4QNM

CRYSTAL STRUCTURE of PSPF(1-265) E108Q MUTANT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Molecular basis of nucleotide-dependent substrate engagement and remodeling by an AAA+ activator.

Darbari, V.C.Lawton, E.Lu, D.Burrows, P.C.Wiesler, S.Joly, N.Zhang, N.Zhang, X.Buck, M.

(2014) Nucleic Acids Res 42: 9249-9261

  • DOI: 10.1093/nar/gku588
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Binding and hydrolysis of ATP is universally required by AAA+ proteins to underpin their mechano-chemical work. Here we explore the roles of the ATPase site in an AAA+ transcriptional activator protein, the phage shock protein F (PspF), by specifical ...

    Binding and hydrolysis of ATP is universally required by AAA+ proteins to underpin their mechano-chemical work. Here we explore the roles of the ATPase site in an AAA+ transcriptional activator protein, the phage shock protein F (PspF), by specifically altering the Walker B motif sequence required in catalyzing ATP hydrolysis. One such mutant, the E108Q variant, is defective in ATP hydrolysis but fully remodels target transcription complexes, the RNAP-σ(54) holoenzyme, in an ATP dependent manner. Structural analysis of the E108Q variant reveals that unlike wild-type protein, which has distinct conformations for E108 residue in the ATP and ADP bound forms, E108Q adapts the same conformation irrespective of nucleotide bound. Our data show that the remodeling activities of E108Q are strongly favored on pre-melted DNA and engagement with RNAP-σ(54) using ATP binding can be sufficient to convert the inactive holoenzyme to an active form, while hydrolysis per se is required for nucleic acid remodeling that leads to transcription bubble formation. Furthermore, using linked dimer constructs, we show that RNAP-σ(54) engagement by adjacent subunits within a hexamer are required for this protein remodeling activity while DNA remodeling activity can tolerate defective ATP hydrolysis of alternating subunits.


    Organizational Affiliation

    Department of Life Sciences, Imperial College London, London SW7 2AZ, UK xiaodong.zhang@imperial.ac.uk.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Psp operon transcriptional activatorA265Escherichia coli K-12Mutation(s): 1 
Gene Names: b1303JW1296pspFycjB
Find proteins for P37344 (Escherichia coli (strain K12))
Explore P37344 
Go to UniProtKB:  P37344
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download CCD File 
A
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.721α = 90
b = 113.721β = 90
c = 39.453γ = 120
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
GDAdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-08-06
    Type: Initial release
  • Version 1.1: 2014-09-03
    Changes: Database references