Summary information and primary citation

PDB-id
2nug; SNAP-derived features in text and JSON formats; DNAproDB
Class
hydrolase-RNA
Method
X-ray (1.7 Å)
Summary
Crystal structure of rnase iii from aquifex aeolicus complexed with ds-RNA at 1.7-angstrom resolution
Reference
Gan J, Shaw G, Tropea JE, Waugh DS, Court DL, Ji X (2007): "A stepwise model for double-stranded RNA processing by ribonuclease III." Mol.Microbiol., 67, 143-154. doi: 10.1111/j.1365-2958.2007.06032.x.
Abstract
RNA interference is mediated by small interfering RNAs produced by members of the ribonuclease III (RNase III) family represented by bacterial RNase III and eukaryotic Rnt1p, Drosha and Dicer. For mechanistic studies, bacterial RNase III has been a valuable model system for the family. Previously, we have shown that RNase III uses two catalytic sites to create the 2-nucleotide (nt) 3' overhangs in its products. Here, we present three crystal structures of RNase III in complex with double-stranded RNA, demonstrating how Mg(2+) is essential for the formation of a catalytically competent protein-RNA complex, how the use of two Mg(2+) ions can drive the hydrolysis of each phosphodiester bond, and how conformational changes in both the substrate and the protein are critical elements for assembling the catalytic complex. Moreover, we have modelled a protein-substrate complex and a protein-reaction intermediate (transition state) complex on the basis of the crystal structures. Together, the crystal structures and the models suggest a stepwise mechanism for RNase III to execute the phosphoryl transfer reaction.

Cartoon-block schematics in six views (download the tarball)

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