title: Asticcacaulis benevestitus sp. nov., a psychrotolerant, dimorphic, prosthecate bacterium from tundra wetland soil.
abstract: A Gram-negative, aerobic, heterotrophic, non-pigmented, dimorphic prosthecate bacterium was isolated from tundra wetland soil and designated strain Z-0023(T). Cells of this strain had a dimorphic life cycle and developed a non-adhesive stalk at a site not coincident with the centre of the cell pole, a characteristic typical of representatives of the genus Asticcacaulis. A highly distinctive feature of cells of strain Z-0023(T) was the presence of a conical, bell-shaped sheath when grown at low temperature. This prosthecate bacterium was a psychrotolerant, moderately acidophilic organism capable of growth between 4 and 28 degrees Celsius (optimum 15-20 degrees Celsius) and between pH 4.5 and 8.0 (optimum 5.6-6.0). The major phospholipid fatty acid was 18 : 1omega7c and the major phospholipids were phosphatidylglycerols. The G+C content of the DNA was 60.4 mol%. On the basis of 16S rRNA gene sequence similarity, strain Z-0023(T) was most closely related to Asticcacaulis biprosthecium (98 % similarity), Asticcacaulis taihuensis (98 %) and Asticcacaulis excentricus (95 %). However, low levels of DNA-DNA relatedness to these organisms and a number of distinctive features of the tundra wetland isolate indicated that it represented a novel species of the genus Asticcacaulis, for which the name Asticcacaulis benevestitus sp. nov. is proposed. The type strain is Z-0023(T) (=DSM 16100(T)=ATCC BAA-896(T)).
authors.affiliation: S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Octyabrya 7/2, Moscow 117312, Russia.
authors.forename: Lina V
authors.initials: LV
authors.lastname: Vasilyeva
authors.affiliation: S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Octyabrya 7/2, Moscow 117312, Russia.
authors.forename: Marina V
authors.initials: MV
authors.lastname: Omelchenko
authors.affiliation: S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Octyabrya 7/2, Moscow 117312, Russia.
authors.forename: Yulia Y
authors.initials: YY
authors.lastname: Berestovskaya
authors.affiliation: S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Octyabrya 7/2, Moscow 117312, Russia.
authors.forename: Anatolii M
authors.initials: AM
authors.lastname: Lysenko
authors.affiliation: German Research Centre for Biotechnology, Chemical Microbiology, Mascheroder Weg 1, D-38124 Braunschweig, Germany.
authors.forename: Wolf-Rainer
authors.initials: WR
authors.lastname: Abraham
authors.affiliation: S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Octyabrya 7/2, Moscow 117312, Russia.
authors.forename: Svetlana N
authors.initials: SN
authors.lastname: Dedysh
authors.affiliation: S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Octyabrya 7/2, Moscow 117312, Russia.
authors.forename: George A
authors.initials: GA
authors.lastname: Zavarzin
mesh_terms: D015373:Bacterial Typing Techniques; D001482:Base Composition / Q000235:genetics*; D042063:Caulobacteraceae / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D004269:DNA, Bacterial / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis*; D008969:Molecular Sequence Data; D010743:Phospholipids / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000032:analysis*; D012988:Soil Microbiology; D013395:Sucrose / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D005227:Fatty Acids; D010743:Phospholipids; D012336:RNA, Ribosomal, 16S; D013395:Sucrose