6TV6

Octameric McsB from Bacillus subtilis.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.195 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

McsB forms a gated kinase chamber to mark aberrant bacterial proteins for degradation.

Hajdusits, B.Suskiewicz, M.J.Hundt, N.Meinhart, A.Kurzbauer, R.Leodolter, J.Kukura, P.Clausen, T.

(2021) Elife 10

  • DOI: https://doi.org/10.7554/eLife.63505
  • Primary Citation of Related Structures:  
    6TV6

  • PubMed Abstract: 

    In Gram-positive bacteria, the McsB protein arginine kinase is central to protein quality control, labeling aberrant molecules for degradation by the ClpCP protease. Despite its importance for stress response and pathogenicity, it is still elusive how the bacterial degradation labeling is regulated. Here, we delineate the mechanism how McsB targets aberrant proteins during stress conditions. Structural data reveal a self-compartmentalized kinase, in which the active sites are sequestered in a molecular cage. The 'closed' octamer interconverts with other oligomers in a phosphorylation-dependent manner and, unlike these 'open' forms, preferentially labels unfolded proteins. In vivo data show that heat-shock triggers accumulation of higher order oligomers, of which the octameric McsB is essential for surviving stress situations. The interconversion of open and closed oligomers represents a distinct regulatory mechanism of a degradation labeler, allowing the McsB kinase to adapt its potentially dangerous enzyme function to the needs of the bacterial cell.


  • Organizational Affiliation

    Research Institute of Molecular Pathology (IMP), Vienna BioCenter, Vienna, Austria.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein-arginine kinase
A, B, C, D
374Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: mcsByacIBSU00850
EC: 2.7.14.1
UniProt
Find proteins for P37570 (Bacillus subtilis (strain 168))
Explore P37570 
Go to UniProtKB:  P37570
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP37570
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.195 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 137.79α = 90
b = 147.64β = 90
c = 81.47γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PHASERphasing
PHENIXrefinement
Cootmodel building

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)Austria694978

Revision History  (Full details and data files)

  • Version 1.0: 2021-07-21
    Type: Initial release
  • Version 1.1: 2022-08-03
    Changes: Database references, Derived calculations
  • Version 1.2: 2024-01-24
    Changes: Data collection, Derived calculations, Refinement description