Type Iv Fimbriae
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Fímbrias Pil em Escherichia coli enteropatogênica atípica: Caracterização e investigação do papel de PilS e PilV na adesão bacteriana. / Type IV pilus in atypical enteropathogenic Escherichia coli: characterization and investigation of PilS and PilV in bacterial adhesion role.
Fímbrias do tipo IV estão associadas a diversos fenótipos em bactérias gram-negativas, e o presente estudo consistiu na caracterização da fímbria Pil e investigação de seu papel na adesão bacteriana de isolados de EPEC atípica. Por PCR e RT-PCR foram investigadas a presença e a funcionalidade do operon Pil e os resultados demonstraram que este es
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/06/2012
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2. The Major Structural Subunits of Dr and F1845 Fimbriae Are Adhesins
Fimbrial adhesins mediate the attachment of pathogenic Escherichia coli to various host tissues leading to the development of disease. The Dr hemagglutinin and F1845 fimbriae belong to the Dr family of adhesins, which is associated with urinary tract infections and diarrheal disease. These adhesins bind to the Dra blood-group antigen present on decay-acceler
American Society for Microbiology.
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3. The Type IV Fimbrial Subunit Gene (fimA) of Dichelobacter nodosus Is Essential for Virulence, Protease Secretion, and Natural Competence
Dichelobacter nodosus is the essential causative agent of footrot in sheep. The major D. nodosus-encoded virulence factors that have been implicated in the disease are type IV fimbriae and extracellular proteases. To examine the role of the fimbriae in virulence, allelic exchange was used to insertionally inactivate the fimA gene, which encodes the fimbrial
American Society for Microbiology.
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4. Sialyloligosaccharide chains of laminin as an extracellular matrix target for S fimbriae of Escherichia coli.
S fimbriae purified from recombinant Escherichia coli HB101(pANN801-13) bound strongly to extracellular matrices of cultured endothelial and epithelial cells; only poor binding was seen with the fimbriae purified from the sfaS mutant strain HB101(pANN801-1321). E. coli HB101(pANN801-13) adhered strongly to laminin immobilized on glass; no adhesion was seen t
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5. Conjugative Plasmid Transfer and Adhesion Dynamics in an Escherichia coli Biofilm▿ †
A conjugative plasmid from the catheter-associated urinary tract infection strain Escherichia coli MS2027 was sequenced and annotated. This 42,644-bp plasmid, designated pMAS2027, contains 58 putative genes and is most closely related to plasmids belonging to incompatibility group X (IncX1). Plasmid pMAS2027 encodes two important virulence factors: type 3 fi
American Society for Microbiology (ASM).
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6. Distribution and Molecular Characterization of Porphyromonas gingivalis Carrying a New Type of fimA Gene
Fimbriae of Porphyromonas gingivalis are filamentous appendages on the cell surface and are thought to be one of the virulence factors. The fimA gene encoding the subunit protein of fimbriae, fimbrillin (FimA), was classified into four typeable variants (types I to IV). We previously examined the distribution of P. gingivalis in terms of fimA genotypes in pe
American Society for Microbiology.
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7. Yersinia pseudotuberculosis Harbors a Type IV Pilus Gene Cluster That Contributes to Pathogenicity
Fimbriae have been shown to play an essential role in the adhesion of pathogenic gram-negative bacteria to host cells. In the enteroinvasive bacterium Yersinia pseudotuberculosis, we characterized a previously unknown 11-kb chromosomal locus involved in the synthesis of type IV pili. The locus consists of 11 open reading frames forming a polycistronic unit a
American Society for Microbiology.
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8. Enhancement of mannose-mediated stimulation of human granulocytes by type 1 fimbriae aggregated with antibodies on Escherichia coli surfaces.
In the present study, we assayed protein iodination in human granulocytes after interaction of the cells with mannose-specific (MS) type 1 fimbriated (MS+) and nonfimbriated (MS-) phenotypes of Escherichia coli pretreated with various amounts of anti-E. coli and antifimbrial antibodies. The MS+ phenotype stimulated protein iodination in granulocytes and poss
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9. Interaction of Dr Adhesin with Collagen Type IV Is a Critical Step in Escherichia coli Renal Persistence
The pathogenic mechanism of recurrent or chronic urinary tract infection is poorly understood. Escherichia coli cells bearing Dr fimbriae display unique tropism to the basement membrane (BM)-renal interstitium that enables the bacteria to cause chronic pyelonephritis in experimental mice. The renal receptors for Dr-fimbriated E. coli are type IV collagen and
American Society for Microbiology.
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10. Development and Application of Pathovar-Specific Monoclonal Antibodies That Recognize the Lipopolysaccharide O Antigen and the Type IV Fimbriae of Xanthomonas hyacinthi
The objective of this study was to develop a specific immunological diagnostic assay for yellow disease in hyacinths, using monoclonal antibodies (MAbs). Mice were immunized with a crude cell wall preparation (shear fraction) from Xanthomonas hyacinthi and with purified type IV fimbriae. Hybridomas were screened for a positive reaction with X. hyacinthi cell
American Society for Microbiology.
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11. Fimbriation of Pseudomonas cepacia.
Fimbriae (pili) on the surface of bacteria have been suggested to facilitate adherence to mucosal epithelial surfaces. Three Pseudomonas cepacia cystic fibrosis isolates were screened for their ability to agglutinate erythrocytes (HA), a characteristic of some fimbrial types. One strain, designated PC103, was HA+, while another, PC109, was HA-. A fimbriated
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12. Initiation of Biofilm Formation by Pseudomonas aeruginosa 57RP Correlates with Emergence of Hyperpiliated and Highly Adherent Phenotypic Variants Deficient in Swimming, Swarming, and Twitching Motilities
Pseudomonas aeruginosa is a ubiquitous environmental bacterium capable of forming biofilms on surfaces as a survival strategy. It exhibits a large variety of competition/virulence factors, such as three types of motilities: flagellum-mediated swimming, flagellum-mediated swarming, and type IV pilus-mediated twitching. A strategy frequently used by bacteria t
American Society for Microbiology.