Last modified on 10 September 2001.

Literature Reference:

Bhattacharya D., Cannone J.J., and Gutell R.R. (2001)
Group I Intron Lateral Transfer Between Red and Brown Algal Ribosomal RNA.
Current Genetics. 40:82-90.


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Figures
Figure 1: Analysis of intron secondary structures (Composite)
  1. Secondary structure model for the Bangia atropurpurea group IC1 intron at position 516 in the SSU rRNA.
  2. Secondary structure model for the Aureoumbra lagunensis group IC1 intron at position 516 in the SSU rRNA.
  3. Comparison of the P5abc domains in the 516 introns from Tetrahymena thermophila, Bangia fuscopurpurea, and Porphyra leucosticta.
  4. Alignment of the P5b region showing the insertion.
(PDF)
Figure 2: Plots of uncorrected pairwise substitutions vs. values corrected for multiple hits for the group I intron data set from Figure 3. (PDF)
Figure 3: Phylogeny of IC1 and IE introns interrupting the nuclear SSU rRNA of different eukaryotes. (PDF)
Figure 4: Phylogeny of selected red algae (Rhodophytes) and stramenopiles based on SSU rRNA sequence comparisons. (PDF)
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Tables
Table 1: List of organisms containing the inserted helix in the P5b region of the IC1 516 introns. (HTML)
Table 2: Base-pair frequencies for the inserted helix in P5b found in the red and brown algae. (HTML)
Additional
Tables
Table: List of 61 Acanthamoebidae SSU rRNA sequences. (HTML)
Table: List of 373 stramenopile SSU rRNA sequences. (HTML)
Alignment
Files
18S rRNA Alignment in AE2 (Macke) Format (file size: 4.6 MB). (AE2)
Alignment in GenBank Format (file size: 3.7 MB). (GB)
List of Sequences in the Alignment. (HTML)
Group I Introns Alignment in AE2 (Macke) Format (file size: x.x MB). (AE2)
Alignment in GenBank Format (file size: x.x MB). (GB)
List of Sequences in the Alignment. (HTML)
Intron
Secondary
Structure
Diagrams
Acanthamoeba griffini (U02540 | U07412) PS | PDF
Acanthamoeba griffini (S81337) PS | PDF
Aureoumbra lagunensis (U40258) PS | PDF
Bangia atropurpurea (D88387) PS | PDF
Bangia fuscopurpurea (AF342745) PS | PDF
Porphyra leucosticta (AF342746) PS | PDF
Tetrahymena thermophila (J01235 | V01416) PS | PDF