journal
https://read.qxmd.com/read/38525892/spatial-arrangement-and-density-variations-in-the-cell-envelope-of-deinococcus-radiodurans
#1
JOURNAL ARTICLE
Domenica Farci, Dario Piano
The cell envelope of the poly-extremophile bacterium Deinococcus radiodurans is renowned for its highly organized structure and unique functional characteristics. In this bacterium, a precise regularity characterizes not just the S-layer, but it also extends to the underlying cell envelope layers, resulting in a dense and tightly arranged configuration. This regularity is attributed to a minimum of three protein complexes located at the outer membrane level. Together, they constitute a recurring structural unit that extends across the cell envelope, effectively tiling the entirety of the cell body...
March 25, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38507780/co-inoculation-with-novel-nodule-inhabiting-bacteria-reduces-the-benefits-of-legume-rhizobium-symbiosis
#2
JOURNAL ARTICLE
James C Kosmopoulos, Rebecca Doyle, Katy D Heath
The ecologically and economically vital symbiosis between nitrogen-fixing rhizobia and leguminous plants is often thought of as a bi-partite interaction, yet studies increasingly show the prevalence of non-rhizobial endophytes (NREs) that occupy nodules alongside rhizobia. Yet, what impact these NREs have on plant or rhizobium fitness remains unclear. Here, we investigated four NRE strains found to naturally co-occupy nodules of the legume Medicago truncatula alongside Sinorhizobium meliloti in native soils...
March 20, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38452350/investigating-the-spatiotemporal-dynamics-of-apple-tree-phyllosphere-bacterial-and-fungal-communities-across-cultivars-in-orchards
#3
JOURNAL ARTICLE
Sophie Boutin, Ema Lussier, Isabelle Laforest-Lapointe
The phyllosphere, a reservoir of diverse microbial life associated with plant health, harbors microbial communities that are subject to various complex ecological processes acting at multiple scales. In this study, we investigated the determinants of the spatiotemporal variation in bacterial and fungal communities within the apple tree phyllosphere, employing 16S and ITS amplicon sequencing. Our research assessed the impact of key factors - plant compartment, site, time, and cultivar - on the composition and diversity of leaf and flower microbial communities...
March 7, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38447122/biological-and-genomic-characteristics-of-three-novel-bacteriophages-and-a-phage-plasmid-of-klebsiella-pneumoniae
#4
JOURNAL ARTICLE
Aylin Uskudar Guclu, Sezin Unlu, Hanife Salih Doğan, Suleyman Yalcin, Ahmet Basustaoglu
Bacteriophages have emerged as promising candidates for the treatment of difficult-to-treat bacterial infections. The aim of this study is to isolate and characterize phages infecting carbapenem-resistant (CR) and extended-spectrum beta-lactamase (ESBL) producer K.pneumoniae isolates. Water samples were taken for the isolation of bacteriophages. One-step growth curve, the optimal multiplicity of infection (MOI), thermal and pH stabilities, transmission electron microscopy (TEM) of phages were determined, and whole-genome sequencing (WGS) was conducted...
March 6, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38427979/plant-seedlings-of-peas-tomatoes-and-cucumbers-exude-compounds-that-are-needed-for-growth-and-chemoattraction-of-rhizobium-leguminosarum-bv-viciae-3841-and-azospirillum-brasilense-sp7
#5
JOURNAL ARTICLE
Fatema Akter Nisha, Janice Tagoe, Amanda Pease, Shelley M Horne, Angel Ugrinov, Barney Geddes, Birgit Pruess
This study characterizes seedling exudates of peas, tomatoes and cucumbers at the level of chemical composition and functionality. A plant experiment confirmed that Rhizobium leguminosarum bv. viciae 3841 enhanced growth of pea shoots, while Azospirillum brasilense Sp7 supported growth of pea, tomato, and cucumber roots. Chemical analysis of exudates after one day of seedling incubation in water yielded differences between the exudates of the three plants. Most remarkably, cucumber seedling exudate did not contain detectable sugars...
March 1, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38422492/high-diversity-within-and-low-but-significant-genetic-differentiation-among-geographic-and-temporal-populations-of-the-global-streptococcus-pneumoniae
#6
JOURNAL ARTICLE
Jezreel Dalmieda, Megan Hitchcock, Jianping Xu
Streptococcus pneumoniae is the major cause of invasive pneumococcal disease (IPD). However, the global population structure remains largely unexplored. In this study, we investigated the spatial and temporal patterns of genetic variation of S. pneumoniae based on archived multilocus sequence typing data from PubMLST.org. Our analyses demonstrated both shared and unique distributions of sequence types (STs) and allele types among regional populations. Among the 17,915 global STs, 36 representing 15,263 isolates were broadly shared among all six continents, consistent with recent clonal dispersal and expansion of this pathogen...
February 29, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38415613/qsvr-and-opar-coordinately-regulate-the-transcription-of-cpss-and-cpsr-in-vibrio-parahaemolyticus
#7
JOURNAL ARTICLE
Xue Li, Wei Lian, Miaomiao Zhang, Xi Luo, Yiquan Zhang, Renfei Lu
Vibrio parahaemolyticus , the leading cause of seafood-associated gastroenteritis, has a strong capacity to form biofilms on surfaces, which is strictly regulated by the CpsS-CpsR-CpsQ regulatory cascade. OpaR, a master regulator of quorum sensing, is a global regulator that controls multiple cellular pathways including biofilm formation and virulence. QsvR is an AraC-type regulator that works coordinately with OpaR to control biofilm formation and virulence gene expression of V. parahaemolyticus . QsvR and OpaR activate cpsQ transcription...
February 28, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38354391/do-we-still-need-illumina-sequencing-data-evaluating-oxford-nanopore-technologies-r10-4-1-flow-cells-and-the-rapid-v14-library-prep-kit-for-gram-negative-bacteria-whole-genome-assemblies
#8
JOURNAL ARTICLE
Nicole A Lerminiaux, Ken Fakharuddin, Michael Mulvey, Laura Mataseje
The best whole genome assemblies are currently built from a combination of highly accurate short-read sequencing data and long-read sequencing data that can bridge repetitive and problematic regions. Oxford Nanopore Technologies (ONT) produce long-read sequencing platforms and they are continually improving their technology to obtain higher-quality read data that is approaching the quality obtained from short-read platforms such as Illumina. As these innovations continue, we evaluated how much ONT read coverage produced by the Rapid Barcoding Kit v14 (SQK-RBK114) is necessary to generate high-quality hybrid and long-read-only genome assemblies for a panel of carbapenemase-producing Enterobacterales bacterial isolates...
February 14, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38350082/characterization-of-hydrocarbon-degraders-from-northwest-passage-beach-sediments-and-assessment-of-their-ability-for-bioremediation
#9
JOURNAL ARTICLE
Antoine-Olivier Lirette, Ya-Jou Chen, Nastasia J Freyria, Esteban Góngora, Charles Greer, Lyle Whyte
Global warming-induced sea ice loss in the Canadian Northwest Passage (NWP) will result in more shipping traffic, increasing the risk of oil spills. Microorganisms inhabiting NWP beach sediments may degrade hydrocarbons, offering a potential bioremediation strategy. In this study, the characterization and genomic analyses of 22 hydrocarbon-biodegradative bacterial isolates revealed that they contained a diverse range of key alkane and aromatic hydrocarbon-degradative genes as well as cold and salt tolerance genes indicating they are highly adapted to the extreme Arctic environment...
February 13, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38314685/genome-and-transcriptome-sequencing-of-trichoderma-harzianum-t4-an-important-biocontrol-fungus-of-rhizoctonia-solani-reveals-genes-related-to-mycoparasitism
#10
JOURNAL ARTICLE
Yaping Wang, Jian Wang, Xiaochong Zhu, Wei Wang
Trichoderma harzianum is a well-known biological control strain and a mycoparasite of Rhizoctonia solani . To explore the mechanisms of mycoparasitism, the genome and transcriptome of T. harzianum T4 were both assembled and analyzed in this study. The genome of T. harzianum T4 was assembled into 106 scaffolds, sized 41.25 Mb, and annotated with a total of 8118 predicted genes. We analyzed the transcriptome of T. harzianum T4 against R. solani in a dual culture in three culture periods: before contact (BC), during contact (C), and after contact (AC)...
February 5, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38232349/unveiling-the-fungal-color-palette-pigment-analysis-of-fusarium-solani-species-complex-and-curvularia-verruculosa-clinical-isolates
#11
JOURNAL ARTICLE
Luis Enrique Chaves-González, Daniela Jaikel-Víquez, Stefany Lozada-Alvarado, Fabio Granados-Chinchilla
Fungal species in the Nectriaceae, such as Fusarium spp. (Hypocreales: Nectriaceae) are etiologic agents of hyalohyphomycosis capable of producing violaceous or yellowish pigments under certain conditions, while Curvularia spp. (Pleosporales: Pleosporaceae) are agents of phaeohyphomycosis and typically produce melanin in their cell walls. In nectriaceous and pleosporaceous fungi, these pigments are mainly constituted by polyketides (e.g., azaphilones, naphthoquinones, hydroxyanthraquinones). Considering the importance of pigments synthesized by these genera, this work focused on the selective extraction of pigments produced by eight Fusarium solani species complex (FSSC) and one Curvularia verruculosa isolate recovered from dermatomycosis specimens, their separation, purification, and posterior chemical analysis...
January 17, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38190652/regulation-of-virulence-mechanisms-in-plant-pathogenic-streptomyces
#12
JOURNAL ARTICLE
Corrie V Vincent, Dawn Bignell
Streptomyces have a uniquely complex developmental life cycle that involves the coordination of morphological differentiation with the production of numerous bioactive specialized metabolites. The majority of Streptomyces spp. are soil dwelling saprophytes, while plant pathogenicity is a rare attribute among members of this genus. Phytopathogenic Streptomyces are responsible for economically important diseases such as common scab, which affects potato and other root crops. Following the acquisition of genes encoding virulence factors, Streptomyces pathogens are expected to have specifically adapted their regulatory pathways to enable transition from a primarily saprophytic to a pathogenic lifestyle...
January 8, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38176008/inhibition-of-the-type-iv-secretion-system-from-antibiotic-resistant-helicobacter-pylori-clinical-isolates-supports-the-potential-of-cag%C3%AE-as-an-anti-virulence-target
#13
JOURNAL ARTICLE
Flore Oudouhou, Claire Morin, Mickael Bouin, Christiane Gaudreau, Christian Baron
Helicobacter pylori resistance to antibiotics is a growing problem and it increasingly leads to treatment failure. While the bacterium is present worldwide, the severity of clinical outcomes is highly dependent on the geographical origin and genetic characteristics of the strains. One of the major virulence factors identified in H. pylori is the cag pathogenicity island (cagPAI), which encodes a type IV secretion system used to translocate effectors into human cells. Here, we investigated the genetic variability of the cagPAI among 13 antibiotic-resistant H...
January 4, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38164935/note-of-appreciation
#14
JOURNAL ARTICLE
(no author information available yet)
No abstract text is available yet for this article.
January 1, 2024: Canadian Journal of Microbiology
https://read.qxmd.com/read/38134414/enterococcus-faecium-inhibits-nf-%C3%AE%C2%BAb-nlrp3-caspase-1-signaling-pathway-to-antagonize-enterotoxigenic-escherichia-coli-mediated-inflammatory-response
#15
JOURNAL ARTICLE
Huibin Zheng, Sicheng Pu, Jiahao Liu, Falong Yang, Dechun Chen
Enterotoxigenic Escherichia coli (ETEC) can cause intestinal inflammation and diarrhea in yaks, which has a negative impact on their economic value. In recent years, probiotics have gained increasing attention as a pure, natural, non-toxic, harmless, and residue-free additive. However, the underlying mechanisms by which probiotics safeguard against ETEC are not completely elucidated. This study aimed to investigate the protective effect of Enterococcus faecium (E. faecium) against ETEC infection in mice through oral gavage...
December 22, 2023: Canadian Journal of Microbiology
https://read.qxmd.com/read/38096506/hydrogen-sulfide-regulates-arsenic-induced-cell-death-in-yeast-cells-by-modulating-the-antioxidative-system
#16
JOURNAL ARTICLE
Lihua Wu, Xia Yao, Haiyan Li, Yanfei Chen
Arsenic (As) is a metal with potentially toxic effects on different organisms. Hydrogen sulfide (H2S) plays a vital role in alleviating heavy metal toxicity through reducing oxidative stress in plants and animals. However, the function of H2S in alleviating arsenic toxicity in yeast cells remains unclear. In this study, we investigated the effects of NaHS (exogenous physiological H2S) on cell death and its possible mechanism in yeast cells induced by sodium arsenite. Our results showed that sodium arsenite could induce yeast cell death, and pretreatment with 0...
December 14, 2023: Canadian Journal of Microbiology
https://read.qxmd.com/read/38096505/changes-in-the-soil-fungal-communities-of-steppe-grasslands-at-varying-degradation-levels-in-north-china
#17
JOURNAL ARTICLE
Qiqi Han, Yuhang Chen, Zichao Li, Zhuo Zhang, Yuao Qin, Zhongkuan Liu, Guixia Liu
Studying the microbial community of grassland degradation is of great significance for grassland restoration. Thus, we used an Illumina HiSeq PE250 high-throughput sequencing platform to study the changing characteristics of soil fungal communities in degraded grasslands, which were categorized as non-degraded (ND), lightly degraded (LD), moderately degraded (MD), and severely degraded (SD). Moreover, a correlation analysis between soil physical and chemical properties and fungal communities was completed. The results showed that the number of plant species, vegetation coverage, aboveground biomass, and diversity index decreased significantly with increasing degradation, and there were significant differences in the physical and chemical properties of the soil among the different degraded grasslands...
December 14, 2023: Canadian Journal of Microbiology
https://read.qxmd.com/read/38063167/wild-fish-from-a-highly-urbanized-river-orge-france-as-vectors-of-culturable-enterobacterales-resistant-to-antibiotics
#18
JOURNAL ARTICLE
Anne-Laure Vivant, Etienne Marchand, Benjamin Janvier, Thierry Berthe, Elodie Guigon, Nathalie Grall, Fabrice Alliot, Aurélie Goutte, Fabienne Petit
This study shows how wild fishes from urbanized rivers could be involved in the spread of antibiotic-resistant Enterobacterales . Antibiotic resistance profiles and molecular detection of clinical integron ( IntI 1) were carried out on 105 Enterobacterales isolated from 89 wildfish (skin or gut) belonging to 8 species. The proportion of isolates resistant to at least one antibiotic was independent of fish species and reached 28.3% within the Escherichia coli ( E. coli ) population and 84.7% in the non- E.coli Enterobacterales ...
December 8, 2023: Canadian Journal of Microbiology
https://read.qxmd.com/read/38061385/genomic-characterization-of-three-bacterial-isolates-antagonistic-to-the-pea-root-rot-pathogen-aphanomyces-euteiches
#19
JOURNAL ARTICLE
Zakir Hossain, Michelle Hubbard
Microorganisms living in soil and rhizosphere or inside plants can promote plant growth and health. Genomic characterization of beneficial microbes could shed light on their special features. Through extensive field survey across Saskatchewan, Canada, followed by in vitro and greenhouse characterization, we identified several bacterial isolates antagonistic to pea root rot pathogen Aphanomyces euteiches . In this study, the genomes of three isolates- Pseudomonas sp. rhizo 66 (PD-S66), Pseudomonas synxantha rhizo 25 (Ps-S25), and Serratia sp...
December 7, 2023: Canadian Journal of Microbiology
https://read.qxmd.com/read/38038227/time-to-treat-the-climate-and-nature-crisis-as-one-indivisible-global-health-emergency
#20
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
December 1, 2023: Canadian Journal of Microbiology
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