1yz9
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Crystal structure of RNase III mutant E110Q from Aquifex aeolicus complexed with double stranded RNA at 2.1-Angstrom Resolution
OverviewOverview
Bacterial ribonuclease III (RNase III) can affect RNA structure and gene expression in either of two ways: as a processing enzyme that cleaves double-stranded (ds) RNA, or as a binding protein that binds but does not cleave dsRNA. We previously proposed a model of the catalytic complex of RNase III with dsRNA based on three crystal structures, including the endonuclease domain of RNase III with and without bound metal ions and a dsRNA binding protein complexed with dsRNA. We also reported a noncatalytic assembly observed in the crystal structure of an RNase III mutant, which binds but does not cleave dsRNA, complexed with dsRNA. We hypothesize that the RNase III*dsRNA complex can exist in two functional forms, a catalytic complex and a noncatalytic assembly, and that in between the two forms there may be intermediate states. Here, we present four crystal structures of RNase III complexed with dsRNA, representing possible intermediates.
About this StructureAbout this Structure
1YZ9 is a Single protein structure of sequence from Aquifex aeolicus with as ligand. Active as Ribonuclease III, with EC number 3.1.26.3 Full crystallographic information is available from OCA.
ReferenceReference
Intermediate states of ribonuclease III in complex with double-stranded RNA., Gan J, Tropea JE, Austin BP, Court DL, Waugh DS, Ji X, Structure. 2005 Oct;13(10):1435-42. PMID:16216575
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