4W5T

The Crystal Structure of Human Argonaute2 Bound to a Guide and Target RNA Containing Seed Pairing from 2-7

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 

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


Literature

Gene regulation. Structural basis for microRNA targeting.

Schirle, N.T., Sheu-Gruttadauria, J., MacRae, I.J.

(2014) Science 346: 608-613

  • DOI: 10.1126/science.1258040
  • Primary Citation of Related Structures:  
    4W5N, 4W5O, 4W5Q, 4W5R, 4W5T

  • PubMed Abstract: 

    • MicroRNAs (miRNAs) control expression of thousands of genes in plants and animals. miRNAs function by guiding Argonaute proteins to complementary sites in messenger RNAs (mRNAs) targeted for repression. We determined crystal structures of human Argonaute-2 (Ago2) bound to a defined guide RNA with and without target RNAs representing miRNA recognition sites ...

    MicroRNAs (miRNAs) control expression of thousands of genes in plants and animals. miRNAs function by guiding Argonaute proteins to complementary sites in messenger RNAs (mRNAs) targeted for repression. We determined crystal structures of human Argonaute-2 (Ago2) bound to a defined guide RNA with and without target RNAs representing miRNA recognition sites. These structures suggest a stepwise mechanism, in which Ago2 primarily exposes guide nucleotides (nt) 2 to 5 for initial target pairing. Pairing to nt 2 to 5 promotes conformational changes that expose nt 2 to 8 and 13 to 16 for further target recognition. Interactions with the guide-target minor groove allow Ago2 to interrogate target RNAs in a sequence-independent manner, whereas an adenosine binding-pocket opposite guide nt 1 further facilitates target recognition. Spurious slicing of miRNA targets is avoided through an inhibitory coordination of one catalytic magnesium ion. These results explain the conserved nucleotide-pairing patterns in animal miRNA target sites first observed over two decades ago.

    Organizational Affiliation: 

    Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA. macrae@scripps.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein argonaute-2A859Homo sapiensMutation(s): 1 
Gene Names: AGO2, EIF2C2
EC: 3.1.26
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UKV8 (Homo sapiens)
Explore Q9UKV8 
Go to UniProtKB:  Q9UKV8
PHAROS:  Q9UKV8
GTEx:  ENSG00000123908 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UKV8
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsLengthOrganismImage
RNA (5'-R(P*UP*UP*CP*AP*CP*AP*UP*UP*GP*CP*CP*CP*AP*AP*UP*U)-3')B 21synthetic construct
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
RNA (5'-R(*AP*CP*AP*UP*GP*UP*GP*AP*AP*A)-3')C [auth D]11synthetic construct
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.636α = 90
b = 116.468β = 92.33
c = 69.822γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-12
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary