2oiu

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Image:2oiu.gif

2oiu, resolution 2.60Å

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L1 Ribozyme Ligase circular adduct

Overview

Life originated, according to the RNA World hypothesis, from self-replicating ribozymes that catalyzed ligation of RNA fragments. We have solved the 2.6 angstrom crystal structure of a ligase ribozyme that catalyzes regiospecific formation of a 5' to 3' phosphodiester bond between the 5'-triphosphate and the 3'-hydroxyl termini of two RNA fragments. Invariant residues form tertiary contacts that stabilize a flexible stem of the ribozyme at the ligation site, where an essential magnesium ion coordinates three phosphates. The structure of the active site permits us to suggest how transition-state stabilization and a general base may catalyze the ligation reaction required for prebiotic RNA assembly.

About this Structure

2OIU is a Protein complex structure of sequences from [1] with as ligand. Full crystallographic information is available from OCA.

Reference

The structural basis of ribozyme-catalyzed RNA assembly., Robertson MP, Scott WG, Science. 2007 Mar 16;315(5818):1549-53. PMID:17363667

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