This subproject is one of many research subprojects utilizing theresources provided by a Center grant funded by NIH/NCRR. The subproject andinvestigator (PI) may have received primary funding from another NIH source,and thus could be represented in other CRISP entries. The institution listed isfor the Center, which is not necessarily the institution for the investigator.Shewanella confidences MR-1 is a motile facultative bacterium with remarkable metabolic versatility in regards to electron acceptor utilization; it can utilize O2, nitrate, fumarate, Mn, Fe, and S0 as terminal electron acceptors during respiration. This versatility allows MR-1 to efficiently compete for resources in environments where electron acceptor type and concentration fluctuate in space and time. The ability to effectively reduce polyvalent metals and radionuclides, including solid phase Fe and Mn oxides, has generated considerable interest in the potential role of this organism in biogeochemical cycling and in the bioremediation of contaminant metals and radionuclides. In spite of considerable effort, the details of MR-1's electron transport system and the mechanisms by which it reduces metals and radionuclides remain unclear. Even less is known regarding the molecular networks in this organism that allow it to respond to compete efficiently in a changing environment. The entire genome sequence of MR-1 has, in essence, been determined and high throughput methods for measuring gene expression are now available, including mass spec-based proteome analyses developed at PNNL. Although powerful, DNA array and proteome analyses must be tightly coupled with other approaches to effectively reveal the molecular details of how MR-1 functions in, and responds to, its environment.
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