keyword
https://read.qxmd.com/read/38470120/distinct-dynamics-and-proximity-networks-of-hub-proteins-at-the-prey-invading-cell-pole-in-a-predatory-bacterium
#1
JOURNAL ARTICLE
Ophélie Remy, Yoann G Santin, Veronique Jonckheere, Coralie Tesseur, Jovana Kaljević, Petra Van Damme, Géraldine Laloux
In bacteria, cell poles function as subcellular compartments where proteins localize during specific lifecycle stages, orchestrated by polar "hub" proteins. Whereas most described bacteria inherit an "old" pole from the mother cell and a "new" pole from cell division, generating cell asymmetry at birth, non-binary division poses challenges for establishing cell polarity, particularly for daughter cells inheriting only new poles. We investigated polarity dynamics in the obligate predatory bacterium Bdellovibrio bacteriovorus , proliferating through filamentous growth followed by non-binary division within prey bacteria...
March 12, 2024: Journal of Bacteriology
https://read.qxmd.com/read/38428794/deciphering-the-core-bacterial-community-structure-and-function-and-their-response-to-environmental-factors-in-activated-sludge-from-pharmaceutical-wastewater-treatment-plants
#2
JOURNAL ARTICLE
Jinli Zheng, Xin Huang, Linjun Gao, Xu Xu, Lijun Hou, Tianming Cai, Shuyu Jia
Pharmaceutical wastewater is recognized for its heightened concentrations of organic pollutants, and biological treatment stands out as an effective technology to remove these organic pollution. Therefore, a comprehensive exploration of core bacterial community compositions, functions, and their responses to environmental factors in pharmaceutical wastewater treatment plants (PWWTPs) is important for understanding the removal mechanism of these organic pollutants. This study comprehensively investigated 36 activated sludge (AS) samples from 15 PWWTPs in China...
February 28, 2024: Environmental Pollution
https://read.qxmd.com/read/38382289/enhanced-biological-phosphorus-removal-sustained-by-aeration-free-filamentous-microalgal-bacterial-granular-sludge
#3
JOURNAL ARTICLE
Liaofan Tang, Mingming Gao, Shuang Liang, Shuguang Wang, Xinhua Wang
The microalgal-bacterial granular sludge (MBGS) based enhanced biological phosphorus removal (EBPR) (MBGS-EBPR) was recently proposed as a sustainable wastewater treatment process. Previous work showed the possibility of obtaining an MBGS-EBPR process starting from mature MBGS and phosphate-accumulating organisms (PAOs) enriched aerobic granular sludge (AGS) and validated the effectiveness of removing carbon/nitrogen/phosphorus with mechanical aeration. The present work evaluated whether the same could be achieved starting from conventional activated sludge and operating under aeration-free conditions in an alternating dark/light photo-sequencing batch reactor (PSBR)...
February 14, 2024: Water Research
https://read.qxmd.com/read/38358321/predatory-bacteria-prevent-the-proliferation-of-intraocular-serratia-marcescens-and-fluoroquinolone-resistant-pseudomonas-aeruginosa
#4
JOURNAL ARTICLE
Eric G Romanowski, Kimberly M Brothers, Rachel C Calvario, Nicholas A Stella, Tami Kim, Mennat Elsayed, Daniel E Kadouri, Robert M Q Shanks
Endogenous endophthalmitis caused by Gram-negative bacteria is an intra-ocular infection that can rapidly progress to irreversible loss of vision. While most endophthalmitis isolates are susceptible to antibiotic therapy, the emergence of resistant bacteria necessitates alternative approaches to combat intraocular bacterial proliferation. In this study the ability of predatory bacteria to limit intraocular growth of Pseudomonas aeruginosa , Serratia marcescens , and Staphylococcus aureus was evaluated in a New Zealand white rabbit endophthalmitis prevention model...
February 2024: Microbiology
https://read.qxmd.com/read/38295225/differential-abundances-of-bdellovibrio-and-rheinheimera-in-the-oral-microbiota-of-neonates-with-and-without-clinical-sepsis
#5
JOURNAL ARTICLE
Anucha Thatrimontrichai, Komwit Surachat, Kamonnut Singkhamanan, Paramee Thongsuksai
BACKGROUND: Neonatal sepsis is associated with high rates of morbidity and mortality, long hospital stays and high cost of care, thereby inflicting a burden on health care systems. Oral care with breast milk has been shown to modify the intestinal tract microbiota and immune system. Herein, we attempted to identify probiotics that may be beneficial to prevent or treat neonatal sepsis. METHODS: This was a secondary analysis comparing the microbiota during oropharyngeal care in very-low-birth-weight infants with and without clinical sepsis...
January 31, 2024: Pediatric Infectious Disease Journal
https://read.qxmd.com/read/38265430/-bdellovibrio-svalbardensis-sp-nov-a-newly-described-predator-isolated-from-svalbard-norway
#6
JOURNAL ARTICLE
Seong Yeol Choi, Wonsik Mun, Sumin Choi, Kyoung Lee, Robert J Mitchell
Identified as a newly described species from a biocrust in Svalbard, Norway (78° 54' 8.27″ N 12° 01' 20.34″ E), isolate PAP01T has different characteristics from any known predatory bacteria. The isolate was vibrio-shaped strain that employed flagellar motility. Phylogenetic analysis based on 16S rRNA gene sequences revealed that the isolate clustered within the genus Bdellovibrio in the family Bdellovibrionaceae . 16S rRNA gene sequence similarities between strain PAP01T and the type strain ( Bdellovibrio bacteriovorus HD100) was 95...
January 2024: International Journal of Systematic and Evolutionary Microbiology
https://read.qxmd.com/read/38243075/bdellovibrio-bacteriovorus-finds-its-prey
#7
JOURNAL ARTICLE
Andrea Du Toit
No abstract text is available yet for this article.
January 19, 2024: Nature Reviews. Microbiology
https://read.qxmd.com/read/38177296/bdellovibrio-bacteriovorus-uses-chimeric-fibre-proteins-to-recognize-and-invade-a-broad-range-of-bacterial-hosts
#8
JOURNAL ARTICLE
Simon G Caulton, Carey Lambert, Jess Tyson, Paul Radford, Asmaa Al-Bayati, Samuel Greenwood, Emma J Banks, Callum Clark, Rob Till, Elisabete Pires, R Elizabeth Sockett, Andrew L Lovering
Predatory bacteria, like the model endoperiplasmic bacterium Bdellovibrio bacteriovorus, show several adaptations relevant to their requirements for locating, entering and killing other bacteria. The mechanisms underlying prey recognition and handling remain obscure. Here we use complementary genetic, microscopic and structural methods to address this deficit. During invasion, the B. bacteriovorus protein CpoB concentrates into a vesicular compartment that is deposited into the prey periplasm. Proteomic and structural analyses of vesicle contents reveal several fibre-like proteins, which we name the mosaic adhesive trimer (MAT) superfamily, and show localization on the predator surface before prey encounter...
January 2024: Nature Microbiology
https://read.qxmd.com/read/38104663/ecological-succession-and-community-assembly-of-mixed-microbial-culture-polyhydroxyalkanoate-production-systems-drivers-of-polyhydroxyalkanoate-synthesis-and-bdellovibrio-predation
#9
JOURNAL ARTICLE
Shaojiao Liu, Zhiqiang Chen, Baozhen Liu, Qinxue Wen, Zifan Wang, Xiao Lin, Yuhan Wang
The production of polyhydroxyalkanoate (PHA) by mixed microbial culture (MMC) can reduce the pollution of plastics. Ecophysiological study of the microbial community assembly and succession is helpful for comprehensive understanding the MMC PHA production process. The operation mode of sequential aerobic dynamic discharge - aerobic dynamic feeding (ADD-ADF) was applied and the operation can be divided into acclimation phase and maturation phase. Deterministic process caused by selective pressure dominated the community assembly throughout the operation...
December 15, 2023: Bioresource Technology
https://read.qxmd.com/read/38041588/effect-of-predatory-bacterial-mixtures-on-biolysis-of-waste-activated-sludge-to-improve-dewatering-performance
#10
JOURNAL ARTICLE
Zeyu Wu, Huan Gao, Zhoukai Chen, Wenqiang Su, Yongfang Jie, Jian Zhu, Ran Yu
The generation of surplus sludge during biological wastewater treatment has become a prevalent issue, necessitating the development of a dewatering approach that is efficient, economically feasible, and ecologically sound. Bdellovibrio-and-like organisms (BALOs) are obligatory parasitic bacteria that prey on an array of bacteria . In this study, different BALO strains were isolated and purified from waste activited sludge (WAS). Anti-predation host strains were applied to screen the BALO strains with different host-range to minimize the overlap of the biolysis prey spectrum...
December 2, 2023: Environmental Technology
https://read.qxmd.com/read/37898345/predatory-bacteria-loaded-in-situ-forming-hydrogels-against-drug-resistant-bacteria-induced-corneal-infection
#11
JOURNAL ARTICLE
Yan Liu, Wanting Guo, Wanmei Wang, Hui Zhang, Yiguang Jin
The development of potent bactericidal antibiotic alternatives is important to address the current antibiotic crisis. A representative example is the topical delivery of predatory Bdellovibrio bacteriovorus bacteria to treat ocular bacterial infection. However, the direct topical use of B. bacteriovorus suspensions has the problem of easy loss and inactivation. Here, a B. bacteriovorus in situ forming hydrogel (BIG) was constructed for the ocular delivery of B. bacteriovorus. BIGs, as a fluid in their primitive state, were temperature- and cation- dually sensitive, which was rapidly transformed into immobile gels in the ocular environment...
October 26, 2023: Journal of Controlled Release
https://read.qxmd.com/read/37878182/treatment-of-phenolic-wastewater-by-anaerobic-fluidized-bed-microbial-fuel-cell-using-carbon-brush-as-anode-microbial-community-analysis-and-m-cresol-degradation-mechanism
#12
JOURNAL ARTICLE
Zhaoxin Zhou, Xinmin Liu, Ranran Chen, Xiude Hu, Qingjie Guo
Anaerobic fluidized bed microbial fuel cell (AFB-MFC) is a technology that combines fluidized bed reactor and microbial fuel cell to treat organic wastewater and generate electricity. The performance and the mechanism of treating m-cresol wastewater in AFB-MFC using carbon brush as biofilm anode were studied. After 48 h of operation, the m-cresol removal efficiency of AFB-MFC, MAR-AFB (fluidized bed bioreactor with acclimated anaerobic sludge), MAR-FB (ordinary fluidized bed reactor with only macroporous adsorptive resin) and AST (traditional anaerobic sludge treatment) were 95...
October 25, 2023: Bioprocess and Biosystems Engineering
https://read.qxmd.com/read/37814071/histones-with-an-unconventional-dna-binding-mode-in-vitro-are-major-chromatin-constituents-in-the-bacterium-bdellovibrio-bacteriovorus
#13
JOURNAL ARTICLE
Antoine Hocher, Shawn P Laursen, Paul Radford, Jess Tyson, Carey Lambert, Kathryn M Stevens, Alex Montoya, Pavel V Shliaha, Mathieu Picardeau, R Elizabeth Sockett, Karolin Luger, Tobias Warnecke
Histone proteins bind DNA and organize the genomes of eukaryotes and most archaea, whereas bacteria rely on different nucleoid-associated proteins. Homology searches have detected putative histone-fold domains in a few bacteria, but whether these function like archaeal/eukaryotic histones is unknown. Here we report that histones are major chromatin components in the bacteria Bdellovibrio bacteriovorus and Leptospira interrogans. Patterns of sequence evolution suggest important roles for histones in additional bacterial clades...
October 9, 2023: Nature Microbiology
https://read.qxmd.com/read/37797869/protective-effects-of-sulforaphane-on-inflammation-oxidative-stress-and-intestinal-dysbacteriosis-induced-by-triphenyltin-in-cyprinus-carpio-haematopterus
#14
JOURNAL ARTICLE
Jianshuang Ma, Bingke Wang, Changchang Pu, Kuo Chang, Yinfeng Cheng, Ruyi Sun, Qian Qi, Ruiyi Xu, Junliang Chen, Chunnuan Zhang
The purpose of this experiment was to study the mitigation effect of sulforaphane (SFN) on fish toxicological damage caused by triphenyltin (TPT) pollution. A total of 320 healthy fish (56.9 ± 0.4g) were randomly placed into four groups, each with four duplicates. The control group was fed the basal diet, the TPT group was exposed to 10 ng/L TPT on the basis of the control group, the SFN group was fed a diet supplemented with 10 mg/kg SFN, the SFN + TPT group was exposed to 10 ng/L TPT on the basis of the SFN group...
October 3, 2023: Fish & Shellfish Immunology
https://read.qxmd.com/read/37791401/chromosome-structure-and-dna-replication-dynamics-during-the-life-cycle-of-the-predatory-bacterium-bdellovibrio-bacteriovorus
#15
JOURNAL ARTICLE
Karolina Pląskowska, Jolanta Zakrzewska-Czerwińska
Bdellovibrio bacteriovorus, an obligate predatory Gram-negative bacterium that proliferates inside and kills other Gram-negative bacteria, was discovered more than 60 years ago. However, we have only recently begun to understand the detailed cell biology of this proficient bacterial killer. B. bacteriovorus exhibits a peculiar life cycle and bimodal proliferation, and thus represents an attractive model for studying novel aspects of bacterial cell biology. The life cycle of B. bacteriovorus consists of two phases: a free-living non-replicative attack phase and an intracellular reproductive phase...
October 3, 2023: FEMS Microbiology Reviews
https://read.qxmd.com/read/37780591/predatory-bacteria-as-potential-biofilm-control-and-eradication-agents-in-the-food-industry
#16
REVIEW
Wonsik Mun, Seong Yeol Choi, Sumudu Upatissa, Robert J Mitchell
Biofilms are a major concern within the food industry since they have the potential to reduce productivity in situ (within the field), impact food stability and storage, and cause downstream food poisoning. Within this review, predatory bacteria as potential biofilm control and eradication agents are discussed, with a particular emphasis on the intraperiplasmic Bdellovibrio -and-like organism (BALO) grouping. After providing a brief overview of predatory bacteria and their activities, focus is given to how BALOs fulfill four attributes that are essential for biocontrol agents to be successful in the food industry: (1) Broad spectrum activity against pathogens, both plant and human; (2) Activity against biofilms; (3) Safety towards humans and animals; and (4) Compatibility with food...
October 2023: Food Science and Biotechnology
https://read.qxmd.com/read/37777134/sludge-floc-characteristics-and-microbial-community-in-high-rate-activated-sludge-and-high-rate-membrane-bioreactor-for-organic-recovery
#17
JOURNAL ARTICLE
Pratamaporn Homyok, Chaiwat Rongsayamanont, Sumeth Wongkiew, Tawan Limpiyakorn
High-rate activated sludge (HRAS) and membrane bioreactor (HRMBR) are considered as potential processes for organic recovery through bioflocculation and biosorption of particulate COD and colloidal COD with sludge flocs. In this study, bioflocculation and biosorption, in terms of sludge floc characteristics and microbial community, in HRAS and HRMBR was investigated in relation to organic recovery performance for low strength wastewater treatment. HRAS and HRMBR were operated at two different solids retention times (SRTs) of 2 and 0...
September 28, 2023: Science of the Total Environment
https://read.qxmd.com/read/37768346/the-assembly-of-gut-microbiota-implicates-shrimp-acute-hepatopancreas-necrosis-disease-progression
#18
JOURNAL ARTICLE
Jiaqi Lu, Jiangning Mao, Xuejing Qi, Jiong Chen, Jinbo Xiong
Ample evidence shows dysbiosis in the gut microbiota when comparing healthy shrimp with those affected by severe acute hepatopancreatic necrosis disease (AHPND). However, the static comparison used in available studies leads to the uncertainties regarding how and to what extent the gut microbiota responds to the progressive severity of AHPND. In addition, shrimp AHPND is featured by rapid and massive mortality, thus the initiation of AHPND must be diagnosed for preemptive therapy. For these reasons, we explored the ecological assembly of gut microbiota over shrimp AHPND progression...
September 28, 2023: Applied Microbiology and Biotechnology
https://read.qxmd.com/read/37745563/intra-ocular-predation-of-fluoroquinolone-resistant-pseudomonas-aeruginosa-and-serratia-marcescens-by-predatory-bacteria
#19
Eric G Romanowski, Kimberly M Brothers, Rachel C Calvario, Nicholas A Stella, Tami Kim, Mennat Elsayed, Daniel E Kadouri, Robert M Q Shanks
Endogenous endophthalmitis caused by Gram-negative bacteria is an intra-ocular infection that can rapidly progress to irreversible loss of vision. While most endophthalmitis isolates are susceptible to antibiotic therapy, the emergence of resistant bacteria necessitates alternative approaches to combat intraocular bacterial proliferation. In this study the ability of predatory bacteria to limit intraocular growth of Pseudomonas aeruginosa, Serratia marcescens, and Staphylococcus aureus was evaluated in a New Zealand White rabbit endophthalmitis prevention model...
September 19, 2023: bioRxiv
https://read.qxmd.com/read/37733798/cell-cycle-dependent-organization-of-a-bacterial-centromere-through-multi-layered-regulation-of-the-parabs-system
#20
JOURNAL ARTICLE
Jovana Kaljević, Coralie Tesseur, Tung B K Le, Géraldine Laloux
The accurate distribution of genetic material is crucial for all organisms. In most bacteria, chromosome segregation is achieved by the ParABS system, in which the ParB-bound parS sequence is actively partitioned by ParA. While this system is highly conserved, its adaptation in organisms with unique lifestyles and its regulation between developmental stages remain largely unexplored. Bdellovibrio bacteriovorus is a predatory bacterium proliferating through polyploid replication and non-binary division inside other bacteria...
September 2023: PLoS Genetics
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