NDLI: Magnetospirillum aberrantis sp. nov., a new freshwater bacterium with magnetic inclusions

Content Provider	Springer Nature Link
Author	Gorlenko, V. M. Dzyuba, M. V. Maleeva, A. N. Panteleeva, A. N. Kolgava, T. V. Kuznetsov, B. B.
Copyright Year	2011
Abstract	A new strain of spirilla, SpK, was isolated from the bottom sediments of Ol’khovka River near Kislovodsk (Caucasus). The bacteria (0.4 ±1.5 μm) were motile, with polar flagella. They grew within the temperature range from 20 to 45°C, with the optimum at 31°C. The pH growth optimum was at 6.5–6.9. The main type of metabolism was respiratory, chemoorganotrophic. The organism was microaerophilic, with the growth optimum at 1–5% O$_{2}$ in the gas phase. Catalase activity was absent, while oxidase activity was detected. Good growth occurred in media with various organic acids, especially acetate and fumarate. Sugars and alcohols were not utilized. Importantly, the strain did not grow on casein hydrolysate and grew well on glycerol. The bacteria contained the RuBisCo cbbm gene (form II). Thiosulfate, ammonium, and ferrous iron were not used as electron donors for autotrophic growth. Unlike sulfate, thiosulfate, ferric iron, or perchlorate, nitrate could be used as an electron acceptor for photoheterotrophic growth. Strain SpK was characterized by the ability to form small, dense intracellular granules (30–40 nm) occurring in clusters or short chains. These inclusions were shown to have magnetic properties. Unlike magnetosomes, the granules did not form long chains. Invaginations of vesicular membranes similar to those found in the known magnetosomeforming microorganisms were observed. The DNA G + C content was 62.6 mol %. Ubiquinone Q $_{10}$ was present. The main fatty acids were 18:1ω7 (58.19%), 16:0 (19.23%), 16:1ω7 (11.12%), and 18:0 (1.91%). Polyhydroxybutyrate and polyphosphates were the storage compounds. Analysis of the 16S rRNA gene sequence revealed that the strain belonged to the phylum Alphaproteobacteria, family Rhodospirillaceae, genus Magnetospirillum. Strain SpK formed an isolated cluster on the phylogenetic tree. The similarity between strain SpK and the known Magnetospirillum species was from 96.1 to 96.4%. Thus, the new microorganism was classified as a new species of the genus Magnetospirillum, Magnetospirillum aberrantis sp. nov.
Starting Page	692
Ending Page	702
Page Count	11
File Format	PDF
ISSN	00262617
Journal	Microbiology
Volume Number	80
Issue Number	5
e-ISSN	16083237
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-10-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	magnetotactic bacteria taxonomy 16S rRNA phylogeny genus Magnetospirillum, Magnetospirillum aberrantis sp. nov. magnetosomes Medical Microbiology Microbiology
Content Type	Text
Resource Type	Article
Subject	Microbiology Applied Microbiology and Biotechnology

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