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          Institute: MPI für marine Mikrobiologie     Collection: Abteilung Mikrobiologie     Display Documents

ID: 13930.0, MPI für marine Mikrobiologie / Abteilung Mikrobiologie
Physiological response to temperature changes of the marine, sulfate-reducing bacterium Desulfobacterium autotrophicum
Authors:Rabus, R.; Brüchert, V.; Amann, J.; Könneke, M.
Date of Publication (YYYY-MM-DD):2002-12
Title of Journal:FEMS Microbiology Ecology
Journal Abbrev.:FEMS Microbiol. Ecol.
Issue / Number:3
Start Page:409
End Page:417
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The physiological response of bacteria to temperature is critical for the regulation of biogeochemical processes on daily, seasonal, and inter-annual time scales. We investigated the temperature response of the marine sulfate-reducing bacterium Desulfobacterium autotrophicum strain HRM2. Growth experiments in a temperature gradient block demonstrated that D. autotrophicum is psychrotolerant and grows between 0 and 31degreesC. The normal range of temperature for growth is between 4 and 29degreesC. The physiological response to temperature changes was studied with three sets of cells that were acclimated at 4, 10, and 28degreesC, respectively. Sulfate reduction rates were determined in the temperature gradient block with short-term incubations to minimize growth. The rates were similar at the 4 and 10degreesC acclimation temperature, and exhibited an enhanced response at 28degreesC. At every acclimation temperature, sulfate reduction rates increased 20- fold from -1.7 to 41degreesC. The relative proportion of cellular unsaturated fatty acids (e.g. cis16:1) and short-chain fatty acids increased when cells were grown at 4degreesC compared to 28degreesC. The proteome of D. autotrophicum strain HRM2 was studied by two-dimensional gel electrophoresis with soluble extracts of cells grown at the three respective acclimation temperatures. Protein patterns were similar with the exception of two proteins showing 5-10-fold lower abundance in the 4degreesC culture compared to the 28degreesC culture. In general, D. autotrophicum strain HRM2 responded to low temperatures by reduced metabolic activity rather than by pronounced de novo synthesis of specifically adapted enzymes. Such a strategy agrees well with in situ activities measured in field studies and may reflect a common physiological principle of psychrotolerant marine sulfate-reducing bacteria. (C) 2002 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.
Free Keywords:sulfate-reducing bacterium; temperature; sulfate reduction rate; cellular fatty acid; two-dimensional gel electrophoresis; Desulfobacterium autotrophicum
Comment of the Author/Creator:Date: 2002, DEC
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für marine Mikrobiologie
External Affiliations:Max Planck Inst Marine Mikrobiol, Celsiusstr 1, D-28359 Bremen,; Germany; Max Planck Inst Marine Mikrobiol, D-28359 Bremen, Germany
Identifiers:ISI:000179545100009 [ID No:1]
ISSN:0168-6496 [ID No:2]
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