1ykq

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{{STRUCTURE_1ykq| PDB=1ykq | SCENE= }}
{{STRUCTURE_1ykq| PDB=1ykq | SCENE= }}
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'''Crystal structure of Diels-Alder ribozyme'''
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===Crystal structure of Diels-Alder ribozyme===
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==Overview==
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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.
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(as it appears on PubMed at http://www.pubmed.gov), where 15723077 is the PubMed ID number.
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==About this Structure==
==About this Structure==
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[[Category: Ribozyme]]
[[Category: Ribozyme]]
[[Category: Rna crystal structure]]
[[Category: Rna crystal structure]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 16:26:37 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 12:50:46 2008''

Revision as of 09:50, 28 July 2008

Image:1ykq.png

Template:STRUCTURE 1ykq

Crystal structure of Diels-Alder ribozyme

Template:ABSTRACT PUBMED 15723077

About this Structure

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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