Dataset Information


Transcription profiling of wild type G. sulfurreducens DL1 strain and mutant DLCN16 (delta-rpoS::Km) using fumarate as an electron acceptor

ABSTRACT: Wild type G. sulfurreducens DL1 strain (see Caccavo, F., Jr., D. J. Lonergan, D. R. Lovley, M. Davis, J. F. Stolz, and M. J. McInerney. 1994. Geobacter sulfurreducens sp. nov., a hydrogen- and acetate-oxidizing dissimilatory metal-reducing microorganism. Appl Environ Microbiol 60:3752-9. see also Coppi, M. V., C. Leang, S. J. Sandler, and D. R. Lovley. 2001. Development of a genetic system for Geobacter sulfurreducens. Appl Environ Microbiol 67:3180-7.) and DLCN16 mutant (.rpoS::Km) (see Nuñez, C., L. Adams, S. Childers, and D. R. Lovley. 2004. The RpoS sigma factor in the dissimilatory Fe(III)-reducing bacterium Geobacter sulfurreducens. J Bacteriol 186:5543-6.) were grown under anaerobic conditions at 30 °C in continuous culture with a 200 ml working volume as previously described (see Esteve-Nunez, A., M. Rothermich, M. Sharma, and D. Lovley. 2005. Growth of Geobacter sulfurreducens under nutrient-limiting conditions in continuous culture. Environ Microbiol 7:641-8.). Cells were cultured at a growth rate of 0.05 h-1, steady-state cell growth was obtained after 5 volume refills and was confirmed by a constant cell density and concentrations of fumarate and succinate. Acetate (5.5 mM) was the electron donor and the limiting substrate. The electron acceptor was fumarate (30mM). Three biological replicates of control and treatment cells were obtained to produce hybridizations for this experiment.

ORGANISM(S): Geobacter sulfurreducens  

SUBMITTER: Joseph White   Barbara Methe  

PROVIDER: E-TIGR-128 | ArrayExpress | 2005-01-01


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DNA microarray and proteomic analyses of the RpoS regulon in Geobacter sulfurreducens.

Núñez Cinthia C   Esteve-Núñez Abraham A   Giometti Carol C   Tollaksen Sandra S   Khare Tripti T   Lin Winston W   Lovley Derek R DR   Methé Barbara A BA  

Journal of bacteriology 20060401 8

The regulon of the sigma factor RpoS was defined in Geobacter sulfurreducens by using a combination of DNA microarray expression profiles and proteomics. An rpoS mutant was examined under steady-state conditions with acetate as an electron donor and fumarate as an electron acceptor and with additional transcriptional profiling using Fe(III) as an electron acceptor. Expression analysis revealed that RpoS acts as both a positive and negative regulator. Many of the RpoS-dependent genes determined p  ...[more]

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