-of-the-fecal-microbiota-of-healthy-japanese-adults-reveals-a-new-bacterial-lineage-associated-with-a-phenotype-characterized-by-a-high-frequency-of-bowel-movements-and-a-lean-body-type
#5
Kaihei Oki, Mutsumi Toyama, Taihei Banno, Osamu Chonan, Yoshimi Benno, Koichi Watanabe
BACKGROUND: In Japan, a variety of traditional dietary habits and daily routines have developed in many regions. The effects of these behaviors, and the regional differences in the composition of the gut microbiota, are yet to be sufficiently studied. To characterize the Japanese gut microbiota and identify the factors shaping its composition, we conducted 16S metagenomics analysis of fecal samples collected from healthy Japanese adults residing in various regions of Japan. Each participant also completed a 94-question lifestyle questionnaire...
November 28, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27887582/yptb3816-of-yersinia-pseudotuberculosis-strain-ip32953-is-a-virulence-related-metallo-oligopeptidase
#6
Ali Atas, Alan M Seddon, Donna C Ford, Ian A Cooper, Brendan W Wren, Petra C F Oyston, Andrey V Karlyshev
BACKGROUND: Although bacterial peptidases are known to be produced by various microorganisms, including pathogenic bacteria, their role in bacterial physiology is not fully understood. In particular, oligopeptidases are thought to be mainly involved in degradation of short peptides e.g. leader peptides released during classical protein secretion pathways. The aim of this study was to investigate effects of inactivation of an oligopeptidase encoding gene opdA gene of Yersinia pseudotuberculosis on bacterial properties in vivo and in vitro, and to test dependence of the enzymatic activity of the respective purified enzyme on the presence of different divalent cations...
November 25, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27887575/the-gut-microbiota-in-young-and-middle-aged-rats-showed-different-responses-to-chicken-protein-in-their-diet
#7
Yingying Zhu, He Li, Xinglian Xu, Chunbao Li, Guanghong Zhou
BACKGROUND: Meat protein in the diet has been shown to be beneficial for the growth of Lactobacillus in the caecum of growing rats; however, it is unknown whether gut microbiota in middle-aged animals have the same responses to meat protein diets. This study compared the composition of the gut microbiota between young and middle-aged rats after being fed 17.7% chicken protein diet for 14 days. METHODS: Feces were collected on day 0 and day 14 from young rats (4 weeks old) and middle-aged rats (64 weeks old) fed with 17...
November 25, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27884113/disrupting-ros-protection-mechanism-allows-hydrogen-peroxide-to-accumulate-and-oxidize-sb-iii-to-sb-v-in-pseudomonas-stutzeri-ts44
#8
Dan Wang, Fengqiu Zhu, Qian Wang, Christopher Rensing, Peng Yu, Jing Gong, Gejiao Wang
BACKGROUND: Microbial antimonite [Sb(III)] oxidation converts toxic Sb(III) into less toxic antimonate [Sb(V)] and plays an important role in the biogeochemical Sb cycle. Currently, little is known about the mechanisms underlying bacterial Sb(III) resistance and oxidation. RESULTS: In this study, Tn5 transposon mutagenesis was conducted in the Sb(III)-oxidizing strain Pseudomonas stutzeri TS44 to isolate the genes responsible for Sb(III) resistance and oxidation...
November 25, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27884109/cloning-functional-expression-and-characterization-of-a-bifunctional-3-hydroxybutanal-dehydrogenase-reductase-involved-in-acetone-metabolism-by-desulfococcus-biacutus
#9
Jasmin Frey, Hendrik Rusche, Bernhard Schink, David Schleheck
BACKGROUND: The strictly anaerobic, sulfate-reducing bacterium Desulfococcus biacutus can utilize acetone as sole carbon and energy source for growth. Whereas in aerobic and nitrate-reducing bacteria acetone is activated by carboxylation with CO2 to acetoacetate, D. biacutus involves CO as a cosubstrate for acetone activation through a different, so far unknown pathway. Proteomic studies indicated that, among others, a predicted medium-chain dehydrogenase/reductase (MDR) superfamily, zinc-dependent alcohol dehydrogenase (locus tag DebiaDRAFT_04514) is specifically and highly produced during growth with acetone...
November 25, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27871246/functional-characterization-of-thiolase-encoding-genes-from-xanthophyllomyces-dendrorhous-and-their-effects-on-carotenoid-synthesis
#10
Nicole Werner, Melissa Gómez, Marcelo Baeza, Víctor Cifuentes, Jennifer Alcaíno
BACKGROUND: The basidiomycetous yeast Xanthophyllomyces dendrorhous has been described as a potential biofactory for terpenoid-derived compounds due to its ability to synthesize astaxanthin. Functional knowledge of the genes involved in terpenoid synthesis would create opportunities to enhance carotenoid production. A thiolase enzyme catalyzes the first step in terpenoid synthesis. RESULTS: Two potential thiolase-encoding genes were found in the yeast genome; bioinformatically, one was identified as an acetyl-CoA C-acetyltransferase (ERG10), and the other was identified as a 3-ketoacyl Co-A thiolase (POT1)...
November 21, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27871232/lipooligosaccharide-locus-classes-and-putative-virulence-genes-among-chicken-and-human-campylobacter-jejuni-isolates
#11
Patrik Ellström, Ingrid Hansson, Anna Nilsson, Hilpi Rautelin, Eva Olsson Engvall
BACKGROUND: Campylobacter cause morbidity and considerable economic loss due to hospitalization and post infectious sequelae such as reactive arthritis, Guillain Barré- and Miller Fischer syndromes. Such sequelae have been linked to C. jejuni harboring sialic acid structures in their lipooligosaccharide (LOS) layer of the cell wall. Poultry is an important source of human Campylobacter infections but little is known about the prevalence of sialylated C. jejuni isolates and the extent of transmission of such isolates to humans...
November 21, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27863465/bacillus-species-bt42-isolated-from-coffea-arabica-l-rhizosphere-antagonizes-colletotrichum-gloeosporioides-and-fusarium-oxysporum-and-also-exhibits-multiple-plant-growth-promoting-activity
#12
Tekalign Kejela, Vasudev R Thakkar, Parth Thakor
BACKGROUND: Colletotrichum and Fusarium species are among pathogenic fungi widely affecting Coffea arabica L., resulting in major yield loss. In the present study, we aimed to isolate bacteria from root rhizosphere of the same plant that is capable of antagonizing Colletotrichum gloeosporioides and Fusarium oxysporum as well as promotes plant growth. RESULTS: A total of 42 Bacillus species were isolated, one of the isolates named BT42 showed maximum radial mycelial growth inhibition against Colletotrichum gloeosporioides (78%) and Fusarium oxysporum (86%)...
November 18, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27852238/illumina-sequencing-based-community-analysis-of-bacteria-associated-with-different-bryophytes-collected-from-tibet-china
#13
Jing Yan Tang, Jing Ma, Xue Dong Li, Yan Hong Li
BACKGROUND: Previous studies on the bacteria associated with the bryophytes showed that there were abundant bacteria inhabited in/on these hosts. However, the type of bacteria and whether these discriminate between different bryophytes based on a particular factor remains largely unknown. RESULTS: This study was designed to analyze the biodiversity and community of the bacteria associated with ten liverworts and ten mosses using Illumina-sequencing techniques based on bacterial 16S rRNA gene...
November 16, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27852235/enrichment-dynamics-of-listeria-monocytogenes-and-the-associated-microbiome-from-naturally-contaminated-ice-cream-linked-to-a-listeriosis-outbreak
#14
Andrea Ottesen, Padmini Ramachandran, Elizabeth Reed, James R White, Nur Hasan, Poorani Subramanian, Gina Ryan, Karen Jarvis, Christopher Grim, Ninalynn Daquiqan, Darcy Hanes, Marc Allard, Rita Colwell, Eric Brown, Yi Chen
BACKGROUND: Microbiota that co-enrich during efforts to recover pathogens from foodborne outbreaks interfere with efficient detection and recovery. Here, dynamics of co-enriching microbiota during recovery of Listeria monocytogenes from naturally contaminated ice cream samples linked to an outbreak are described for three different initial enrichment formulations used by the Food and Drug Administration (FDA), the International Organization of Standardization (ISO), and the United States Department of Agriculture (USDA)...
November 16, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27842515/evaluation-of-pacbio-sequencing-for-full-length-bacterial-16s-rrna-gene-classification
#15
Josef Wagner, Paul Coupland, Hilary P Browne, Trevor D Lawley, Suzanna C Francis, Julian Parkhill
BACKGROUND: Currently, bacterial 16S rRNA gene analyses are based on sequencing of individual variable regions of the 16S rRNA gene (Kozich, et al Appl Environ Microbiol 79:5112-5120, 2013).This short read approach can introduce biases. Thus, full-length bacterial 16S rRNA gene sequencing is needed to reduced biases. A new alternative for full-length bacterial 16S rRNA gene sequencing is offered by PacBio single molecule, real-time (SMRT) technology. The aim of our study was to validate PacBio P6 sequencing chemistry using three approaches: 1) sequencing the full-length bacterial 16S rRNA gene from a single bacterial species Staphylococcus aureus to analyze error modes and to optimize the bioinformatics pipeline; 2) sequencing the full-length bacterial 16S rRNA gene from a pool of 50 different bacterial colonies from human stool samples to compare with full-length bacterial 16S rRNA capillary sequence; and 3) sequencing the full-length bacterial 16S rRNA genes from 11 vaginal microbiome samples and compare with in silico selected bacterial 16S rRNA V1V2 gene region and with bacterial 16S rRNA V1V2 gene regions sequenced using the Illumina MiSeq...
November 14, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27832756/lactobacillus-acidophilus-alleviates-the-inflammatory-response-to-enterotoxigenic-escherichia-coli-k88-via-inhibition-of-the-nf-%C3%AE%C2%BAb-and-p38-mitogen-activated-protein-kinase-signaling-pathways-in-piglets
#16
Haihua Li, Lei Zhang, Longbin Chen, Qi Zhu, Wenjie Wang, Jiayun Qiao
BACKGROUND: A newly isolated L. acidophilus strain has been reported to have potential anti-inflammatory activities against lipopolysaccharide (LPS) challenge in piglet, while the details of the related inflammatory responses are limited. Here we aimed to analysis the ability of L. acidophilus to regulate inflammatory responses and to elucidate the mechanisms involved in its anti-inflammatory activity. RESULTS: The ETEC (enterotoxigenic Escherichia coli) K88-induced up-regulations of IL-1β, IL-8 and TNF-α were obviously inhibited by L...
November 10, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27829373/pyruvate-oxidase-of-streptococcus-pneumoniae-contributes-to-pneumolysin-release
#17
Joseph C Bryant, Ridge C Dabbs, Katie L Oswalt, Lindsey R Brown, Jason W Rosch, Keun S Seo, Janet R Donaldson, Larry S McDaniel, Justin A Thornton
BACKGROUND: Streptococcus pneumoniae is one of the leading causes of community acquired pneumonia and acute otitis media. Certain aspects of S. pneumoniae's virulence are dependent upon expression and release of the protein toxin pneumolysin (PLY) and upon the activity of the peroxide-producing enzyme, pyruvate oxidase (SpxB). We investigated the possible synergy of these two proteins and identified that release of PLY is enhanced by expression of SpxB prior to stationary phase growth...
November 9, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27829372/identification-of-mycobacterium-avium-subsp-hominissuis-secreted-proteins-using-an-in-vitro-system-mimicking-the-phagosomal-environment
#18
Jessica J Chinison, Lia Danelishvili, Rashmi Gupta, Sasha J Rose, Lmar M Babrak, Luiz E Bermudez
BACKGROUND: Mycobacterium avium subsp. hominissuis is a common intracellular pathogen that infects patients with HIV/AIDS and cause lung infection in patients with underlying lung pathology. M.avium preferably infects macrophages and uses diverse mechanisms to alter phagosome maturation. Once in the macrophage, the pathogen can alter the host cellular defenses by secreting proteins into the cytosol of host cells, but despite considerable research, only a few secreted effector proteins have been identified...
November 9, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27829359/selection-of-streptomyces-against-soil-borne-fungal-pathogens-by-a-standardized-dual-culture-assay-and-evaluation-of-their-effects-on-seed-germination-and-plant-growth
#19
Andrea Kunova, Maria Bonaldi, Marco Saracchi, Cristina Pizzatti, Xiaoyulong Chen, Paolo Cortesi
BACKGROUND: In the search for new natural resources for crop protection, streptomycetes are gaining interest in agriculture as plant growth promoting bacteria and/or biological control agents. Because of their peculiar life cycle, in which the production of secondary metabolites is synchronized with the development of aerial hyphae and sporulation, the commonly used methods to screen for bacterial antagonists need to be adapted. RESULTS: The dual culture assay was standardized in terms of inoculation timing of Streptomyces antagonist and pathogen, and growth rate of different fungal pathogens...
November 9, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27825310/prevalence-characteristics-and-correlates-of-enteric-pathogenic-protozoa-in-drinking-water-sources-in-molyko-and-bomaka-cameroon-a-cross-sectional-study
#20
Fuh Anold Nsoh, Buh Amos Wung, Julius Atashili, Pokam Thumamo Benjamin, Eba Marvlyn, Keumami Katte Ivo, Assob Jules Clément Nguedia
BACKGROUND: Access to potable water remains a major challenge particularly in resource-limited settings. Although the potential contaminants of water are varied, enteric pathogenic protozoa are known to cause waterborne diseases greatly. This study aimed at investigating the prevalence, characteristics and correlates of enteric pathogenic protozoa in drinking water sources in Buea, Cameroon. METHODS: A cross-sectional study was conducted using 155 water samples collected from various drinking sources (boreholes, springs, taps and wells)...
November 8, 2016: BMC Microbiology
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