5DMB

Crystal structure of a translational regulator bound to a flagellar assembly factor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.301 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for the CsrA-dependent modulation of translation initiation by an ancient regulatory protein.

Altegoer, F.Rensing, S.A.Bange, G.

(2016) Proc.Natl.Acad.Sci.USA 113: 10168-10173

  • DOI: 10.1073/pnas.1602425113
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Regulation of translation is critical for maintaining cellular protein levels, and thus protein homeostasis. The conserved RNA-binding protein CsrA (also called RsmA; for carbon storage regulator and regulator of secondary metabolism, respectively; h ...

    Regulation of translation is critical for maintaining cellular protein levels, and thus protein homeostasis. The conserved RNA-binding protein CsrA (also called RsmA; for carbon storage regulator and regulator of secondary metabolism, respectively; hereafter called CsrA) represents a well-characterized example of regulation at the level of translation initiation in bacteria. Binding of a CsrA homodimer to the 5'UTR of an mRNA occludes the Shine-Dalgarno sequence, blocking ribosome access for translation. Small noncoding RNAs (sRNAs) can competitively antagonize CsrA activity by a well-understood mechanism. However, the regulation of CsrA by the protein FliW is just emerging. FliW antagonizes the CsrA-dependent repression of translation of the flagellar filament protein, flagellin. Crystal structures of the FliW monomer reveal a novel, minimal β-barrel-like fold. Structural analysis of the CsrA/FliW heterotetramer shows that FliW interacts with a C-terminal extension of CsrA. In contrast to the competitive regulation of CsrA by sRNAs, FliW allosterically antagonizes CsrA in a noncompetitive manner by excluding the 5'UTR from the CsrA-RNA binding site. Our phylogenetic analysis shows that the FliW-mediated regulation of CsrA regulation is the ancestral state in flagellated bacteria. We thus demonstrate fundamental mechanistic differences in the regulation of CsrA by sRNA in comparison with an ancient regulatory protein.


    Organizational Affiliation

    LOEWE Center for Synthetic Microbiology, Department of Chemistry, Philipps University Marburg, 35043 Marburg, Germany; gert.bange@synmikro.uni-marburg.de florian.altegoer@synmikro.uni-marburg.de.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Flagellar assembly factor FliW
A
151Geobacillus thermodenitrificans (strain NG80-2)Mutation(s): 0 
Gene Names: fliW
Find proteins for A4ISV0 (Geobacillus thermodenitrificans (strain NG80-2))
Go to UniProtKB:  A4ISV0
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Carbon storage regulator homolog
D
83Geobacillus thermodenitrificans (strain NG80-2)Mutation(s): 0 
Gene Names: csrA
Find proteins for A4ISU9 (Geobacillus thermodenitrificans (strain NG80-2))
Go to UniProtKB:  A4ISU9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.301 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.224 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 108.876α = 90.00
b = 61.681β = 98.08
c = 42.902γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-24
    Type: Initial release
  • Version 1.1: 2016-09-07
    Type: Database references
  • Version 1.2: 2016-09-21
    Type: Database references
  • Version 1.3: 2018-10-24
    Type: Advisory, Data collection, Derived calculations