Helicobacter pylori Urease Activity is Influenced by Ferric Uptake Regulator
Yonsei Medical Journal
;
: 39-44, 2010.
Artigo
em Inglês
| WPRIM
| ID: wpr-39512
ABSTRACT
PURPOSE:
The role of the Ferric Uptake Regulator (FUR) in the acid resistance of Helicobacter pylori (H. pylori) has been thought to be independent of urease. However, we demonstrated in this study that Fur influences urease activity. MATERIALS ANDMETHODS:
A fur knockout mutant of H. pylori was constructed by replacing the Fur gene with a kanamycin resistant marker gene. The wild-type H. pylori and fur mutant were compared for survival. The integrity of the inner membrane of the bacteria was evaluated by confocal microscopy using membrane-permeant and -impermeant fluorescent DNA probes. Urease activity of intact H. pylori was measured between pH 3 and 8. Real time PCR of both strains was performed for urease genes including ureI, ureE, ureF, ureG, and ureH.RESULTS:
The fur deletion affected the survival of H. pylori at pH 4. The urease activity curve of the intact fur mutant showed the same shape as the wild-type but was 3-fold lower than the wild-type at a pH of less than 5. Real time PCR revealed that the expression of all genes was consistently down-regulated in the fur mutant.CONCLUSION:
The results of this study showed that fur appears to be involved in acid resistant H. pylori urease activity.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Proteínas Repressoras
/
Proteínas de Bactérias
/
Urease
/
Helicobacter pylori
/
Microscopia Confocal
/
Concentração de Íons de Hidrogênio
/
Modelos Biológicos
/
Mutação
Tipo de estudo:
Estudo prognóstico
Idioma:
Inglês
Revista:
Yonsei Medical Journal
Ano de publicação:
2010
Tipo de documento:
Artigo
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