Identificação de novos antigenos flagelares de Escherichia coli de origem humana / Identification of new Escherichia coli flagellar antigen from human origin

AUTOR(ES)

Monique Ribeiro Tiba

DATA DE PUBLICAÇÃO

2009

RESUMO

Escherichia coli has been isolated frequently, showing flagellar antigens that are not recognized by any of the antisera, provided by the most important reference center of E. coli, The International Escherichia and Klebsiella Centre (WHO) of the Statens Serum Institute, Copenhagen, Denmark. Are currently recognized 53 H antigens and in the last 29 years, no change occurred in the list of flagellar antigens associated with Escherichia coli. The objectives of this study were to identify the flagellar antigens of E. coli that do not express non-typeable H antigens and presenting the virulence factors associated with different diseases. This identification was performed initially by gene amplification of the fliC, (flagellin protein) by the polymerase chain reaction (PCR) in all 53 standards E. coli strains for the H antigens and 20 non-typeable H-antigens E. coli strains, being then, the amplicons were digested by restriction enzymes. Anti-sera were produced in rabbits, those strains that showed different restriction profiles of these patterns observed for the nontypeable H antigens E. coli strains. Agglutination testes were carried out against the 53 antigens standards, against the homologous antigen and H antigens of the non-typeable strains. DNA sequences were compared to different fliC genes stored in the database of the National Center for Biotecnology Information (NCBI) through the BLAST, and ClustalW program was used to align the sequences. The results showed that although these strains have homology with a standard H-antigen, they do not have the same nucleotide sequence and did not phenotypically reacted with the antiserum expected. The data obtained showed that thirteen strains had a different H antigen those already described in the literature when used the techniques of PCR-RFLP and/or serology

ASSUNTO(S)

sorologia flagella (microbiology) flagelos (microbiologia) - antigenos escherichia coli sequenciamento de dna dna sequencing serology

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