Topic
Haloplasma
About: Haloplasma is a research topic. Over the lifetime, 3 publications have been published within this topic receiving 100 citations. The topic is also known as: Haloplasma contractile.
Papers
TL;DR: The phenotypic and phylogenetic data clearly show the distinctiveness of this unusual bacterium, and it is proposed that strain SSD-17B(T) (= DSM 18853 = JCM 14575) represents a new genus and a new species, for which the name Haloplasma contractile gen. nov.
Abstract: A novel strictly anaerobic bacterium designated strain SSD-17BT was isolated from the hypersaline brine-sediment interface of the Shaban Deep, Red Sea. Cells were pleomorphic but usually consisted of a central coccoid body with one or two “tentacle-like” protrusions. These protrusions actively alternated between a straight, relaxed form and a contracted, corkscrew-like one. A peptidoglycan layer was not detected by electron microscopy. The organism forms “fried-egg”-like colonies on MM-X medium. The organism is strictly anaerobic and halophilic and has an optimum temperature for growth of about 30 to 37°C and an optimum pH of about 7. Nitrate and nitrite are reduced; lactate is a fermentation product. The fatty acid profile is dominated by straight saturated and unsaturated chain compounds. Menaquinone 4 is the major respiratory quinone. Phylogenetic analysis demonstrated strain SSD-17BT represents a novel and distinct lineage within the radiation of the domain Bacteria. The branching position of strain SSD-17BT was equidistant to the taxa considered to be representative lineages of the phyla Firmicutes and Tenericutes (with its sole class Mollicutes). The phenotypic and phylogenetic data clearly show the distinctiveness of this unusual bacterium, and we therefore propose that strain SSD-17BT (= DSM 18853 = JCM 14575) represents a new genus and a new species, for which we recommend the name Haloplasma contractile gen. nov., sp. nov. We are also of the opinion that the organism represents a new order-level taxon, for which we propose the name Haloplasmatales.
93 citations
1 Jan 2014
TL;DR: Members of the Haloplasmataceae have been isolated from the upper sediments of a deep-sea anoxic brine in the Red Sea, but cultivation-independent studies have found related sequences in a wide range of biotopes including other extreme environments, con- taminated soils and marine sediments, as well as intestinal samples.
Abstract: Haloplasmataceae is a family within the
order Haloplasmatales, which currently
includes one single genus and species:
Haloplasma contractile. This family has
unusual phenotypic features –the most
noticeable being a unique morphology and
cellular contractility cycle– and a distinct
phylogenetic position between the
Firmicutes and the Tenericutes
(Mollicutes).
Members of the Haloplasmataceae have
been isolated from the upper sediments of
a deep-sea anoxic brine in the Red Sea, but
cultivation-independent studies have
found related sequences in a wide range of
biotopes including other extreme
environments, con- taminated soils and
marine sediments, as well as intestinal
samples. The isolation and description of
new representatives of this family might
therefore result in significant changes to
the current description.
6 citations
TL;DR: The draft genome of Haloplasma contractile is presented, isolated from a deep-sea brine and representing a new order between Firmicutes and Mollicutes, which appears to be the highest copy number ever reported.
Abstract: We present the draft genome of Haloplasma contractile, isolated from a deep-sea brine and representing a new order between Firmicutesand Mollicutes. Its complex morphology with contractile protrusions might be strongly influenced by the presence of seven MreB/Mbl homologs, which appears to be the highest copy number ever reported.
Performance Metrics
| Year | Papers |
|---|---|
| 2014 | 1 |
| 2011 | 1 |
| 2008 | 1 |