5J2Y

Molecular insight into the regulatory mechanism of the quorum-sensing repressor RsaL in Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.225 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal structure of Pseudomonas aeruginosa RsaL bound to promoter DNA reaffirms its role as a global regulator involved in quorum-sensing.

Kang, H.Gan, J.Zhao, J.Kong, W.Zhang, J.Zhu, M.Li, F.Song, Y.Qin, J.Liang, H.

(2017) Nucleic Acids Res 45: 699-710

  • DOI: https://doi.org/10.1093/nar/gkw954
  • Primary Citation of Related Structures:  
    5J2Y

  • PubMed Abstract: 

    Pseudomonas aeruginosa possesses at least three well-defined quorum-sensing (QS) (las, rhl and pqs) systems that control a variety of important functions including virulence. RsaL is a QS repressor that reduces QS signal production and ensures homeostasis by functioning in opposition to LasR. However, its regulatory role in signal homeostasis remains elusive. Here, we conducted a ChIP-seq assay and revealed that RsaL bound to two new targets, the intergenic regions of PA2228/PA2229 and pqsH/cdpR, which are required for PQS synthesis. Deletion of rsaL reduced transcription of pqsH and cdpR, thus decreasing PQS signal production. The ΔrsaL strain exhibited increased pyocyanin production and reduced biofilm formation, which are dependent on CdpR or PqsH activity. In addition, we solved the structure of the RsaL-DNA complex at a 2.4 Å resolution. Although the overall sequence similarity is quite low, RsaL folds into a HTH-like structure, which is conserved among many transcriptional regulators. Complementation results of the rsaL knockout cells with different rsaL mutants further confirmed the critical role of the DNA-binding residues (including Arg20, Gln27, Gln38, Gly35, Ser37 and Ser42) that are essential for DNA binding. Our findings reveal new targets of RsaL and provide insight into the detailed characterization of the RsaL-DNA interaction.


  • Organizational Affiliation

    Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, Xi'an, Shaanxi 710069, China.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Regulatory protein
A, B
80Pseudomonas aeruginosaMutation(s): 0 
Gene Names: rsaL
UniProt
Find proteins for Q9X7H4 (Pseudomonas aeruginosa)
Explore Q9X7H4 
Go to UniProtKB:  Q9X7H4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X7H4
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (26-MER)C [auth F],
E [auth f]
26synthetic construct
Sequence Annotations
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (26-MER)D [auth R],
F [auth r]
26synthetic construct
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.225 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.245α = 90
b = 52.983β = 90
c = 69.809γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
AutoSolphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science FoundationChina31000049

Revision History  (Full details and data files)

  • Version 1.0: 2017-04-12
    Type: Initial release
  • Version 1.1: 2023-10-25
    Changes: Data collection, Database references, Refinement description
  • Version 1.2: 2023-11-15
    Changes: Data collection, Database references
  • Version 1.3: 2024-11-13
    Changes: Structure summary