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- W2022993831 abstract "Two-dimensional electrophoresis (2-DE) was used to analyze the pleiotropic effects of a deficiency in DsbA, a periplasmic disulfide-bond oxidoreductase, in Salmonella typhi. With this aim, the dsbA gene was cloned and assayed for activity in a dsbA-null mutant of Escherichia coli. A dsbA/chloramphenicol acetylase construct was then used to disrupt the wild-type gene of S. typhi. The resultant dsbA-null mutant of S. typhi, like the E. coli mutant, exhibited a lack of flagellation and of glucose-1-phosphatase activity. Periplasmic extracts from the parental and mutant strains were analyzed by 2-DE using standard denaturing and nondenaturing conditions. Differences in protein expression were more marked in nondenaturing conditions. Ninety-nine protein spots were analyzed by peptide mass fingerprinting, and 65 spots were identified by searching a S. typhi database. Twenty-five spots were exclusively detected in the wild-type strain, 10 were found only in the mutant strain, and 21 were common to both strains. We observed a lack of DsbA, glucose-1-phosphatase and flagellin in the dsbA-null mutant, which explains two of the observed phenotypes. The AI-2 autoinducer-producing protein LuxS, which is involved in quorum-sensing signalling was also absent." @default.
- W2022993831 created "2016-06-24" @default.
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- W2022993831 date "2004-01-29" @default.
- W2022993831 modified "2023-09-30" @default.
- W2022993831 title "A proteomic approach to studySalmonella typhi periplasmic proteins altered by a lack of the DsbA thiol: Disulfide isomerase" @default.
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- W2022993831 doi "https://doi.org/10.1002/pmic.200300554" @default.
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