3M6A

Crystal structure of Bacillus subtilis Lon C-terminal domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.265 
  • R-Value Observed: 0.267 

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Literature

Crystal Structures of Bacillus subtilis Lon Protease.

Duman, R.E.Lowe, J.

(2010) J Mol Biol 401: 653-670

  • DOI: 10.1016/j.jmb.2010.06.030
  • Primary Citation of Related Structures:  
    3M65, 3M6A

  • PubMed Abstract: 
  • Lon ATP-dependent proteases are key components of the protein quality control systems of bacterial cells and eukaryotic organelles. Eubacterial Lon proteases contain an N-terminal domain, an ATPase domain, and a protease domain, all in one polypeptide chain ...

    Lon ATP-dependent proteases are key components of the protein quality control systems of bacterial cells and eukaryotic organelles. Eubacterial Lon proteases contain an N-terminal domain, an ATPase domain, and a protease domain, all in one polypeptide chain. The N-terminal domain is thought to be involved in substrate recognition, the ATPase domain in substrate unfolding and translocation into the protease chamber, and the protease domain in the hydrolysis of polypeptides into small peptide fragments. Like other AAA+ ATPases and self-compartmentalising proteases, Lon functions as an oligomeric complex, although the subunit stoichiometry is currently unclear. Here, we present crystal structures of truncated versions of Lon protease from Bacillus subtilis (BsLon), which reveal previously unknown architectural features of Lon complexes. Our analytical ultracentrifugation and electron microscopy show different oligomerisation of Lon proteases from two different bacterial species, Aquifex aeolicus and B. subtilis. The structure of BsLon-AP shows a hexameric complex consisting of a small part of the N-terminal domain, the ATPase, and protease domains. The structure shows the approximate arrangement of the three functional domains of Lon. It also reveals a resemblance between the architecture of Lon proteases and the bacterial proteasome-like protease HslUV. Our second structure, BsLon-N, represents the first 209 amino acids of the N-terminal domain of BsLon and consists of a globular domain, similar in structure to the E. coli Lon N-terminal domain, and an additional four-helix bundle, which is part of a predicted coiled-coil region. An unexpected dimeric interaction between BsLon-N monomers reveals the possibility that Lon complexes may be stabilised by coiled-coil interactions between neighbouring N-terminal domains. Together, BsLon-N and BsLon-AP are 36 amino acids short of offering a complete picture of a full-length Lon protease.


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-dependent protease La 1A, B, C, D, E, F543Bacillus subtilis subsp. subtilis str. 168Mutation(s): 1 
Gene Names: BSU28200lonlonAlon1
EC: 3.4.21.53
UniProt
Find proteins for P37945 (Bacillus subtilis (strain 168))
Explore P37945 
Go to UniProtKB:  P37945
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.265 
  • R-Value Observed: 0.267 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.382α = 90
b = 127.4β = 100.5
c = 148.993γ = 90
Software Package:
Software NamePurpose
DNAdata collection
PHASESphasing
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-06-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance