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  • Deuterostomes  (1)
  • Intracellular symbiont  (1)
  • 1990-1994  (2)
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  • 1990-1994  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    What causes the aphid 28S rRNA to lack the hidden break? (1990)
    Springer
    Journal of molecular evolution 30 (1990), S. 509-513 
    Details
    ISSN: 1432-1432
    Keywords: Aphid ; 28S rRNA ; Hidden break ; Gap region ; Stem-loop structure ; UAAU tract ; Protostomes ; Deuterostomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In order to determine why the aphid 28S rRNA lacks the hidden break otherwise found in insects, the structure of the region of the aphid ribosomal DNA (rDNA) corresponding to the gap region, which in other insect rDNA transcripts is excised posttranscriptionally, was studied. Sequence comparison suggested that, in contradistinction to what is found in rDNA transcripts of other insects, a stem-loop structure formed in this region of the aphid rDNA transcript is not AU-rich. Nor did the loop of the aphid molecule contain the UAAU tract that can be a signal for the introduction of the hidden break, suggesting that in this particular region the aphid 28S rRNA resembles 28S rRNAs of deuterostomes, which do not contain the hidden break.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101106
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  • 2
    Electronic Resource
    Electronic Resource
    Accumulation of adenine and thymine in agroE-homologous operon of an intracellular symbiont (1993)
    Springer
    Journal of molecular evolution 36 (1993), S. 121-126 
    Details
    ISSN: 1432-1432
    Keywords: Aphid ; Intracellular symbiont ; groE operon ; Nucleotide sequence ; Codon usage ; Directional mutation ; A/T pressure ; Selection ; Cell organelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary As a result of the nucleotide sequence analysis of an aphid endosymbiont's operon homologous to theEscherichia coli groE, we noted that directional base substitutions tending toward an increase of A + T content represent an obvious evolutionary trend in this prokaryotic operon, housed for a long period by an eukaryotic cell. This result, when taken together with previous reports, raised the possibility that genomic DNA of prokaryotes residing in an eukaryotic cell is subject to A/T-biased directional mutation pressure and/or both negative and positive selection operating under conditions specific to the intracellular environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166247
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    Paper (German National Licenses)
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