The Vertebrate 7S K RNA Separates Hagfish (Myxine glutinosa) and Lamprey (Lampetra fluviatilis)

@article{Grsoy2000TheV7,
  title={The Vertebrate 7S K RNA Separates Hagfish (Myxine glutinosa) and Lamprey (Lampetra fluviatilis)},
  author={Halil-Cem G{\"u}rsoy and Dorota Koper and Bernd J. Benecke},
  journal={Journal of Molecular Evolution},
  year={2000},
  volume={50},
  pages={456-464}
}
Abstract. 7S RNA sequences from the hagfish (Myxiniformes) and lamprey (Petromyzontiformes) were cloned and analyzed. In both species, 7S L RNA (also designated SRP RNA, since it represents the RNA constituent of the signal recognition particle) was clearly detectable. The sequence similarity between the two species was 86%, compared with about 75% similarity between either of these species and mammals. 7S K RNA was also cloned from the lamprey. The similarity between the 7S K RNA of the… 

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References

SHOWING 1-10 OF 53 REFERENCES

Evidence from 18S ribosomal RNA sequences that lampreys and hagfishes form a natural group.

TLDR
Phylogenetic comparisons of 18S ribosomal RNA sequences from two hagfishes, two lampreys, a tunicate, a lancelet, and a number of gnathostomes support the monophyly of the cyclostomes, forcing a reassessment of several features of early vertebrate evolution.

Complete sequence of the amphioxus (Branchiostoma lanceolatum) mitochondrial genome: relations to vertebrates

TLDR
The complete nucleotide sequence of the mitochondrial DNA of the amphioxus Branchiostoma lanceolatum has been determined, and the notion that prochordates may be viewed as the brother group of vertebrates is reinforced.

Structural analyses of the 7SK ribonucleoprotein (RNP), the most abundant human small RNP of unknown function

TLDR
The human 7SK ribonucleoprotein (RNP) has been analyzed to determine its RNA secondary structure and protein constituents, and the possibility that the 7SK RNP is an unrecognized component of the pre-mRNA processing machinery is discussed.

Primary and secondary structure of 7-3 (K) RNA of Novikoff hepatoma.

TLDR
The complete nucleotide sequence of 7-3 RNA was determined by RNA-sequencing methods, and the sequence is compared with several small RNAs and repetitive DNA sequences for homology.

Faithful in vitro transcription by fission yeast RNA polymerase III reveals unique alpha-amanitin sensitivity.

TLDR
Results demonstrate that in contrast to the yeast Saccharomyces cerevisiae, pol III from S. pombe is sensitive to high concentrations of alpha-amanitin, yet with a clearly different dose response than that observed with the corresponding RNA polymerase of higher eukaryotes.

A subset of yeast snRNA's contains functional binding sites for the highly conserved Sm antigen.

TLDR
The hypothesis was tested that yeast also contains functional analogues of Sm snRNA's, but that the Sm binding site in the RNA is more strictly conserved than the Sm antigenic determinant.

7SL RNA from Schizosaccharomyces pombe is encoded by a single copy essential gene

We have identified an abundant ribonucleoprotein particle from Schizosaccharomyces pombe with properties related to those of the vertebrate signal recognition particle (SRP), including cytoplasmic

14 The Diverse World of Small Ribonucleoproteins

Among the major players in the functioning of present-day eukaryotic cells are small complexes consisting of RNA and protein. Small ribonucleoprotein (RNP) particles, defined as tight complexes

Saccharomyces cerevisiae has a U1-like small nuclear RNA with unexpected properties.

TLDR
Several regions of significant homology to U1 have now been found in cloned and sequenced snR19, and ten out of ten matches to the 5' end of U1, the site known to interact with the5' splice site of mammalian introns, are found.
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