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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2012.tde-19092012-090153
Document
Author
Full name
Júlia Mitico Nára
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Piazza, Roxane Maria Fontes (President)
Amaral, Tania Aparecida Tardelli Gomes do
Faça, Vitor Marcel
Neves, Carla Taddei de Castro
Zingali, Russolina Benedeta
Title in Portuguese
Adesinas fimbriais em Escherichia coli enteropatogênica atípica: prevalência e proteômica.
Keywords in Portuguese
Escherichia coli
Espectrometria de massas
Genes
Genética bacteriana
Proteínas
Proteômica
Reação em cadeia por polimerase
Abstract in Portuguese
EPECa apresenta padrões de aderência localizado-like (LAL), agregativo (AA), difuso (DA), indeterminado ou são não aderentes (NA) em células epiteliais in vitro. Como esses fenótipos de aderência são também observados em outros patotipos de E. coli, o objetivo foi pesquisar nas EPECa a presença de genes de adesinas encontrados em outras E. coli patogênicas e analisar comparativamente por proteoma os extratos protéicos dos isolados BA320 (LAL), Ec292/84 (AA), 9100-83 (DA) e BA4013 (NA). Neste estudo, observou-se a presença de diferentes estruturas filamentosas ancoradas a superfície nos quatro isolados e a presença dos genes fimA, fimH, papA, ecpA, ldaH, pilS, daaC, sfpA, lpfAO113 e os variantes polimórficos (lpfA1 e lpfA2). Por proteômica foram identificadas as proteínas H-NS, OmpX, Usp, FucU, MglB e uma possível proteína filamentosa nos isolados de fenótipos de adesão LAL, AA e DA. Concluiu-se que, os genes das fímbrias tipo 1 e ECP são altamente prevalentes nas EPECa e as proteínas identificadas podem estar associadas ao processo de adesão das bactérias.
Title in English
Fimbrial adhesins in atypical enteropathogenic Escherichia coli: prevalence and proteomics.
Keywords in English
Escherichia coli
Bacterial Genetics
Genes
Mass spectrometry
Polymerase chain reaction
Proteins
Proteomics
Abstract in English
aEPEC is classified according to its adhesion in vitro pattern in localized-like (LAL), aggregative (AA), diffuse (DA), and indeterminate adherence patterns as well as nonadherent (NA) strain. Since some aEPEC display the adherence phenotype observed for other pathotypes of E. coli, the aim was to investigate, in aEPEC, the presence of adhesin genes present in other pathogenic E. coli and analyze, by comparative proteomic analyses, the protein extracts isolated from BA320 (LAL), Ec292/84 (AA), 9100-83 (DA) and BA4013 (NA). We observed the presence of different filamentous structures anchored to aEPEC surface and presence of fimA, fimH, papA, ecpA, ldaH, pilS, daaC, sfpA, lpfAO113 genes and polymorphic variants (lpfA1 and lpfA2). By proteomic analyses the proteins H-NS, OmpX, FucU, MglB were identified and a putative filamentous protein was found in aEPEC with the phenotypes LAL, AA and DA. We conclude that the genes encoding type 1 fimbriae and ECP pilus are highly prevalent in aEPEC, and the proteins identified can be associated to bacterial adhesion processes.
 
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Publishing Date
2012-10-23
 
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