1.3.99.33 Structural characterization of the microbial enzyme urocanate reductase mediating imidazole propionate production Shewanella oneidensis 1.3.99.33 Urocanate reductase: identification of a novel anaerobic respiratory pathway in Shewanella oneidensis MR-1 Shewanella oneidensis 1.3.99.33 Urocanate reductase: identification of a novel anaerobic respiratory pathway in Shewanella oneidensis MR-1 Shewanella oneidensis MR-1 / ATCC 700550