4E1R

Crystal structure of the dimerization domain of Lsr2 from Mycobacterium tuberculosis in the P 31 2 1 space group


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.255 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

The structure of the oligomerization domain of Lsr2 from Mycobacterium tuberculosis reveals a mechanism for chromosome organization and protection.

Summers, E.L.Meindl, K.Uson, I.Mitra, A.K.Radjainia, M.Colangeli, R.Alland, D.Arcus, V.L.

(2012) PLoS One 7: e38542-e38542

  • DOI: https://doi.org/10.1371/journal.pone.0038542
  • Primary Citation of Related Structures:  
    4E1P, 4E1R

  • PubMed Abstract: 

    Lsr2 is a small DNA-binding protein present in mycobacteria and related actinobacteria that regulates gene expression and influences the organization of bacterial chromatin. Lsr2 is a dimer that binds to AT-rich regions of chromosomal DNA and physically protects DNA from damage by reactive oxygen intermediates (ROI). A recent structure of the C-terminal DNA-binding domain of Lsr2 provides a rationale for its interaction with the minor groove of DNA, its preference for AT-rich tracts, and its similarity to other bacterial nucleoid-associated DNA-binding domains. In contrast, the details of Lsr2 dimerization (and oligomerization) via its N-terminal domain, and the mechanism of Lsr2-mediated chromosomal cross-linking and protection is unknown. We have solved the structure of the N-terminal domain of Lsr2 (N-Lsr2) at 1.73 Å resolution using crystallographic ab initio approaches. The structure shows an intimate dimer of two ß-ß-a motifs with no close homologues in the structural databases. The organization of individual N-Lsr2 dimers in the crystal also reveals a mechanism for oligomerization. Proteolytic removal of three N-terminal residues from Lsr2 results in the formation of an anti-parallel β-sheet between neighboring molecules and the formation of linear chains of N-Lsr2. Oligomerization can be artificially induced using low concentrations of trypsin and the arrangement of N-Lsr2 into long chains is observed in both monoclinic and hexagonal crystallographic space groups. In solution, oligomerization of N-Lsr2 is also observed following treatment with trypsin. A change in chromosomal topology after the addition of trypsin to full-length Lsr2-DNA complexes and protection of DNA towards DNAse digestion can be observed using electron microscopy and electrophoresis. These results suggest a mechanism for oligomerization of Lsr2 via protease-activation leading to chromosome compaction and protection, and concomitant down-regulation of large numbers of genes. This mechanism is likely to be relevant under conditions of stress where cellular proteases are known to be upregulated.


  • Organizational Affiliation

    Department of Biological Sciences, University of Waikato, Hamilton, New Zealand.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein lsr2
A, B
86Mycobacterium tuberculosisMutation(s): 0 
Gene Names: lsr2MT3704MTCY07H7B.25Rv3597c
UniProt
Find proteins for P9WIP7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WIP7 
Go to UniProtKB:  P9WIP7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WIP7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.04 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.255 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.39α = 90
b = 57.39β = 90
c = 105.31γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
MOSFLMdata reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-20
    Type: Initial release
  • Version 1.1: 2013-01-23
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Refinement description