Functioning of the mercury resistance operon at extremely high Hg(II) loads in a chemostat: A proteome analysis.

Functioning of the mercury resistance operon at extremely high Hg(II) loads in a chemostat: A proteome analysis. Research Abstract Details 

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Functioning of the mercury resistance operon at extremely high Hg(II) loads in a chemostat: A proteome analysis. Abstract Text:

Johannes ,Wei Wang,Wolf-Dieter Deckwer,Irene ,Johannes ,Wei Wang,Wolf-Dieter Deckwer,Irene ,Johannes ,Wei Wang,Wolf-Dieter Deckwer,Irene ,

The transformation of extremely high concentrations of ionic mercury (up to 500mgL(-1)) was investigated in a chemostat for two mercury-resistant Pseudomonas putida strains, the sediment isolate Spi3 carrying a regulated mercury resistance (mer) operon, and the genetically engineered strain KT2442Colon, two colonsmer73 expressing the mer operon constitutively. Both strains reduced Hg(II) with an efficiency of 99.9% even at the maximum load, but the concentration of particle bound mercury in the chemostat increased strongly. A proteome analysis using two-dimensional gel electrophoresis and mass spectrometry (2-DE/MS) showed constant expression of the MerA and MerB proteins in KT2442Colon, two colonsmer73 as expected, while in Spi3 expression of both proteins was strongly dependent on the Hg(II) concentration. The total cellular proteome of the two strains showed very little changes at high Hg(II) load. However, certain cellular responses of the two strains were identified, especially in membrane-related transport proteins. In Spi3, an up to 45-fold strong induction of a cation efflux transporter was observed, accompanied by a drastic downregulation (106-fold) of an outer membrane porin. In such a way, the cell complemented the highly specific mercury resistance mechanism with a general detoxification response. No indication of a higher demand on energy metabolism could be found for both strains.

Functioning of the mercury resistance operon at extremely high Hg(II) loads in a chemostat: A proteome analysis. Publishing Authors By Initials

J ,W Wang,WD Deckwer,I ,J ,W Wang,WD Deckwer,I ,J ,W Wang,WD Deckwer,I ,

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Functioning of the mercury resistance operon at extremely high Hg(II) loads in a chemostat: A proteome analysis. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biotechnology

VOLUME: 132

Page Numbers: 469-80

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ISSN: 0168-1656

DAY: 14

MONTH: 08

YEAR: 2007

Functioning of the mercury resistance operon at extremely high Hg(II) loads in a chemostat: A proteome analysis. Information

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LANGUAGE: eng

NlmUniqueID: 8411927

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Grant and Affiliation Information for Functioning of the mercury resistance operon at extremely high Hg(II) loads in a chemostat: A proteome analysis.

AFFILIATION: Technical University Braunschweig/HZI-Helmholtz Center for Infection Research, Biochemical Engineering, Inhoffenstrasse 7, D-38124 Braunschweig, Germany.

Country: Netherlands

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MEDLINETA: J Biotechnol

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