4NCB

Structure of Thermus thermophilus Argonaute bound to guide DNA and 19-mer target DNA with Mg2+

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.178 

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Literature

Structure-based cleavage mechanism of Thermus thermophilus Argonaute DNA guide strand-mediated DNA target cleavage.

Sheng, G., Zhao, H., Wang, J., Rao, Y., Tian, W., Swarts, D.C., van der Oost, J., Patel, D.J., Wang, Y.

(2014) Proc Natl Acad Sci U S A 111: 652-657

  • DOI: 10.1073/pnas.1321032111
  • Primary Citation of Related Structures:  
    4KPY, 4N41, 4N47, 4N76, 4NCA, 4NCB

  • PubMed 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 ...

    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.

    Organizational Affiliation: 

    Laboratory of Non-Coding RNA, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ArgonauteA, B685Thermus thermophilusMutation(s): 0 
Gene Names: Argonaute, TT_P0026
UniProt
Find proteins for Q746M7 (Thermus thermophilus (strain ATCC BAA-163 / DSM 7039 / HB27))
Explore Q746M7 
Go to UniProtKB:  Q746M7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ746M7
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-D(P*TP*GP*AP*GP*GP*TP*AP*GP*TP*AP*GP*GP*TP*TP*GP*TP*AP*TP*AP*GP*T)-3'C,
F [auth E]		21N/A
Protein Feature View
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Entity ID: 3
MoleculeChainsLengthOrganismImage
5'-D(*TP*AP*TP*AP*CP*AP*AP*CP*C)-3'H,
D [auth P]		9N/A
Protein Feature View
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Entity ID: 4
MoleculeChainsLengthOrganismImage
5'-D(*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP*G)-3'E [auth D]19N/A
Protein Feature View
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Entity ID: 5
MoleculeChainsLengthOrganismImage
5'-D(P*TP*AP*CP*TP*AP*CP*CP*TP*CP*G)-3'G [auth F]10N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.19 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.736α = 90
b = 105.363β = 94.25
c = 92.058γ = 90
Software Package:
Software NamePurpose
HKLdata reduction
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKLdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-15
    Type: Initial release
  • Version 1.1: 2014-01-29
    Changes: Database references
  • Version 1.2: 2016-06-08
    Changes: Atomic model