Structure-based cleavage mechanism of Thermus thermophilus Argonaute DNA guide strand-mediated DNA target cleavage
- PMID: 24374628
- PMCID: PMC3896195
- DOI: 10.1073/pnas.1321032111
Structure-based cleavage mechanism of Thermus thermophilus Argonaute DNA guide strand-mediated DNA target cleavage
Abstract
We report on crystal structures of ternary Thermus thermophilus Argonaute (TtAgo) complexes with 5'-phosphorylated guide DNA and a series of DNA targets. These ternary complex structures of cleavage-incompatible, cleavage-compatible, and postcleavage states solved at improved resolution up to 2.2 Å have provided molecular insights into the orchestrated positioning of catalytic residues, a pair of Mg(2+) cations, and the putative water nucleophile positioned for in-line attack on the cleavable phosphate for TtAgo-mediated target cleavage by a RNase H-type mechanism. In addition, these ternary complex structures have provided insights into protein and DNA conformational changes that facilitate transition between cleavage-incompatible and cleavage-compatible states, including the role of a Glu finger in generating a cleavage-competent catalytic Asp-Glu-Asp-Asp tetrad. Following cleavage, the seed segment forms a stable duplex with the complementary segment of the target strand.
Keywords: DNA guide-DNA target; bacterial Argonaute; catalytic mechanism.
Conflict of interest statement
The authors declare no conflict of interest.
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References
-
- Peters L, Meister G. Argonaute proteins: Mediators of RNA silencing. Mol Cell. 2007;26(5):611–623. - PubMed
-
- Hutvagner G, Simard MJ. Argonaute proteins: Key players in RNA silencing. Nat Rev Mol Cell Biol. 2008;9(1):22–32. - PubMed
-
- Kawamata T, Tomari Y. Making RISC. Trends Biochem Sci. 2010;35(7):368–376. - PubMed
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