Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology最新文献

{"title":"Mesobacterium hydrothermale sp. nov., isolated from shallow-sea hydrothermal systems off Kueishantao Island","authors":"Zhiyi Su,&nbsp;Yue Xu,&nbsp;Yuhang Xiao,&nbsp;Beihan Chen,&nbsp;Xuanyun Qiu,&nbsp;Jianing Ye,&nbsp;Kai Tang","doi":"10.1007/s10482-024-01994-6","DOIUrl":"10.1007/s10482-024-01994-6","url":null,"abstract":"<div><p>A Gram-negative, rod-shaped, non-motile, aerobic bacterium, designated as strain TK19101^T, was isolated from the intermediate seawater of yellow vent in the shallow-sea hydrothermal system located near Kueishantao Island. The strain was found to grow at 10–40 °C (optimum, 35 °C), at pH 6.0–8.0 (optimum, 7.0), and in 0–5% (w/v) NaCl (optimum, 1%). Strain TK19101^T was catalase-positive and oxidase-positive. The predominant fatty acids (&gt; 10%) in strain TK19101^T cells were C_16:0, summed feature 8 (C_18:1 <i>ω</i>6<i>c</i> and/or C_18:1 <i>ω</i>7<i>c</i>), and C_18:0. The predominant isoprenoid quinone of strain TK19101^T was ubiquinone-10. The polar lipids of strain TK19101^T comprised phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, phospholipid, and unknown polar lipid. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain TK19101^T belonged to the genus <i>Mesobacterium</i>. Strain TK19101^T exhibited highest 16S rRNA gene sequence similarity value to <i>Mesobacterium pallidum</i> MCCC M24557^T (97.48%). The estimated average nucleotide identity and digital DNA-DNA hybridization values between strain TK19101^T and the closest related species <i>Mesobacterium pallidum</i> MCCC M24557^T were 74.88% and 20.30%, respectively. The DNA G + C content was 63.49 mol%. On the basis of the analysis of 16S rRNA gene sequences, genotypic and phylogenetic data, strain TK19101^T has a unique phylogenetic status and represents a novel species of genus <i>Mesobacterium</i>, for which the name <i>Mesobacterium hydrothermale</i> sp. nov. is proposed. The type strain is TK19101^T (= MCCC 1K08936^T = KCTC 8354^T).</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141494155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biocontrol potential of plant growth-promoting rhizobacteria against plant disease and insect pest","authors":"Qinhao Jian,&nbsp;Tongrui Zhang,&nbsp;Yingying Wang,&nbsp;Li Guan,&nbsp;Linlin Li,&nbsp;Longna Wu,&nbsp;Shiyan Chen,&nbsp;Yumei He,&nbsp;Hong Huang,&nbsp;Shugang Tian,&nbsp;Hu Tang,&nbsp;Litang Lu","doi":"10.1007/s10482-024-01975-9","DOIUrl":"10.1007/s10482-024-01975-9","url":null,"abstract":"<div><p>Biological control is a promising approach to enhance pathogen and pest control to ensure high productivity in cash crop production. Therefore, PGPR biofertilizers are very suitable for application in the cultivation of tea plants (<i>Camellia sinensis</i>) and tobacco, but it is rarely reported so far. In this study, production of a consortium of three strains of PGPR were applied to tobacco and tea plants. The results demonstrated that plants treated with PGPR exhibited enhanced resistance against the bacterial pathogen <i>Pseudomonas syringae</i> (PstDC3000). The significant effect in improving the plant's ability to resist pathogen invasion was verified through measurements of oxygen activity, bacterial colony counts, and expression levels of resistance-related genes (<i>NPR1</i>, <i>PR1</i>, <i>JAZ1</i>, <i>POD</i> etc.). Moreover, the application of PGPR in the tea plantation showed significantly reduced population occurrences of tea green leafhoppers (<i>Empoasca onukii Matsuda</i>), tea thrips (<i>Thysanoptera:Thripidae</i>), <i>Aleurocanthus spiniferus</i> (<i>Quaintanca</i>) and alleviated anthracnose disease in tea seedlings. Therefore, PGPR biofertilizers may serve as a viable biological control method to improve tobacco and tea plant yield and quality. Our findings revealed part of the mechanism by which PGPR helped improve plant biostresses resistance, enabling better application in agricultural production.</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141472221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Denitrificimonas halotolerans sp. nov., a novel species isolated from UASB sludge treating landfill leachate","authors":"Shanhui Wang,&nbsp;Chu Yuan,&nbsp;Chengbin Xu,&nbsp;Ditian Li,&nbsp;Han Zhang,&nbsp;Jing Wang,&nbsp;Xin Wang,&nbsp;Yan Li,&nbsp;Dian Jiao,&nbsp;Siliang Yuan,&nbsp;Han Chen,&nbsp;Dongru Qiu","doi":"10.1007/s10482-024-01987-5","DOIUrl":"10.1007/s10482-024-01987-5","url":null,"abstract":"<div><p>A Gram-stain-negative, facultative anaerobe, rod-shaped strain JX-1^T was isolated from UASB sludge treating landfill leachate in Wuhan, China. The isolate is capable of growing under conditions of pH 6.0–11.0 (optimum, pH 7.0–8.0), temperature 4–42 ℃ (optimum, 20–30 ℃), 0–8.0% (w/v) NaCl (optimum, 5.0%), and ammonia nitrogen concentration of 200–5000 mg/L (optimum, 500 mg/L) on LB plates. The microorganism can utilize malic acid, D-galactose, L-rhamnose, inosine, and L-glutamic acid as carbon sources, but does not reduce nitrates and nitrites. The major fatty acids are C_18:1ω7c/C_18:1ω6c, iso-C_15:0, and anteiso-C_15:0. The respiratory quinones are Q9 (91.92%) and Q8 (8.08%). Polar lipids include aminolipid, aminophospholipid, diphosphatidylglycerol, glycolipid, phosphatidylethanolamine, phosphatidylglycerol, and phospholipid. Compared with other strains, strain JX-1^T and <i>Denitrificimonas caeni</i> HY-14^T have the highest values in terms of 16S rRNA gene sequence similarity (96.79%), average nucleotide identity (ANI; 76.06%), and average amino acid identity (AAI; 78.89%). Its digital DNA-DNA hybridization (dDDH) result is 20.3%. The genome of strain JX-1^T, with a size of 2.78 Mb and 46.12 mol% G + C content, lacks genes for denitrification and dissimilatory nitrate reduction to ammonium (DNRA), but contains genes for ectoine synthesis as a secondary metabolite. The results of this polyphasic study allow genotypic and phenotypic differentiation of the analysed strain from the closest related species and confirm that the strain represents a novel species within the genus <i>Denitrificimonas</i>, for which the name <i>Denitrificimonas halotolerans</i> sp. nov. is proposed with JX-1^T (= MCCC 1K08958^T = KCTC 8395^T) as the type strain.</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141441035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: Genome-based classification of genera Halosegnis and Salella, and description of four novel halophilic archaea isolated from a tidal flat","authors":"Yao Hu,&nbsp;Xue Ma,&nbsp;Shun Tan,&nbsp;Xin-Xin Li,&nbsp;Mu Cheng,&nbsp;Jing Hou,&nbsp;Heng-Lin Cui","doi":"10.1007/s10482-024-01983-9","DOIUrl":"10.1007/s10482-024-01983-9","url":null,"abstract":"","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141332433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isoptericola haloaureus sp. nov., a dimorphic actinobacterium isolated from mangrove sediments of southeast India, implicating biosaline agricultural significance through nitrogen fixation and salt tolerance genes","authors":"Munisamy Prathaban,&nbsp;Ragothaman Prathiviraj,&nbsp;Mythili Ravichandran,&nbsp;Sharmila Devi Natarajan,&nbsp;Murugesan Sobanaa,&nbsp;S. Hari Krishna Kumar,&nbsp;Varadharaju Chandrasekar,&nbsp;Joseph Selvin","doi":"10.1007/s10482-024-01985-7","DOIUrl":"10.1007/s10482-024-01985-7","url":null,"abstract":"<div><p>Strain MP-1014^T, an obligate halophilic actinobacterium, was isolated from the mangrove soil of Thandavarayancholanganpettai, Tamil Nadu, India. A polyphasic approach was utilized to explore its phylogenetic position completely. The isolate was Gram-positive, filamentous, non-motile, and coccoid in older cultures. Ideal growth conditions were seen at 30 °C and pH 7.0, with 5% NaCl (W/V), and the DNA G + C content was 73.3%. The phylogenic analysis of this strain based upon 16S rRNA gene sequence revealed 97–99.8% similarity to the recognized species of the genus <i>Isoptericola.</i> Strain MP-1014^T exhibits the highest similarity to <i>I. sediminis</i> JC619^T (99.7%), <i>I. chiayiensis</i> KCTC19740^T (98.9%), and subsequently to <i>I. halotolerans</i> KCTC19646^T (98.6%), when compared with other members within the <i>Isoptericola</i> genus (&lt; 98%). ANI scores of strain MP-1014^T are 86.4%, 84.2%, and 81.5% and dDDH values are 59.7%, 53.6%, and 34.8% with <i>I. sediminis</i> JC619^T, <i>I. chiayiensis</i> KCTC19740^T and <i>I. halotolerans</i> KCTC19646^T respectively. The major polar lipids of the strain MP-1014^T were phosphatidylinositol, phosphatidylglycerol, diphosphotidylglycerol, two unknown phospholipids, and glycolipids. The predominant respiratory menaquinones were MK₉ (H₄) and MK₉ (H₂). The major fatty acids were anteiso-C_15:0, anteiso-C_17:0, iso-C_14:0, C_15:0, and C_16:0. Also, initial genome analysis of the organism suggests it as a biostimulant for enhancing agriculture in saline environments. Based on phenotypic and genetic distinctiveness, the strain MP-1014 ^T represents the novel species of the genus <i>Isoptericola</i> assigned <i>Isoptericola haloaureus</i> sp. nov., is addressed by the strain MP-1014 ^T, given its phenotypic, phylogenetic, and hereditary uniqueness. The type strain is MP-1014^T [(NCBI = OP672482.1 = GCA_036689775.1) ATCC = BAA 2646^T; DSMZ = 29325^T; MTCC = 13246^T].</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141301989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alkalimonas mucilaginosa sp. nov. and Alkalimonas cellulosilytica sp. nov. isolated from alkaline Lonar lake, India","authors":"Sonia Thite,&nbsp;Devika Godbole,&nbsp;Mahima Debnath,&nbsp;Agrima Bhatt,&nbsp;Amit Yadav,&nbsp;Tushar Lodha,&nbsp;Neetha Joseph,&nbsp;Kiran Kirdat,&nbsp;Dibyajyoti Boruah,&nbsp;Roohani Sharma,&nbsp;Amaraja Joshi","doi":"10.1007/s10482-024-01986-6","DOIUrl":"10.1007/s10482-024-01986-6","url":null,"abstract":"<div><p>Two alkaliphilic, Gram‐stain-negative bacterial strains (MEB004^T and MEB108^T) were isolated from water samples collected from Lonar lake, India. The phylogenetic analysis of their 16S rRNA gene sequences showed the highest similarity to <i>A. delamerensis</i> DSM 18314^T (98.4%), followed by <i>A. amylolytica</i> DSM 18337^T and <i>A. collagenimarina</i> JCM 14267^T (97.9%). The genome sizes of strains MEB004^T and MEB108^T were determined to be 3,858,702 and 4,029,814 bp, respectively, with genomic DNA G + C contents of 51.4 and 51.9%. Average Nucleotide Identity, DNA–DNA Hybridization and Amino Acid Identity values between strains (MEB004^T and MEB108^T) and <i>A. amylolytica</i> DSM 18337^T were (82.3 and 85.5), (25.0 and 29.2) and (86.7 and 90.2%). Both novel strains produced industrially important enzymes, such as amylase, lipase, cellulase, caseinase, and chitinase at pH 10 evidenced by the genomic presence of carbohydrate-active enzymes encoding genes. Genomic analyses further identified pH tolerance genes, affirming their adaptation to alkaline Lonar Lake. Dominant fatty acids were Summed feature 8 (C_18:1 <i>ω</i>7<i>c</i> and/or C_18:1 <i>ω</i>6<i>c</i>), C_16:0, Summed feature 3, Sum In Feature 2 and C_12:0 3OH. The prevalent polar lipids included phosphatidyl ethanolamine, phosphatidyl glycerol, and diphosphatidyl glycerol. The major respiratory quinone was ubiquinone-8. Based on the polyphasic data, we propose the classification of strains MEB004^T and MEB108^T as novel species within the genus <i>Alkalimonas</i> assigning the names <i>Alkalimonas mucilaginosa</i> sp. nov. and <i>Alkalimonas cellulosilytica</i> sp. nov., respectively. The type strains are MEB004^T (= MCC 5208^T = JCM 35954^T = NCIMB 15460^T) and MEB108^T (= MCC 5330^T = JCM 35955^T = NCIMB 15461^T).</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141293894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Roseateles caseinilyticus sp. nov. and Roseateles cellulosilyticus sp. nov., isolated from rice paddy field soil","authors":"Yoonseop So,&nbsp;Geeta Chhetri,&nbsp;Inhyup Kim,&nbsp;Sunho Park,&nbsp;Yonghee Jung,&nbsp;Taegun Seo","doi":"10.1007/s10482-024-01988-4","DOIUrl":"10.1007/s10482-024-01988-4","url":null,"abstract":"<div><p>Two novel Gram-stain-negative strains designated P7^T and P8^T, were isolated from the soil of a paddy field in Goyang, Republic of Korea, and identified as new species within the genus <i>Roseateles</i> through a polyphasic taxonomic approach. These aerobic, rod-shaped, non-sporulating strains demonstrated optimal growth at 30 °C, pH 7, and in the absence of NaCl (0% w/v). Phylogenetic analysis based on 16S rRNA gene sequences indicated close relationships with <i>Roseateles saccharophilus</i> DSM654^T (98.7%) and <i>Roseateles puraquae</i> CCUG 52769^T (98.96%), respectively. The average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values between the isolates with the most closely related strains with publicly available whole genomes were 82.0–85.5% and 25.0–30.2%, respectively. The predominant fatty acids identified were C_16:0 and summed feature 3 (composed of C_16:1 ω6c and/or C_16:1 <i>ω</i>7c), with minor amounts of C_12:0, C_10:0 3–OH and summed feature 8 (composed of C_18:1 <i>ω</i>7c and/or C_18:1 <i>ω</i>6c; 26.4%). Ubiquinone 8 was the main quinone, and the polar lipid profile included phosphatidylethanolamine, phosphatidylglycerol, two unidentified phosphoaminolipids, one unidentified phosphoglycolipid, three unidentified phospholipids, and one unidentified aminolipid. The draft genome sequences revealed genomic DNA G + C contents of 70.1% for P7^T and 68.2% for P8^T. Comprehensive physiological, biochemical, and 16S rRNA sequence analyses confirm these isolates as novel species of the genus <i>Roseateles</i>, proposed to be named <i>Roseateles caseinilyticus</i> sp. nov for strain P7^T (= KACC 22504^T = TBRC 15694^T) and <i>Roseateles cellulosilyticus</i> sp. nov. for strain P8^T (= KACC 22505^T = TBRC 15695^T).</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141238780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insights into the genomic traits of Yersinia frederiksenii, Yersinia intermedia and Yersinia kristensenii isolated from diverse sources in Brazil","authors":"Felipe Pinheiro Vilela,&nbsp;Priscilla Fernanda Martins Imori,&nbsp;Marc William Allard,&nbsp;Juliana Pfrimer Falcão","doi":"10.1007/s10482-024-01984-8","DOIUrl":"10.1007/s10482-024-01984-8","url":null,"abstract":"<div><p><i>Yersinia</i> is an important genus comprising foodborne, zoonotic and pathogenic bacteria. On the other hand, species of the so-called group <i>Yersinia enterocolitica</i>-like are understudied and mostly characterized as non-pathogenic, despite of some reports of human infections. The present study aimed to provide genomic insights of <i>Yersinia frederiksenii</i> (YF), <i>Yersinia intermedia</i> (YI) and <i>Yersinia kristensenii</i> (YK) isolated worldwide. A total of 22 YF, 20 YI and 14 YK genomes were searched for antimicrobial resistance genes, plasmids, prophages, and virulence factors. Their phylogenomic relatedness was analyzed by Gegenees and core-genome multi-locus sequence typing. Beta-lactam resistance gene <i>bla</i>_TEM-116 and five plasmids replicons (pYE854, ColRNAI, ColE10, Col(pHAD28) and IncN3) were detected in less than five genomes. A total of 59 prophages, 106 virulence markers of the <i>Yersinia</i> genus, associated to adherence, antiphagocytosis, exoenzymes, invasion, iron uptake, proteases, secretion systems and the O-antigen, and virulence factors associated to other 20 bacterial genera were detected. Phylogenomic analysis revealed high inter-species distinction and four highly diverse YF clusters. In conclusion, the results obtained through the analyses of YF, YI and YK genomes suggest the virulence potential of these strains due to the broad diversity and high frequency of prophages and virulence factors found. Phylogenetic analyses were able to correctly distinguish these closely related species and show the presence of different genetic subgroups. These data contributed for a better understanding of YF, YI and YK virulence-associated features and global genetic diversity, and reinforced the need for better characterization of these <i>Y. enterocolitica</i>-like species considered non-pathogenic.</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141201160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation, identification, and characterization of thermophilic lactic acid bacteria isolated from whey of Kars Kashar cheeses","authors":"Şehriban Oğuz,&nbsp;Seval Andiç","doi":"10.1007/s10482-024-01982-w","DOIUrl":"10.1007/s10482-024-01982-w","url":null,"abstract":"<div><p>Kars Kashar cheese is an artisanal pasta-filata type cheese and geographically marked in Eastern Anatolia of Turkey. The aims of this research were to determine for the first time thermophilic lactic acid bacteria (LAB) of Kars Kashar cheese and characterize the technological properties of obtained isolates. In our research, a number of 15 samples of whey were collected from the different villages in Kars. These samples were incubated at 45 °C and used as the source material for isolating thermophilic LAB. A total of 250 colonies were isolated from thermophilic whey, and 217 of them were determined to be presumptive LAB based on their Gram staining and catalase test. A total of 170 isolates were characterized by their phenotypic properties and identified using the MALDI-TOF mass spectrometry method. Phenotypic identification of isolates displayed that <i>Enterococcus</i> and <i>Lactobacillus</i> were the predominant microbiota. According to MALDI-TOF MS identification, 89 isolates were identified as <i>Enterococcus</i> (52.35%), 57 isolates as <i>Lactobacillus</i> (33.53%), 23 isolates as <i>Streptococcus</i> (13.53%), and one isolate as <i>Lactococcus</i> (0.59%). All thermophilic LAB isolates were successfully identified to the species level and it has been observed that MALDI-TOF MS can be successfully used for the identification of selected LAB. The acidification and proteolytic activities of the isolated thermophilic LAB were examined, and the isolates designated for use as starter cultures were also genotypically defined.</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141176854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Whole-genome sequencing of Pseudoalteromonas piscicida 2515 revealed its antibacterial potency against Vibrio anguillarum: a preliminary invitro study","authors":"Fenglin Wang,&nbsp;Abdallah Ghonimy,&nbsp;Xiuhua Wang","doi":"10.1007/s10482-024-01974-w","DOIUrl":"10.1007/s10482-024-01974-w","url":null,"abstract":"<div><p><i>Pseudoalteromonas piscicida</i> 2515, isolated from <i>Litopenaeus vannamei</i> culture water, is a potential marine probiotic with broad anti-Vibrio properties. However, genomic information on <i>P. piscicida</i> 2515 is scarce. In this study, the general genomic characteristics and probiotic properties of the <i>P. piscicida</i> 2515 strain were analysed. In addition, we determined the antibacterial mechanism of this bacterial strain by scanning electron microscopy (SEM). The results indicated that the whole-genome sequence of <i>P. piscicida</i> 2515 contained one chromosome and one plasmid, including a total length of 5,541,406 bp with a G + C content of 43.24%, and 4679 protein-coding genes were predicted. Various adhesion-related genes, amino acid and vitamin metabolism and biosynthesis genes, and stress-responsive genes were found with genome mining tools. The presence of genes encoding chitin, bromocyclic peptides, lantibiotics, and sactipeptides showed the strong antibacterial activity of the <i>P. piscicida</i> 2515 strain. Moreover, in coculture with <i>Vibrio anguillarum</i>, <i>P. piscicida</i> 2515 displayed vesicle/pilus-like structures located on its surface that possibly participated in its bactericidal activity, representing an antibacterial mechanism. Additionally, 16 haemolytic genes and 3 antibiotic resistance genes, including tetracycline, fluoroquinolone, and carbapenem were annotated, but virulence genes encoding enterotoxin FM (entFM), cereulide (ces), and cytotoxin K were not detected. Further tests should be conducted to confirm the safety characteristics of <i>P. piscicida</i> 2515, including long-term toxicology tests, ecotoxicological assessment, and antibiotic resistance transfer risk assessment. Our results here revealed a new understanding of the probiotic properties and antibacterial mechanism of <i>P. piscicida</i> 2515, in addition to theoretical information for its application in aquaculture.</p></div>","PeriodicalId":50746,"journal":{"name":"Antonie Van Leeuwenhoek International Journal of General and Molecular Microbiology","volume":"117 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141161517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}