Crystal Structure of Bacillus subtilis RsbS

Experimental Data Snapshot

  • Resolution: 3.10 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 

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Structural insights into stressosome assembly.

Kwon, E.Pathak, D.Kim, H.U.Dahal, P.Ha, S.C.Lee, S.S.Jeong, H.Jeoung, D.Chang, H.W.Jung, H.S.Kim, D.Y.

(2019) IUCrJ 6: 938-947

  • DOI: https://doi.org/10.1107/S205225251900945X
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The stressosome transduces environmental stress signals to SigB to upregulate SigB-dependent transcription, which is required for bacterial viability. The stressosome core is composed of RsbS and at least one of the RsbR paralogs. A previous cryo-electron microscopy (cryo-EM) structure of the RsbRA-RsbS complex determined under a D 2 symmetry restraint showed that the stressosome core forms a pseudo-icosahedron consisting of 60 STAS domains of RsbRA and RsbS. However, it is still unclear how RsbS and one of the RsbR paralogs assemble into the stressosome. Here, an assembly model of the stressosome is presented based on the crystal structure of the RsbS icosahedron and cryo-EM structures of the RsbRA-RsbS complex determined under diverse symmetry restraints (nonsymmetric C 1, dihedral D 2 and icosahedral I envelopes). 60 monomers of the crystal structure of RsbS fitted well into the I -restrained cryo-EM structure determined at 4.1 Å resolution, even though the STAS domains in the I envelope were averaged. This indicates that RsbS and RsbRA share a highly conserved STAS fold. 22 protrusions observed in the C 1 envelope, corresponding to dimers of the RsbRA N-domain, allowed the STAS domains of RsbRA and RsbS to be distinguished in the stressosome core. Based on these, the model of the stressosome core was reconstructed. The mutation of RsbRA residues at the binding interface in the model (R189A/Q191A) significantly reduced the interaction between RsbRA and RsbS. These results suggest that nonconserved residues in the conserved STAS folds between RsbS and RsbR paralogs determine stressosome assembly.

  • Organizational Affiliation

    Center for Electron Microscopy Research, Korea Basic Science Institute, Ochang 28119, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RsbS negative regulator of sigma-B
A, B, C, D, E
123Bacillus subtilisMutation(s): 0 
Gene Names: B4122_0858B4417_4413CJ481_02205ETA10_02695ETK61_02665ETK71_02600
Find proteins for P42410 (Bacillus subtilis (strain 168))
Explore P42410 
Go to UniProtKB:  P42410
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42410
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on SEP
A, B, C, D, E
Experimental Data & Validation

Experimental Data

  • Resolution: 3.10 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.213 
  • Space Group: I 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 179.201α = 90
b = 179.201β = 90
c = 179.201γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Research Foundation (Korea)Korea, Republic Of--

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-11
    Type: Initial release
  • Version 1.1: 2019-11-20
    Changes: Database references