Iga Protease
Mostrando 1-12 de 98 artigos, teses e dissertações.
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1. Estudo da variabilidade genética e dos fatores de virulência de isolados de Ureaplasma diversum. / Study of genetic variability and virulence factors of Ureaplasma diversum isolates.
The aim of the present study was the study of genetic variability and virulence factors of U. diversum clinical isolates. The strains were submitted to sequencing for 16S rRNA and urease genes. Moreover, the strains were analyzed to the virulence factors: capsule, phospholipase C, IgA protease and adhesion and invasion into Hep-2 cells. The sequencing of par
Publicado em: 2009
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2. Abordagem biotecnológica em Proteus mirabilis
O gênero Proteus é caracterizado pela rápida mobilidade, fenômeno denominado swarming. Quanto à homologia de seu DNA, apresenta apenas uma discreta relação com o da Escherichia coli. Freqüentemente relacionado com infecções urinárias, facilitadas pela sua capacidade em degradar uréia, tem sido encontrado colonizando cateteres e sondas vesicais, p
Publicado em: 2008
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3. ASPECTOS BIOQUÃMICOS, TOXICOLÃGICOS E ALERGÃNICOS DO LÃTEX DA PLANTA CALOTROPIS PROCERA (Ait.) R. Br.
O lÃtex da planta lactÃfera Calotropis procera (Ait.) R. Br. à um composto biologicamente ativo importante que apresenta propriedades relevantes como as atividades antiinflamatÃria e antidiarrÃica, embora jà tenha sido previamente mostrado que esse lÃtex produz efeitos tÃxicos considerÃveis em animais. Um outro fato à que nÃo à sabido, ainda, se
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/08/2006
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4. Biochemical, Toxicological and Allergenic Aspects of the Latex from the Plant Calotropis procera (Ait.) R. Br. / Aspectos bioquÃmicos, toxicolÃgicos e alergÃnicos do lÃtex da planta Calotropis procera (Ait.) R. BR.
O lÃtex da planta lactÃfera Calotropis procera (Ait.) R. Br. à um composto biologicamente ativo importante que apresenta propriedades relevantes como as atividades antiinflamatÃria e antidiarrÃica, embora jà tenha sido previamente mostrado que esse lÃtex produz efeitos tÃxicos considerÃveis em animais. Um outro fato à que nÃo à sabido, ainda, se
Publicado em: 2006
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5. ZapA, a possible virulence factor from Proteus mirabilis exhibits broad protease substrate specificity
The opportunistic bacterium Proteus mirabilis secretes a metalloprotease, ZapA, considered to be one of its virulence factors due to its IgA-degrading activity. However, the substrate specificity of this enzyme has not yet been fully characterized. In the present study we used fluorescent peptides derived from bioactive peptides and the oxidized ß-chain of
Brazilian Journal of Medical and Biological Research. Publicado em: 2001-11
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6. Evaluation of Immunoglobulin A1 (IgA1) Protease and IgA1 Protease-Inhibitory Activity in Human Female Genital Infection with Neisseria gonorrhoeae
Immunoglobulin A1 (IgA1) protease, an enzyme that selectively cleaves human IgA1, may be a virulence factor for pathogenic organisms such as Neisseria gonorrhoeae. Host protection from the effects of IgA1 protease includes antibody-mediated inhibition of IgA1 protease activity, and it is believed that the relative balance between IgA1 protease and inhibitory
American Society for Microbiology.
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7. IgA protease of Neisseria gonorrhoeae: isolation and characterization of the gene and its extracellular product.
Gonococcal virulence is thought to rely on multiple characteristics including the production of an extracellular protease specific for human IgA1. Using a sensitive filter assay we have isolated an Escherichia coli clone which harbours the gene of Neisseria gonorrhoeae MS11 IgA protease on a multicopy number plasmid. This clone secrets IgA protease activity
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8. Examination of Haemophilus pleuropneumoniae for immunoglobulin A protease activity.
Haemophilus pleuropneumoniae, the etiological agent of porcine contagious pneumonia, was examined for the ability to produce an immunoglobulin A (IgA) protease specific for porcine IgA. No IgA protease activity against either porcine or human IgA was detected. Furthermore, no sequence homology was found between H. pleuropneumoniae chromosomal DNA and the gen
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9. Quantitative screening of clinical isolates for immunoglobulin A protease production.
The production of immunoglobulin A (IgA) protease is a potentially useful marker in differentiating pathogenic from nonpathogenic species of clinical isolates; however, current quantitative assay methods are too tedious for routine application. A simple quantitative method was developed to screen clinical isolates for IgA protease production. This method is
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10. Cloning and sequencing of the immunoglobulin A1 protease gene (iga) of Haemophilus influenzae serotype b.
Secretion of immunoglobulin A1 (IgA1) proteases is a characteristic of Haemophilus influenzae and several other bacterial pathogens causing infectious diseases, including meningitis. Indirect evidence suggests that the proteases are important virulence factors. In this study, we cloned the iga gene encoding immunoglobulin A1 (IgA1) protease from H. influenza
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11. Survey of immunoglobulin A protease activity among selected species of Ureaplasma and Mycoplasma: specificity for host immunoglobulin A.
Because immunoglobulin A (IgA) is the predominant immunoglobulin at mucosal surfaces, IgA proteases produced by pathogenic bacteria are considered potential virulence factors for organisms that cause disease or gain entry at mucous membranes. To determine the role of IgA protease in the pathogenicity of mycoplasmal disease, a variety of human and animal myco
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12. Pioneer oral streptococci produce immunoglobulin A1 protease.
As part of a longitudinal study of the relationship between bacterial colonization and the secretory immune response, 367 isolates of pioneer viridans streptococci collected from 40 breast- and bottle-fed neonates within the first month postpartum were tested for the production of immunoglobulin A1 (IgA1) protease and glycosidases. Fifty percent of the strep