Patent
In preferred embodiments, the present invention provides new isolated strains of a Geobacter species that are capable of using a carbon source that is selected from C 3 to C 12 organic compounds selected from pyruvate or metabolic precursors of pyruvate as an electron donor in metabolism and in subsequent energy production. In other aspects, other preferred embodiments of the present invention include methods of making such strains and methods of using such strains. In general, the wild type strain of the microorganisms has been shown to be unable to use these C 3 to C 12 organic compounds as electron donors in metabolic steps such as the reduction of metallic ions. The inventive strains of microorganisms are useful for improving bioremediation applications, including in situ bioremediation (including uranium bioremediation and halogenated solvent bioremediation), microbial fuel cells, power generation from small and large-scale waste facilities (e.g., biomass waste from dairy, agriculture, food processing, brewery, or vintner industries, etc.) using microbial fuel cells, and other applications of microbial fuel cells, including, but not limited to, improved electrical power supplies for environmental sensors, electronic devices, and electric vehicles.
1. An isolated Geobacter sulfurreducens strain identified as ATCC deposit PTA-10250 capable of effective utilization of an organic compound selected from the group consisting of pyruvate and C 3 to C 12 metabolic precursors of pyruvate as an electron donor, and having a functional mutation in a gene encoding a repressor of an enzyme of the tricarboxylic acid cycle.
2. The isolated Geobacter strain of claim 1 wherein the functional mutation is in a gene encoding a transcriptional repressor acting on the succinyl-CoA synthetase promoter, wherein the mutation results in the activation of the succinyl CoA synthetase enzyme.
3. The isolated Geobacter strain of claim 1 wherein the functional mutation is in the gene encoding GSU0514.