4MMG

crystal structure of YafQ mutant H87Q from E.coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.164 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural and Functional Characterization of Escherichia coli Toxin-Antitoxin Complex DinJ-YafQ

Liang, Y.Gao, Z.Wang, F.Zhang, Y.Dong, Y.Liu, Q.

(2014) J Biol Chem 289: 21191-21202

  • DOI: 10.1074/jbc.M114.559773
  • Primary Citation of Related Structures:  
    4ML0, 4ML2, 4MMG, 4MMJ

  • PubMed Abstract: 
  • Toxin YafQ functions as a ribonuclease in the dinJ-yafQ toxin-antitoxin system of Escherichia coli. Antitoxin DinJ neutralizes YafQ-mediated toxicity by forming a stable protein complex. Here, crystal structures of the (DinJ)2-(YafQ)2 complex and the ...

    Toxin YafQ functions as a ribonuclease in the dinJ-yafQ toxin-antitoxin system of Escherichia coli. Antitoxin DinJ neutralizes YafQ-mediated toxicity by forming a stable protein complex. Here, crystal structures of the (DinJ)2-(YafQ)2 complex and the isolated YafQ toxin have been determined. The structure of the heterotetrameric complex (DinJ)2-(YafQ)2 revealed that the N-terminal region of DinJ folds into a ribbon-helix-helix motif and dimerizes for DNA recognition, and the C-terminal portion of each DinJ exclusively wraps around a YafQ molecule. Upon incorporation into the heterotetrameric complex, a conformational change of YafQ in close proximity to the catalytic site of the typical microbial ribonuclease fold was observed and validated. Mutagenesis experiments revealed that a DinJ mutant restored YafQ RNase activity in a tetramer complex in vitro but not in vivo. An electrophoretic mobility shift assay showed that one of the palindromic sequences present in the upstream intergenic region of DinJ served as a binding sequences for both the DinJ-YafQ complex and the antitoxin DinJ alone. Based on structure-guided and site-directed mutagenesis of DinJ-YafQ, we showed that two pairs of amino acids in DinJ were important for DNA binding; the R8A and K16A substitutions and the S31A and R35A substitutions in DinJ abolished the DNA binding ability of the DinJ-YafQ complex.


    Organizational Affiliation

    the Multidiscipline Research Center, Institute of High Energy Physics of the Chinese Academy of Sciences, 19B Yuequan Road, Beijing 100049, China, and liuqsh@ihep.ac.cn.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
mRNA interferase YafQAB95Escherichia coli K-12Mutation(s): 1 
Gene Names: yafQb0225JW0215
EC: 3.1
Find proteins for Q47149 (Escherichia coli (strain K12))
Explore Q47149 
Go to UniProtKB:  Q47149
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.164 
  • R-Value Observed: 0.164 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.839α = 109.93
b = 42.485β = 106.12
c = 43.278γ = 102.07
Software Package:
Software NamePurpose
MAR345data collection
SOLVEphasing
PHENIXrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-06-25
    Type: Initial release
  • Version 1.1: 2014-08-20
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description