Pseudomonas taeniospiralis sp. nov., an R-Body-Containing Hydrogen Bacterium

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Abstract
Strain 2K1 is the 1st 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 Caedibacter Preer and Preer, obligately endosymbiotic bacteria of the Paramecium aurelia species complex. Strain 2K1 is a yellow-pigmented, polarly flagellated, mesophilic, H2-oxidizing bacterium. This facultatively chemolithoautotrophic 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 N2. Autotrophically grown cells contain a membrane-bound hydrogenase. Morphologically and biochemically, strain 2K1 differs from other H2-oxidizing bacteria and from known Caedibacter spp. This bacterium is considered to be a new species, for which the name P. taeniospiralis 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 P. taeniospiralis, strain 2K1, was deposited with the Deutsche Sammlung von Mikroorganismen as strain DSM 2082.