Isolamento e caracterização de cepas de Saccharomyces cerevisiae de interesse em produção de vinho

Despite the availability of several Saccharomyces cerevisiae commercial strains intended for wine production, strains isolated from winery regions are usually more adapted to their own climatic conditions, grapes and also partially responsible for particular characteristics that frequently identify specific wines and regions. Thus the microbiota of an important winery region (Colombo) was studied in order to isolate and characterize S. cerevisiae strains that could be used on wine production. From 61 yeasts isolated, 14 were identified as S. cerevisiae. Some of them showed fermentative characteristics even better than commercial strains indicating that they could be applied on wine production in order to increase the quality and assure the particular wine characteristics of that region

Genome comparison between clinical and environmental strains of Herbaspirillum seropedicae reveals a potential new emerging bacterium adapted to human hosts

Abstract Background Herbaspirillum seropedicae is an environmental β-proteobacterium that is capable of promoting the growth of economically relevant plants through biological nitrogen fixation and phytohormone production. However, strains of H. seropedicae have been isolated from immunocompromised patients and associated with human infections and deaths. In this work, we sequenced the genomes of two clinical strains of H. seropedicae, AU14040 and AU13965, and compared them with the genomes of strains described as having an environmental origin. Results Both genomes were closed, indicating a single circular chromosome; however, strain AU13965 also carried a plasmid of 42,977 bp, the first described in the genus Herbaspirillum. Genome comparison revealed that the clinical strains lost the gene sets related to biological nitrogen fixation (nif) and the type 3 secretion system (T3SS), which has been described to be essential for interactions with plants. Comparison of the pan-genomes of clinical and environmental strains revealed different sets of accessorial genes. However, antimicrobial resistance genes were found in the same proportion in all analyzed genomes. The clinical strains also acquired new genes and genomic islands that may be related to host interactions. Among the acquired islands was a cluster of genes related to lipopolysaccharide (LPS) biosynthesis. Although highly conserved in environmental strains, the LPS biosynthesis genes in the two clinical strains presented unique and non-orthologous genes within the genus Herbaspirillum. Furthermore, the AU14040 strain cluster contained the neuABC genes, which are responsible for sialic acid (Neu5Ac) biosynthesis, indicating that this bacterium could add it to its lipopolysaccharide. The Neu5Ac-linked LPS could increase the bacterial resilience in the host aiding in the evasion of the immune system. Conclusions Our findings suggest that the lifestyle transition from environment to opportunist led to the loss and acquisition of specific genes allowing adaptations to colonize and survive in new hosts. It is possible that these substitutions may be the starting point for interactions with new hosts.https://deepblue.lib.umich.edu/bitstream/2027.42/152201/1/12864_2019_Article_5982.pd

Virulence properties and antimicrobial susceptibility of Shiga toxin-producing Escherichia coli strains isolated from healthy cattle from Parana State, Brazil

The presence of Shiga toxin-producing Escherichia coli (STEC) strains in feces samples of cattle was determined using the cytotoxicity assay on Vero cells and a screening PCR system to detect stx genes. The STEC isolates were sero-typed, tested for antimicrobial Susceptibility, and analyzed for virulence genes using multiplex PCR. The verocytotoxin-producing E. coli - reverse passive latex agglutination (VTEC-RPLA) assay was also used to detect Shiga toxin production. The frequency of cattle shedding STEC was 36%. The isolates belonged to 33 different serotypes. of which O10:H42, O98:H41, and O159:H21 had not previously been associated with STEC. The most frequent serotypes were ONT:H7 (10%), O22:H8 (7%) O22:H16 (7%), and ONT:H21 (7%). Most of the strains (96%) were susceptible to all antimicrobial agents tested. Shiga toxin was detected by the VTEC-RPLA assay in most (89%) of the STEC strains. The frequency of virulence markers was as follows: stx(1), 10%; stx(2), 43%; stx(1), plus stx(2), 47%; ehxA, 44%; eae, 1%; and saa, 38%. Several strains belong to serotypes associated with human disease, and most of them carried a stx(2)-type gene, suggesting that they represent a risk to human health. The screening PCR assay showed fewer false-negative results for STEC than the Vero-cell assay and is suitable for laboratory routine.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Genome analysis of entomopathogenic Bacillus sp. ABP14 isolated from a lignocellulosic compost

Submitted by Manoel Barata ([email protected]) on 2019-09-19T18:15:07Z No. of bitstreams: 1 evz11.pdf: 214775 bytes, checksum: 20072285b177e35c45c22f5bd293bbca (MD5)Approved for entry into archive by Manoel Barata ([email protected]) on 2019-10-14T14:51:20Z (GMT) No. of bitstreams: 1 evz11.pdf: 214775 bytes, checksum: 20072285b177e35c45c22f5bd293bbca (MD5)Made available in DSpace on 2019-10-14T14:51:20Z (GMT). No. of bitstreams: 1 evz11.pdf: 214775 bytes, checksum: 20072285b177e35c45c22f5bd293bbca (MD5) Previous issue date: 2019Universidade Federal do Paraná. Departamento de Bioquímica e Biologia Molecular. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Bioquímica e Biologia Molecular. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Zoologia. Curitiba, PR, Brasil.Universidade Federal do Paraná. Setor de Educação Tecnológica e Profissional. Laboratório de Bioinformática. Curitiba, PR, Brasil.Fundação Oswaldo Cruz. Instituto Carlos Chagas. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Bioquímica e Biologia Molecular. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Bioquímica e Biologia Molecular. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Bioquímica e Biologia Molecular. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Análises Clínicas. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Biologia Celular. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Bioquímica e Biologia Molecular. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Zoologia. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Bioquímica e Biologia Molecular. Curitiba, PR, Brasil.Universidade Federal do Paraná. Departamento de Bioquímica e Biologia Molecular. Curitiba, PR, Brasil.We report the complete genome sequence of Bacillus sp. strain ABP14 isolated from lignocellulosic compost and selected by its ability in hydrolyzing carboxymethyl cellulose. This strain does not produce a Cry-like protein but showed an insecticidal activity against larvae of Anticarsia gemmatalis (Lepidoptera). Genome-based taxonomic analysis revealed that the ABP14 chromosome is genetically close to Bacillus thuringiensis serovar finitimus YBT020. ABP14 also carries one plasmid which showed no similarity with those from YBT020. Genome analysis of ABP14 identified unique genes related to cell surface structures, cell wall, metabolic competence, and virulence factors that may contribute for its survival and environmental adaptation, as well as its entomopathogenic activity

Morphological and molecular identification of filamentous fungi isolated from cosmetic powders

Seven fungi were isolated from 50 samples of cosmetic powders. Morphological analyses and ribosomal DNA Internal Transcribed Spacers sequencing were performed which allowed the discrimination of the isolated fungi as Aspergillus fumigatus, Penicillium sp., and Cladosporium sp. which could have, among their species, potentially pathogenic microorganisms