Skip to main content
Figure 1 | BMC Evolutionary Biology

Figure 1

From: Phylogenetic analyses suggest reverse splicing spread of group I introns in fungal ribosomal DNA

Figure 1

Group I intron splicing. A) The typical secondary structure of a group I intron which consists of about ten paired elements (P1–P10). The intron internal guide sequence (IGS) is shown that recognizes the 5' exon sequence through a 4–6 nt base pairing, thereby initiating the two-step splicing mechanism (shown in panel B) for group I intron removal from pre-RNA. B) The forward and reverse splicing of a group I intron is shown in this figure. The arrows that lead from the free intron to the pre-RNA indicate the reverse splicing reaction. Both forward and reverse splicing reactions require the IGS interaction in domain P1.

Back to article page