1ykv

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spinqualitylabelsall models 1ykv, resolution 3.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Crystal structure of the Diels-Alder ribozyme complexed with the product of the reaction between N-pentylmaleimide and covalently attached 9-hydroxymethylanthracene

Overview

The majority of structural efforts addressing RNA's catalytic function, have focused on natural ribozymes, which catalyze phosphodiester transfer, reactions. By contrast, little is known about how RNA catalyzes other, types of chemical reactions. We report here the crystal structures of a, ribozyme that catalyzes enantioselective carbon-carbon bond formation by, the Diels-Alder reaction in the unbound state and in complex with a, reaction product. The RNA adopts a lambda-shaped nested pseudoknot, architecture whose preformed hydrophobic pocket is precisely complementary, in shape to the reaction product. RNA folding and product binding are, dictated by extensive stacking and hydrogen bonding, whereas, stereoselection is governed by the shape of the catalytic pocket., Catalysis is apparently achieved by a combination of proximity, complementarity and electronic effects. We observe structural parallels in, the independently evolved catalytic pocket architectures for ribozyme- and, antibody-catalyzed Diels-Alder carbon-carbon bond-forming reactions.

About this Structure

1YKV is a Protein complex structure of sequences from [1] with MG and DAI as ligands. Full crystallographic information is available from OCA.

Reference

Structural basis for Diels-Alder ribozyme-catalyzed carbon-carbon bond formation., Serganov A, Keiper S, Malinina L, Tereshko V, Skripkin E, Hobartner C, Polonskaia A, Phan AT, Wombacher R, Micura R, Dauter Z, Jaschke A, Patel DJ, Nat Struct Mol Biol. 2005 Mar;12(3):218-24. Epub 2005 Feb 20. PMID:15723077

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