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Transfer of Pseudomonas aminovorans (den Dooren de Jong 1926) to Aminobacter gen. nov. as Aminobacter aminovorans comb. nov. and Description of Aminobacter aganoensis sp. nov. and Aminobacter niigataensis sp. nov.

¹Biochemicals Division, Mitsubishi Gas Chemical Co., Seavans-N Building, 1-2-1, Shibaura, Minato-ku, Tokyo 105, Japan
²Niigata Research Laboratory, Mitsubishi Gas Chemical Co., Niigata 950-31, Japan
³Japan Collection of Microorganisms, The Institute of Physical and Chemical Research, Wacho-shi, Saitama 351-01, Japan
⁴Institute of Applied Microbiology. The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

^* Corresponding author.

ABSTRACT

We compared non-methane-, non-methanol-, and methylamine-utilizing bacteria, including Pseudomonas aminovorans, a tetramethylammonium-utilizing bacterium, and an N-N-dimethylformamide-utilizing bacterium. These bacteria are gram-negative, nonsporeforming, subpolarly flagellated, rod-shaped organisms. Reproduction occurs by budding. The DNA base compositions are 62 to 64 mol% guanine plus cytosine. The cellular fatty acids contain a large amount of C_18:1 acid. The major hydroxy acid is 3-OH C_12:0 acid. The major ubiquinone is ubiquinone Q-10. These bacteria are clearly separated from authentic Pseudomonas species (Pseudomonas fluorescens rRNA group) on the basis of utilization of methylamine, morphological and chemotaxonomic characteristics, DNA-DNA homology, and rRNA-DNA homology. They were divided into three subgroups on the basis of their physiological characteristics and DNA-DNA homology data. A new genus, Aminobacter, and three new species, Aminobacter aminovorans comb. nov., Aminobacter aganoensis sp. nov., and Aminobacter niigataensis sp. nov., are proposed. The type species of Aminobacter gen. nov. is A. aminovorans, with type strain JCM 7852. The type strain of A. aganoensis is strain TH-3 (= JCM 7854), and the type strain of A. niigataensis is strain DM-81 (= JCM 7853).