Sequence heterogeneity between the two genes encoding 16S rRNA from the halophilic archaebacterium Haloarcula marismortui
Article Abstract:
The two rRNA operons in Haloarcula marismortui were sequenced and compared to the homologous sequences in other related halophilic bacteria. The results showed a total of 74 nucleotide differences between the two operons. The substitutions were distributed within three domains of the 16S rRNA, with majority of the substututions occuring within the 508-823 domain. Although both operons are equally represented in the 70S ribosome subunit, the rRNA encoded by rrnB showed more sequence divergence in the 508-823 domain than those encoded by rrnA. The evolutionary significance of the sequence heterogeneity within the rRNA genes are discussed.
Publication Name: Genetics
Subject: Biological sciences
ISSN: 0016-6731
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
Frequent changes in the number of reiterated ribosomal RNA genes throughout the life cycle of the basidiomycete Coprinus cinereus
Article Abstract:
Contour-clamped homogenous electric field method was employed in the measurement of two HindIIIDNA fragments encoding for ribosomal RNA from mitotic and meiotic segregants ofCoprinus cinereus. The larger of the two fragments exhibited variability in size. The transmission of these fragment was studied in three crosses. Each tetrad in one of the three crosses had at least one alteration. The 2:2 segregation ratio observed in half of these tetrads indicate that alterations occur between mating and meiosis. Further, changes were found to be frequent and independent of life cycle stage.
Publication Name: Genetics
Subject: Biological sciences
ISSN: 0016-6731
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
Molecular characterization of the [phaEC.sub.Hm] genes, required for biosynthesis of poly (3-hydroxybutyrate) in the extremely halophilic archaeon Haloarcula marismortui
Article Abstract:
The atomic parts of [phaEC.sub.Hm] genes, essential for poly (3-hydroxybutyrate) (PHB) accumulation and polyhydroalkanotes (PHA) synthase activity in Haloarcula marismortui ATCC43049 were examined. Results conclude that for biosynthesis of PHB and for encoding an active PHA synthase in the Haloarcula species, [phaEC.sub.Hm] genes are required.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 2007
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Structural, functional and mutational analysis of the pfr gene encoding a ferritin from Helicobacter pylori. Identification of a 29 kDa flagellar sheath protein in Helicobacter pylori using a murine monoclonal antibody
- Abstracts: Characterization of di-myo-inositol-1,1'-phosphate in the hyperthermophilic bacterium Thermotoga maritima. Signature lipids and stable carbon isotope analyses of Octopus Spring hyperthermophilic communities compared with those of Aquificales representatives
- Abstracts: Phylogenetic analyses of some extremely halophilic archaea isolated from dead sea water, determined on the basis of their 16S rRNA sequences
- Abstracts: Molecular and genetic analyses of the B type surface protein gene from Paramecium tetraurelia. Interactions between genes involved in exocytotic membrane fusion in Paramecium
- Abstracts: Tandem organization and highly disparate expression of the two laccase genes lcc1 and lcc2 in the cultivated mushroom Agaricus bisporus