4HT8

Crystal structure of E coli Hfq bound to poly(A) A7


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Hfq-bridged ternary complex is important for translation activation of rpoS by DsrA.

Wang, W.Wang, L.Wu, J.Gong, Q.Shi, Y.

(2013) Nucleic Acids Res. 41: 5938-5948

  • DOI: 10.1093/nar/gkt276
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The rpoS mRNA, which encodes the master regulator σ(S) of general stress response, requires Hfq-facilitated base pairing with DsrA small RNA for efficient translation at low temperatures. It has recently been proposed that one mechanism underlying Hf ...

    The rpoS mRNA, which encodes the master regulator σ(S) of general stress response, requires Hfq-facilitated base pairing with DsrA small RNA for efficient translation at low temperatures. It has recently been proposed that one mechanism underlying Hfq action is to bridge a transient ternary complex by simultaneously binding to rpoS and DsrA. However, no structural evidence of Hfq simultaneously bound to different RNAs has been reported. We detected simultaneous binding of Hfq to rpoS and DsrA fragments. Crystal structures of AU6A•Hfq•A7 and Hfq•A7 complexes were resolved using 1.8- and 1.9-Å resolution, respectively. Ternary complex has been further verified in solution by NMR. In vivo, activation of rpoS translation requires intact Hfq, which is capable of bridging rpoS and DsrA simultaneously into ternary complex. This ternary complex possibly corresponds to a meta-stable transition state in Hfq-facilitated small RNA-mRNA annealing process.


    Organizational Affiliation

    Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230026, P R China.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein hfq
A, B, C, D, E, F
65Escherichia coli (strain B / BL21-DE3)Mutation(s): 0 
Gene Names: hfq
Find proteins for A0A140NGK1 (Escherichia coli (strain B / BL21-DE3))
Go to UniProtKB:  A0A140NGK1
Entity ID: 2
MoleculeChainsLengthOrganism
RNA (5'-R(*AP*AP*AP*AP*AP*AP*A)-3')I,K7Homo sapiens
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.190 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 103.990α = 90.00
b = 40.710β = 101.36
c = 100.850γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
MOSFLMdata reduction
HKL-2000data collection
PDB_EXTRACTdata extraction
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-11-01 
  • Released Date: 2013-04-17 
  • Deposition Author(s): Wang, W.W., Wang, L.J.

Revision History 

  • Version 1.0: 2013-04-17
    Type: Initial release
  • Version 1.1: 2013-06-19
    Type: Database references
  • Version 1.2: 2013-06-26
    Type: Database references