6IN9

Crystal structure of MucB in complex with MucA(peri)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for the recognition of MucA by MucB and AlgU in Pseudomonas aeruginosa.

Li, S.Lou, X.Xu, Y.Teng, X.Liu, R.Zhang, Q.Wu, W.Wang, Y.Bartlam, M.

(2019) FEBS J 286: 4982-4994

  • DOI: 10.1111/febs.14995
  • Primary Citation of Related Structures:  
    6IN8, 6IN7, 6IN9

  • PubMed Abstract: 
  • Alginate production in Pseudomonas aeruginosa is regulated by the alternate σ factor AlgU, which in turn is regulated by the MucABCD system. The anti-σ factor MucA binds AlgU in the cytoplasm and prevents AlgU from binding to the RNA polymerase for t ...

    Alginate production in Pseudomonas aeruginosa is regulated by the alternate σ factor AlgU, which in turn is regulated by the MucABCD system. The anti-σ factor MucA binds AlgU in the cytoplasm and prevents AlgU from binding to the RNA polymerase for transcription. MucB binds MucA in the periplasm and inhibits proteolysis of MucA and subsequent release of AlgU. In this work, we report crystal structures of MucA in complex with AlgU and MucB. A structure of MucB alone reveals the structural changes required for MucA recognition. A unique disulfide bond is identified in MucB, and mutation of this disulfide bond results in a shift from monomer to MucB dimers or tetramers. As MucB tetramers have previously been shown to be unable to bind MucA, this suggests a redox-sensitive stress response mechanism in MucB. The AlgU-MucA structure reveals a conserved σ factor/anti-σ factor complex, but AlgU lacks a disulfide bond conserved in many other σ factors. Our structures reveal the molecular basis for MucA recognition by MucB in the periplasm and AlgU in the cytoplasm, thus providing an important step in understanding the mechanisms that regulate a key signal transduction pathway involved in P. aeruginosa pathogenesis. DATABASE: The atomic coordinates and structure factors for MucA cyto -AlgU, MucB, and MucA peri -MucB have been deposited in the Protein Data Bank (PDB) with the accession code 6IN7, 6IN8, and 6IN9, respectively.


    Organizational Affiliation

    College of Life Sciences, Nankai University, Tianjin, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Sigma factor AlgU regulatory protein MucBAB295Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: mucBalgNPA0764
Find proteins for P38108 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P38108 
Go to UniProtKB:  P38108
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Sigma factor AlgU negative regulatory proteinCD89Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: mucAPA0763
Find proteins for P38107 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore P38107 
Go to UniProtKB:  P38107
Protein Feature View
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 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.189 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.149α = 90
b = 50.268β = 109.05
c = 100.137γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31570128

Revision History 

  • Version 1.0: 2019-07-24
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Database references