Eduarda Araujo Dos Santos, Vítor Rodrigues Marin, Derlene Atilli de Angelis, Henrique Ferreira, Daiane Cristina Sass
{"title":"Isolation and anti-Xanthomonas citri activity of unguinol produced by Aspergillus unguis CBMAI 2140.","authors":"Eduarda Araujo Dos Santos, Vítor Rodrigues Marin, Derlene Atilli de Angelis, Henrique Ferreira, Daiane Cristina Sass","doi":"10.1093/lambio/ovaf016","DOIUrl":"https://doi.org/10.1093/lambio/ovaf016","url":null,"abstract":"<p><p>This research investigated active biomolecules from the endophytic fungus Aspergillus unguis (CBMAI 2140), isolated from Passiflora incarnata leaves, as potential antibacterial agents against Xanthomonas citri subsp. citri, the causative agent of citrus canker. The fungal extract was obtained via liquid-liquid extraction with ethyl acetate. Antibacterial activity was assessed using the Resazurin Microtiter Assay Plate (REMA), determining inhibitory concentrations (IC90) and the Minimum Bactericidal Concentration (MBC). The extract displayed microbicidal activity at 1050 µg.mL⁻¹ and inhibited bacterial growth at 350 µg.mL⁻¹. Fractionation of the extract via normal-phase column chromatography yielded six fractions, with fraction F11 showing the highest antibacterial potential (MBC: 200 µg.mL⁻¹). Nuclear magnetic resonance (NMR) analysis identified Unguinol as the main compound in F11. Fluorescence microscopy demonstrated rapid permeabilization of the X. citri cell membrane upon exposure to the compound, with significant effects observed after 15-30 minutes. Although no notable anti-biofilm activity was detected, this study represents the first report of Unguinol's antibacterial activity against Xanthomonas species. These findings highlight its potential for agricultural applications, contributing to sustainable development goal (SDG) 2.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143122936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Raziallah Jafari Jozani, Mauida F Hasoon Al Khallawi, Majed H Mohammed, Hanh Thi Hong Nguyen, Darren J Trott, Kiro Petrovski, Farhid Hemmatzadeh
{"title":"Development of a quantitative SYBR Green real-time PCR and microscopic slide culture for in vitro enumeration of Mycoplasma hyopneumoniae.","authors":"Raziallah Jafari Jozani, Mauida F Hasoon Al Khallawi, Majed H Mohammed, Hanh Thi Hong Nguyen, Darren J Trott, Kiro Petrovski, Farhid Hemmatzadeh","doi":"10.1093/lambio/ovaf011","DOIUrl":"https://doi.org/10.1093/lambio/ovaf011","url":null,"abstract":"<p><p>Mycoplasma hyopneumoniae's slow growth makes enumeration challenging using the traditional colony-forming unit (CFU) method. We introduced an innovative CFU-slide culture (CFU-SC) approach to address this issue. CFU-SC allows accurate counting of M. hyopneumoniae microcolonies, ranging from 7 to 50 µm, using high magnification. While comparing the accuracy of enumeration among CFU, CFU-SC, quantitative polymerase chain reaction (qPCR), and colour change unit (CCU), we found a robust positive correlation between qPCR and CFU-SC with colourCCU method for quantifying M. hyopneumoniae. Newly isolated strains exhibited the lowest Pearson correlation coefficient (r = 0.52) when comparing CFU and real-time PCR, while the highest coefficient (r = 0.86) was observed for the type strain J and new isolates using real-time PCR and CFU-SC. A consensus growth pattern was observed among all quantification methods, except CFU, between newly isolated strains and the type strain J. Notably, new isolates of M. hyopneumoniae showed no senescence phase after 228 h of cultivation, differing from the type strain J. The disparity in growth rate and pattern between new isolates and the type strain J is evident in the smaller agar microcolonies (7-10 µm) of the isolates, contrasting with the larger colonies (100-200 µm) of type strain J.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":"78 2","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143399551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"In-silico study of molecular adaptations in halophilic Cas9.","authors":"Anisha Debnath, Aveepsa Sengupta, Sujata Rudrapal, Ashutosh Kumar, Mamta Rani","doi":"10.1093/lambio/ovaf006","DOIUrl":"10.1093/lambio/ovaf006","url":null,"abstract":"<p><p>This study explores the structural adaptations of the CRISPR-Cas9 system in halophilic bacteria, focusing on Cas9 protein of halophilic bacterium Salicibibacter cibi. Protein sequences were analyzed using different tools such as ExPASy ProtParam for different physicochemical properties, Predictor of Natural Disordered Regions web server for disordered regions, and InterPro server and WebLogo for domains. Protein structures were generated using the AlphaFold database, and the quality of the modelled structure was checked through PROCHECK. The protein surface's amino acids and electrostatic potential were visualized using PyMOL, APBS server, and UCSF chimera. Comparative analysis revealed that halophilic Cas9 proteins possess a higher abundance of acidic residues, resulting in enhanced stability and hydration in saline conditions; halophilic Cas9 proteins also shows higher intrinsically disordered regions. Electrostatic potential maps confirmed that S. cibi Cas9 proteins maintain a highly negative surface charge, crucial for adaptation to salt-rich environments. These findings provide insights into the molecular mechanisms driving the structural and functional adaptations of Cas9 in salty environment, highlighting its potential applications in genome editing-based biotechnological approaches in extreme conditions.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jingqi Yan, Xiangying Zhao, Liping Liu, Jiaxiang Zhang, Jing Ma
{"title":"Production and characterization of levans with different molecular weights synthesized by Bacillus licheniformis ZM107.","authors":"Jingqi Yan, Xiangying Zhao, Liping Liu, Jiaxiang Zhang, Jing Ma","doi":"10.1093/lambio/ovaf015","DOIUrl":"10.1093/lambio/ovaf015","url":null,"abstract":"<p><p>Levan, a fructan-type polysaccharide with diverse applications in food, pharmaceuticals, and biotechnology, has garnered significant attention for its functional properties, such as prebiotic, immunomodulatory, antioxidant, and antimicrobial activities. In this study, the effects of fermentation temperature, sucrose concentration, and incubation time on the molecular weight of levan produced by Bacillus licheniformis fermentation were investigated. The results showed that as the temperature (37°C-50°C) and sucrose concentration (300-500 g l-1) increased, the molecular weight of levan produced by the strain during fermentation decreased. At the same time, the molecular weight initially increased and then decreased with longer culture times, indicating that levan within a specific size range could be produced by controlling the fermentation conditions. In addition, the properties and characteristics of levan produced by fermentation at two molecular weights (HML and LML) were compared. The results showed that molecular weight significantly affected the micromorphology, thermal behavior, rheological properties, and prebiotic activity of levan. Therefore, this study demonstrated that Bacillus licheniformis SFLV-ZM107 can produce low molecular weight levan, and its molecular weight can be controlled through fermentation conditions. Consequently, the properties and functions of levan can be influenced, allowing the production of levans with the desired characteristics.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A review of the environmental spread of Salmonella enterica serovars through water in Africa.","authors":"Akeem Ganiyu Rabiu, Oyinkansola Fadiji, Ayodele Timilehin Adesoji, Simiat Olanike Jimoh, Sohyun Cho","doi":"10.1093/lambio/ovaf005","DOIUrl":"10.1093/lambio/ovaf005","url":null,"abstract":"<p><p>Salmonella is an enteric pathogenic bacterium in mammals that thrives in sewage, soil, and aquatic environments because of its wide ecological adaptability. The spread of Salmonella infection is associated with a lack of clean water, poor hygiene, and poor sanitation in developing countries. However, the input of Salmonella-contaminated surface water and groundwater in the environmental dissemination of antimicrobial-resistant Salmonella is obscure outside developed countries. This study aimed to assess literature that described Salmonella from groundwater, surface water, and treated water in Africa and profiled the bacteria for antimicrobial resistance (AMR). We seek to highlight the pitfalls in S. enterica identification schemes and determine the entry routes of S. enterica into surface water and groundwater to comprehend the spread patterns of S. enterica through the water ecosystem. Salmonella was frequently recovered not only from groundwater but also from unprotected springs and river water in Africa. However, the insufficiency of standard methods limited the speciation of the bacteria and only a few studies determined the isolates' AMR patterns. Integrating the Salmonella surveillance in environmental and treated water into the global Salmonella surveillance can assist in controlling typhoid fever spread and generally reduce the burden of waterborne infections in Africa.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143029129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Hospital environment as reservoir of Pseudomonas aeruginosa in human cases: a molecular epidemiology investigation in a hospital setting in central Italy.","authors":"Adele Lombardi, Manuela Tamburro, Michela Lucia Sammarco, Giancarlo Ripabelli","doi":"10.1093/lambio/ovaf019","DOIUrl":"10.1093/lambio/ovaf019","url":null,"abstract":"<p><p>Pseudomonas aeruginosa is one of the main causes of hospital infections that are difficult to manage because of multidrug resistance (MDR). The aim of this study was to describe a molecular investigation on 19 clinical and 14 isolates from the environment in the Hub hospital of the Molise region, central Italy. Antimicrobial susceptibility was evaluated using BD Phoenix™ Automated Microbiology System. Pulsed-field gel electrophoresis (PFGE) with SpeI, enterobacterial repetitive intergenic consensus (ERIC-PCR), and random amplified polymorphic DNA-PCR were performed for genotyping. All 33 P. aeruginosa showed MDR phenotype. PFGE had 0.99 discriminatory power, underlining high heterogeneity among the strains. The genetic relatedness between two human isolates (H12 and H15) from neonatal intensive care (NICU) and one environmental strain (E1) collected from siphon of sink in the delivery room was noticeable, as well as between one strain from faucet in NICU (E2) and siphon sink (E5) from delivery room. The link between H12, H15, and E1 strains was corroborated by ERIC-PCR showing epidemiological concordance, although with a lower discriminatory power. The study findings strengthened the critical correlation between clinical P. aeruginosa and environment, according to previous molecular surveys on outbreaks occurred in Italy.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143391315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nikita Kundu, Smriti Yadav, Ananya Bhattacharya, G K Aseri, Neelam Jain
{"title":"Constructed wetland-microbial fuel cell (CW-MFC) mediated bio-electrodegradation of azo dyes from textile wastewater.","authors":"Nikita Kundu, Smriti Yadav, Ananya Bhattacharya, G K Aseri, Neelam Jain","doi":"10.1093/lambio/ovaf010","DOIUrl":"10.1093/lambio/ovaf010","url":null,"abstract":"<p><p>Azo dyes constitute 60%-70% of commercially used dyes and are complex, carcinogenic, and mutagenic pollutants that negatively impact soil composition, water bodies, flora, and fauna. Conventional azo dye degradation techniques have drawbacks such as high production and maintenance costs, use of hazardous chemicals, membrane clogging, and sludge generation. Constructed wetland-microbial fuel cells (CW-MFCs) offer a promising sustainable approach for the bio-electrodegradation of azo dyes from textile wastewater. CW-MFCs harness the phytodegradation capabilities of wetland plants like Azolla, water hyacinth, and Ipomoea, along with microalgae such as Nostoc, Oscillatoria, Chlorella, and Anabaena, to break down azo dyes into aromatic amines. These intermediates are then reduced to CO2 and H2O by microalgae in the fuel cells while simultaneously generating electricity. CW-MFCs offer advantages including low cost, sustainability, and use of renewable energy. The valorization of the resulting algal and plant biomass further enhances the sustainability of this approach, as it can be used for biofuel production, nutraceuticals, pharmaceuticals, and bio-composting. Implementing CW-MFCs as a tertiary treatment step in textile industries aligns with the circular economy concept and contributes to achieving several sustainable development goals.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143039326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Chen, Jun Zhou, Xin Li, Xin-Yao Li, Shi-Xiu Qiu, Zhen-Ying Xu, Jian-Xia Yang, Yuan-Ting Zhu, Xin-Rui Zhang, Lang Yan
{"title":"Phenotypic and genomic characterization of Levilactobacillus brevis YT108: a potential probiotic strain capable of metabolizing xylo-oligosaccharides.","authors":"Yang Chen, Jun Zhou, Xin Li, Xin-Yao Li, Shi-Xiu Qiu, Zhen-Ying Xu, Jian-Xia Yang, Yuan-Ting Zhu, Xin-Rui Zhang, Lang Yan","doi":"10.1093/lambio/ovaf014","DOIUrl":"10.1093/lambio/ovaf014","url":null,"abstract":"<p><p>Levilactobacillus brevis YT108, identified for its ability to metabolize prebiotic xylo-oligosaccharides (XOS), emerges as a candidate for probiotic use in synbiotic food formulations. This study aimed to investigate the metabolic and genomic traits associated with XOS metabolism in YT108 and to assess its probiotic attributes through whole genome sequencing and in vitro assays. Strain YT108 exhibited robust growth kinetics on XOS as the sole carbon source, with a growth profile comparable to that on glucose, achieving a pH reduction to 4.68 and an OD600nm of 1.603 after 48 h. Three key gene clusters (xylCDEPFRT, xylHTG, and xylABT) and key enzymes (1,4-β-xylosidase) were identified as potentially involved in XOS metabolism. In vitro assays confirmed the strain's remarkable physiological properties, including tolerance to acid, bile, heat, and NaCl, as well as resistance to simulated gastrointestinal juices and antioxidant capacity. Furthermore, strain YT108 was sensitive to five commonly used antibiotics and lacked transferable resistance genes. Taken together, these results highlight the potential of L. brevis YT108 as a probiotic candidate with beneficial traits for XOS utilization, suggesting its promising application in the formulation of next-generation synbiotic products.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143066460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kirsten M Zwally, Elizabeth Holda, Isaac Perez, Phillip E Kaufman, Brandon Lyons, Giridhar Athrey, T Matthew Taylor
{"title":"Detection and antimicrobial resistance profiles of Salmonella enterica recovered from house fly intestinal tracts and environments of selected broiler farms in Texas.","authors":"Kirsten M Zwally, Elizabeth Holda, Isaac Perez, Phillip E Kaufman, Brandon Lyons, Giridhar Athrey, T Matthew Taylor","doi":"10.1093/lambio/ovaf007","DOIUrl":"10.1093/lambio/ovaf007","url":null,"abstract":"<p><p>The entry of drug-resistant Salmonella enterica into the food supply is a challenge to public health and food safety. One emerging concern is the role of synanthropic insects for moving microbial pathogens throughout poultry production systems, where insects commonly thrive. We investigated the presence and phenotypic antimicrobial susceptibility of S. enterica from insect and environmental samples from broiler farms. Insects were collected throughout the broiler house and adjacent compost barn. Environmental samples (poultry feed, drinking water, fresh litter, and feces) were collected simultaneously (n = 80). Insect gastrointestinal tracts were dissected and pooled (n = 57). Recovered Salmonella isolates were serotyped and subjected to antimicrobial susceptibility testing against 14 medically important antimicrobials. Overall, six isolates were recovered from 137 total samples (4.4%): 3.5% (2/57) from adult house flies (Musca domestica), 15% (3/20) from poultry feed, and 4.8% (1/21) from litter. Salmonella Montevideo (16.7%; 1/6), Typhimurium (33.3%; 2/6), and Kentucky (50%, 3/6) were identified. All but one Salmonella isolate (83.3%; 5/6) demonstrated resistance to at least one antimicrobial. Further research should investigate movement patterns between broiler operations and food processing facilities to establish efficient biosecurity measures to prevent any instances of foodborne pathogen transmission into human food systems.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Common mycorrhizal networks enhance growth and nutrient uptake in non-mycorrhizal Chenopodium album via Parthenium hysterophorus.","authors":"Ambika Chauhan, Mankeet Kaur, Meenakshi Singh, Pradeep Kumar Singh","doi":"10.1093/lambio/ovaf009","DOIUrl":"10.1093/lambio/ovaf009","url":null,"abstract":"<p><p>Common mycorrhizal networks (CMNs) facilitate nutrient transfer between plants, but their role in supporting non-mycorrhizal species remains largely unexplored. This study investigates the effect of CMNs on the growth and nutrient uptake of the non-mycorrhizal plant Chenopodium album in association with the mycorrhizal plant Parthenium hysterophorus. The treatments included C. album alone, C. album grown with P. hysterophorus to allow CMN formation, and C. album treated with fungicide to inhibit mycorrhizal activity. Results showed that CMN treatment significantly enhanced the plant growth and uptake of nutrient content (N and P) in C. album compared to the control. There was no mycorrhizal colonization in C. album, while high colonization in P. hysterophorus suggested that the enhanced growth in C. album was due to nutrient uptake transfer through the CMNs. The fungicide treatment resulted in reduced growth and uptake of nutrient content, providing further evidence that CMNs and mycorrhizal associations of mycorrhizal plants enhanced the growth of C. album. These findings provide the first evidence that CMNs can enhance the growth and nutrient uptake of non-mycorrhizal plants through associations with mycorrhizal partners.</p>","PeriodicalId":17962,"journal":{"name":"Letters in Applied Microbiology","volume":" ","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}