Strain 2Kl is the first free-living bacterium in which R bodies were detected. R bodies, previously known as kappa particles, consist of convoluted, proteinaceous ribbons and are typical and distinctive inclusions of cells of the genus Preer and Preer, obligately endosymbiotic bacteria of the species complex. Strain 2Kl is a yellow-pigmented, polarly flagellated, mesophilic, hydrogen-oxidizing bacterium. This facultatively chemolithoauto-trophic organism can grow heterotrophically and is able to utilize a wide range of sugars; it can also grow heterotrophically as a denitrifying bacterium, but it does not fix nitrogen. Autotrophically grown cells contain a membrane-bound hydrogenase. Morphologically and biochemically, strain 2Kl differs from other hydrogen-oxidizing bacteria and from the known species of This bacterium is considered to be a new species, for which the name is proposed. The specific epithet refers to the outstanding property of this organism, namely, that it contains R bodies (i.e., inclusion bodies consisting of convoluted proteinaceous ribbons). The type strain of , strain 2Kl, has been deposited with the Deutsche Sammlung von Mikroorganismen as strain DSM 2082.


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