In
taxonomy
Taxonomy is the practice and science of categorization or classification.
A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types. ...
, ''Ruegeria'' is a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of the
Rhodobacteraceae
The Rhodobacteraceae are a family of Pseudomonadota in the order Rhodobacterales within the alpha subgroup.See the NCBIbr>webpage on Rhodobacteraceae Data extracted from the Like all Pseudomonadota, they are gram-negative. It contains chemo ...
.
This genus was formerly known as the marine ''
Agrobacterium
''Agrobacterium'' is a genus of Gram-negative bacteria established by H. J. Conn that uses horizontal gene transfer to cause tumors in plants. ''Agrobacterium tumefaciens'' is the most commonly studied species in this genus. ''Agrobacterium'' is ...
'' before they were reclassified in 1998. It bears in fact the name of Hans-Jürgen Rüger, a German microbiologist, for his contribution to the taxonomy of marine species of ''Agrobacterium''.
Characteristics
The genus is characterised by members who are:
*
Gram-negative
Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall ...
(like all Proteobacteria)
* ovoid to rod-shaped cells 0.6–1.6 × 1.0–4.0 µm
* motile by polar flagella, or nonmotile
* non-sporeformers
* aerobic
* oxidase and catalase positive
* are incapable of photosynthetic growth
*
bacteriochlorophyll a is absent
* major
quinone
The quinones are a class of organic compounds that are formally "derived from aromatic compounds uch as benzene or naphthalene
Uch ( pa, ;
ur, ), frequently referred to as Uch Sharīf ( pa, ;
ur, ; ''"Noble Uch"''), is a historic city in the southern part of Pakistan's Punjab province. Uch may have been founded as Alexandria on the Indus, a town founded by Alexand ...
by conversion of an even number of –CH= groups into –C(=O)– groups with any necessary rearrangement of double ...
is ubiquinone 10
*
mol% G+C of the DNA is 55–59
* member of the family ''Rhodobacteraceae'', which is phenotypically, metabolically, ecologically diverse and defined based on 16S sequences data
Phylogenetically it is very close to the genus ''Silicibacter'', but the two remain separate species due to phenotypic differences — two species for which this is problematic are ''Ruegeria lacuscaerulensis'' and ''Ruegeria pomeroyi''.
Two species that have been removed from the genus are Marinovum algicola (Ruegeria algicola) and Thalassobius gelatinovorus (Ruegeria gelatinovora).
nd refs therein/nowiki>
Small non-coding RNAs
Highly abundant
bacterial small RNA Bacterial small RNAs (bsRNA) are small RNAs produced by bacteria; they are 50- to 500-nucleotide non-coding RNA molecules, highly structured and containing several stem-loops. Numerous sRNAs have been identified using both computational analysis and ...
s have been shown to be present in the bacteria subjected to chronic nutrient limitation. In ''Ruegeria pomeroyi'' RNAseq analysis identified 99 putative sRNAs. The bacterial sRNAs regulatory mechanisms are typically based on direct RNA-RNA interaction with a target mRNA.
The target gene groups identified by Rivers et al. were genes involved in transport, genes mediating cell-cell interactions, signal transduction and transcriptional regulation.
References
Further reading
Scientific journals
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Scientific books
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Scientific databases
External links
Rhodobacteraceae
Bacteria genera
{{Rhodobacterales-stub