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. 2000 Sep 1;28(17):3269–3277. doi: 10.1093/nar/28.17.3269

Figure 1.

Figure 1

The secondary structures of the two group IC3 introns and their conserved cores. (A) The secondary structure of the L-8 form of the group IC3 intron ribozyme from the tRNA precursor of Azoarcus sp. BH72. This form lacks the 5′-exon and the first 8 nt of the intron. The regions and nucleotides characteristic of this ribozyme are indicated in red. Broken lines indicate the tertiary interactions (GAAA loop × GAAA receptor, P4bp3 × J6/7-2 and P4bp5 × J8/7-5) discussed in the text. The ΔP2 form of this ribozyme lacks the P2–J2/3 region of the L-8 form. (B) The secondary structure of the L-8 form of the group IC3 intron ribozyme from the tRNA precursor of Synechococcus PCC6301. This also lacks the 5′-exon and the first 8 nt of the intron. The regions and nucleotides characteristic of this ribozyme are indicated in blue. Broken lines indicate the tertiary interactions (GAAA loop × GAAA receptor, P4bp3 × J6/7-2 and P4bp5 × J8/7-5) discussed in the text. The ΔP2 form of this ribozyme lacks the P2–J2/3 region of the L-8 form.