Query: NC_014364:2693840 Spirochaeta smaragdinae DSM 11293 chromosome, complete genome Lineage: Spirochaeta smaragdinae; Spirochaeta; Spirochaetaceae; Spirochaetales; Spirochaetes; Bacteria General Information: Country: Congo; Environment: Oil fields; Isolation: Oil field of Congo, Africa; Temp: Mesophile; Temp: 35C. Spirochaeta smaragdinae was isolated from an oil field in Central Africa. The species is Gram-negative, motile, obligately halophilic and strictly anaerobic and is of interest because it is able to ferment numerous polysaccharides.
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General Information: This strain was isolated from a human skin biopsy in Brazil, and passaged in nude mice and armadillos. The bacterium is a close relative of M. tuberculosis. However, compared to the latter, the genome of M. leprae is smaller due to reductive genome evolution, with many important metabolic activities including siderophore production, part of the oxidative chain, most of the microaerophilic and anaerobic respiratory chains, and numerous catabolic systems and their regulatory circuits eliminated due to extensive recombination events between dispersed repetitive sequences. It is evident that this species has undergone massive genome reduction over time as a result of its parasitic nature, discarding more than half its genes and rendering it the most striking example of genome reduction in a microbial pathogen.