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As described previously, in Rhodococcus sp. (formerly Nocardia opaca) strains MR11 and MR22, the ability to grow as an aerobic hydrogen bacterium (the Aut character) is located on giant conjugative linear plasmids--on pHG201 (270 kb) in strain MR11 and on pHG205 (280 kb) in strain MR22. In an autotrophic transconjugant originating from MR22 a smaller plasmid, pHG207 (225 kb), was detected and shown to be a recombination product of the wild-type plasmids pHG204 and pHG205. A donor carrying pHG207 as the sole plasmid transferred the Aut marker at a 1000-fold frequency compared to the wild-type plasmid pHG205. Analysis of the plasmid ends revealed that plasmid pHG207 carries proteins at both ends; the proteins are linked to the 5' ends of the strands. The cloned end fragments of about 2 kb were sequenced and found to contain highly homologous sequences within the terminal 583 bp (left end part) and 560 bp (right end part). Several potential reading frames were detected, but database searching gave no indication about possible functions.

The giant linear plasmid pHG207 from Rhodococcus sp. encoding hydrogen autotrophy: characterization of the plasmid and its termini