Maribacter antarcticus sp. nov., a psychrophilic bacterium isolated from a culture of the Antarctic green alga Pyramimonas gelidicola.
ABSTRACT A psychrophilic, Gram-negative, dark orange-pigmented bacterium, designated CL-AP4(T), was isolated from a culture of the green alga Pyramimonas gelidicola obtained from the Southern Ocean. Strain CL-AP4(T) grew optimally at 10 degrees C, in the presence of 3-4 % sea salts and at pH 8. 16S rRNA gene sequence analysis revealed that strain CL-AP4(T) belonged to the family Flavobacteriaceae, with Maribacter arcticus KOPRI 20941(T) as its closest relative (97.2 % similarity). A number of chemotaxonomic characteristics supported affiliation of strain CL-AP4(T) with the genus Maribacter, i.e. iso-C(15 : 0) (17.2 %), iso-C(15 : 1) (16.8 %) and iso-C(17 : 0) 3-OH (14.9 %) were the dominant fatty acids, MK-6 was the major menaquinone and the DNA G+C content was 37.1 mol%. DNA-DNA relatedness between CL-AP4(T) and M. arcticus KOPRI 20941(T) was only 10 %, suggesting that they are genomically distinct species. In addition, strain CL-AP4(T) differed phenotypically from M. arcticus in its optimum growth temperature, its ability to hydrolyse starch, Tween 40 and Tween 80, and production of certain enzymes. On the basis of the results of the polyphasic analysis, strain CL-AP4(T) was classified in the genus Maribacter as belonging to a novel species, for which the name Maribacter antarcticus sp. nov. is proposed; the type strain is CL-AP4(T) (=KCCM 90069(T)=JCM 15445(T)).
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ABSTRACT: Strain HTCC2170 was isolated from surface waters off the Oregon coast using dilution-to-extinction culturing. Here, we present the finished genome sequence of a marine bacterium, Maribacter sp. strain HTCC2170. Strain sp. HTCC2170 is predicted to be a facultatively aerobic chemoorganotroph that, based on genomic sequence analysis, is capable of macromolecule degradation and anaerobic respiration.Journal of bacteriology 10/2010; 193(1):303-4. DOI:10.1128/JB.01207-10 · 2.69 Impact Factor
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ABSTRACT: The anthropocentric term "extremophile" was introduced more than 30 years ago to describe any organism capable of living and growing under extreme conditions-i.e., particularly hostile to human and to the majority of the known microorganisms as far as temperature, pH, and salinity parameters are concerned. With the further development of studies on microbial ecology and taxonomy, more "extreme" environments were found and more extremophiles were described. Today, many different extremophiles have been isolated from habitats characterized by hydrostatic pressure, aridity, radiations, elevated temperatures, extreme pH values, high salt concentrations, and high solvent/metal concentrations, and it is well documented that these microorganisms are capable of thriving under extreme conditions better than any other organism living on Earth. Extremophiles have also been investigated as far as the search for life in other planets is concerned and even to evaluate the hypothesis that life on Earth came originally from space. Extremophiles are interesting for basic and applied sciences. Particularly fascinating are their structural and physiological features allowing them to stand extremely selective environmental conditions. These properties are often due to specific biomolecules (DNA, lipids, enzymes, osmolites, etc.) that have been studied for years as novel sources for biotechnological applications. In some cases (DNA polymerase, thermostable enzymes), the search was successful and the final application was achieved, but certainly further exploitations are next to come.Naturwissenschaften 03/2011; 98(4):253-79. DOI:10.1007/s00114-011-0775-2 · 1.97 Impact Factor