4KRF

Structure of Human Argonaute-1 let-7 complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 

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This is version 1.1 of the entry. See complete history. 


Literature

The making of a slicer: activation of human argonaute-1.

Faehnle, C.R., Elkayam, E., Haase, A.D., Hannon, G.J., Joshua-Tor, L.

(2013) Cell Rep 3: 1901-1909

  • DOI: https://doi.org/10.1016/j.celrep.2013.05.033
  • Primary Citation of Related Structures:  
    4KRE, 4KRF

  • PubMed Abstract: 

    • Argonautes are the central protein component in small RNA silencing pathways. Of the four human Argonautes (hAgo1-hAgo4) only hAgo2 is an active slicer. We determined the structure of hAgo1 bound to endogenous copurified RNAs to 1.75 Å resolution and hAgo1 loaded with let-7 microRNA to 2 ...

    Argonautes are the central protein component in small RNA silencing pathways. Of the four human Argonautes (hAgo1-hAgo4) only hAgo2 is an active slicer. We determined the structure of hAgo1 bound to endogenous copurified RNAs to 1.75 Å resolution and hAgo1 loaded with let-7 microRNA to 2.1 Å. Both structures are strikingly similar to the structures of hAgo2. A conserved catalytic tetrad within the PIWI domain of hAgo2 is required for its slicing activity. Completion of the tetrad, combined with a mutation on a loop adjacent to the active site of hAgo1, results in slicer activity that is substantially enhanced by swapping in the N domain of hAgo2. hAgo3, with an intact tetrad, becomes an active slicer by swapping the N domain of hAgo2 without additional mutations. Intriguingly, the elements that make Argonaute an active slicer involve a sophisticated interplay between the active site and more distant regions of the enzyme.

    Organizational Affiliation: 

    W.M. Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein argonaute-1A858Homo sapiensMutation(s): 0 
Gene Names: AGO1, EIF2C1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UL18 (Homo sapiens)
Explore Q9UL18 
Go to UniProtKB:  Q9UL18
PHAROS:  Q9UL18
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UL18
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP*AP*GP*UP*U)-3')B [auth R]22N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.177 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.39α = 90
b = 97.73β = 110.89
c = 72.7γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
CBASSdata collection
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-19
    Type: Initial release
  • Version 1.1: 2013-07-17
    Changes: Database references