Download MendeleyIntermediate states of ribonuclease III in complex with double-stranded RNA
Gan, J., Tropea, J.E., Austin, B.P., Court, D.L., Waugh, D.S., Ji, X.(2005) Structure 13: 1435-1442
- PubMed: 16216575 Search on PubMed
- DOI: https://doi.org/10.1016/j.str.2005.06.014
- Primary Citation Related Structures:
1YYK, 1YYO, 1YYW, 1YZ9 - PubMed Abstract:
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.
- Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, Maryland 21702, USA.
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