Project description:This SuperSeries is composed of the following subset Series: GSE22497: Transcriptome analysis of Geobacter sulfurreducens under multiple growth conditions GSE22503: ChIP-chip of Geobacter sulfurreducens PCA with antibody against RNAP and RpoD under various conditions GSE22511: Genome-wide transcription start site determination of Geobacter sulfurreducens under multiple growth conditions Refer to individual Series
Project description:Geobacter sulfurreducens is a dissimilatory metal-reducing bacterium capable of forming thick electron-conducting biofilms on solid electrodes in the absence of alternative electron acceptors. The remarkable ability of such biofilms to transfer electrons, liberated from soluble organic electron donors, over long distances has attracted scientific interest as to the mechanism for this process, and technological interest for application to microbial fuel and electrolysis cells and sensors. Here, we employ comparative proteomics to identify key metabolic pathways involved in G. sulfurreducens respiration by planktonic cells versus electron-conducting biofilms, in an effort to elucidate long-range electron transfer mechanisms.
Project description:In this study we further investigate the previously observed syntrophic interaction between Geobacter sulfurreducens and Pseudomonas aeruginosa. In early coculture establishment, two genetic variants of G. sulfurreducens emerged that were strongly selected for throughout coculture evolution. Single nucleotide polymorphism (SNP) variants occurred in fabI and tetR genes of G. sulfurreducens. The tetR variants displayed upregulation of adenylate cyclase transporter, CyaE and of RND efflux pump proteins as determined through SWATH-MS proteomics.
