Data/hora: 07/06/2024 05:37:14

Provedor de dados: | 52
País: | Brazil
Título: | Cloning and characterization of the iron uptake gene iutA from avian Escherichia coli
Autores: | Tokano,Dorismey Vieira; Kawaichi,Marisa Emiko; Venâncio,Emerson José; Vidotto,Marilda Carlos.
Data: | 2008-06-01
Ano: | 2008
Palavras-chave: | Avian Escherichia coli; Iron uptake; Aerobactin receptor; Virulence factor; IutA gene.
Resumo: | The aim of this work was to isolate, clone and characterize the iron uptake gene iutA from avian pathogenic E. coli (APEC). The iutA gene was isolated from the strain APEC 9, serotype O2:H9, which was cloned in the expression vector pET101/D-TOPO. The gene of 2.2 Kb was sequenced (AY602767, which showed high similarity to the iutA gene from three plasmids, two from APEC, pAPEC-02-ColV (AY545598.4) and pTJ100 (AY553855.1), and one from a human invasive E. coli strain, the pColV K30. The recombinant protein IutA was over expressed in E. coli BL21(DE-3) and was solubilized with urea and purified by Ni-NTA column. This method produced a relatively high yield of r-IutA of approximately 74kDa, which was used to produce the antibody anti-IutA. This anti-IutA reacted with the protein r-IutA and native IutA of APEC 9, as demonstrated by Western blot, showing that the r-IutA conserved epitopes and its antigenicity was preserved. The anti-IutA IgY was able to inhibit the IutA biological activity, inhibiting the sensitivity to cloacin DF13 of APEC9. However, it did not inhibit the growth of APEC9 in M9 and did not protect the chickens inoculated with the APEC, suggesting that the APEC possessed another iron acquisition mechanism distinct of aerobactin.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300006
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132008000300006
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.51 n.3 2008
Fonte: | info:eu-repo/semantics/openAccess