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Figure 4.
Figure 4. Implications for cleavage and recognition. a,
Superposition of the structure of the scissile phosphate groups
of the target nucleotide from the uncomplexed substrate SRL
RNA^11 (red), the 3' splice site of a splicing endonuclease^19
(yellow) and the ground state forms of the lead-dependent22
(navy) and the hammerhead^20 (blue) ribozymes. b, Superposition
of the structures of the two types of S-turn: one in the bound
complex (blue) and another in the L11 -RNA complex38 (yellow).
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