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  • Rate of 5sRNA Evolution  (1)
  • Substitution rates  (1)
  • 1975-1979  (2)
  • 1960-1964
  • 1890-1899
Collection
Keywords
Publisher
Years
  • 1975-1979  (2)
  • 1960-1964
  • 1890-1899
Year
  • 1
    Electronic Resource
    Electronic Resource
    Evolution of 5sRNA (1975)
    Springer
    Journal of molecular evolution 7 (1975), S. 75-86 
    Details
    ISSN: 1432-1432
    Keywords: 5sRNA Evolution ; Rate of 5sRNA Evolution ; Phylogenic Tree
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The evolution of 5sRNA of 17 organisms ranging from human to bacteria has been studied using a sequence homology analysis. The evolutionary rate of 5sRNA genes has been estimated to be 2.2×10−10 replacement per one nucleotide site per year. This value is about the same as that of cytochrome C or tRNA's (≃ 2×10−10). A phylogenic tree of these organisms including both eukaryotes and prokaryotes has been constructed from the evolutionary distances (the rate of nucleotide substitution per site) data. The time of divergence of prokaryotes and eukaryotes was estimated to be ≳ 1.75×109 years ago and the branching order in eukaryotic kingdoms is consistent with the traditional order. Blue-green algae separated from the bacterial stem ≳ 1.3×109 years ago after eukaryotes had branched.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01732181
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  • 2
    Electronic Resource
    Electronic Resource
    The rates of evolution in some ribosomal components (1977)
    Springer
    Journal of molecular evolution 9 (1977), S. 191-201 
    Details
    ISSN: 1432-1432
    Keywords: Substitution rates ; 5s rRNA ; 5.8s rRNA ; Ribosomal proteins ; Pattern of amino acid substitution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The rate of nucleotide substitution (k(nuc)) of 5s RNA was estimated to be (1.8 ± 0.5) × 10−10 per site per year by comparing the nucleotide sequences of human andXenopus 5s RNA and using the geological time elapsed since the separation of mammals and amphibians. Similarly, k(nuc) of 5.8s rRNA was calculated to be 0.93 – 1.4 × 10−10 per site per year from the sequences of rat hepatoma cells andSaccharomyces cerevisiae. For the comparison of these data with the amino acid substitution rate of known proteins, the k(nuc) values of 5s rRNA and 5.8s rRNA were converted to the rate of amino acid substitution (k(aa′)). The k(aa′) values in pauling units were 0.4 and 0.2 – 0.3, respectively. The average k(aa) of ribosomal proteins was also estimated to be 0.2 – 0.3 pauling from the N-terminal amino acid sequences of seventeen 30s ribosomal proteins ofBacillus stearothermophilus andEscherichia coli. Thus, the evolutionary rates of these ribosomal components studied here are similar to each other; they are considerably slower than that of the known cellular proteins. Most, if not all, of the replacements in ribosomal proteins occurred between amino acids of a chemically similar nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01796108
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