Crystal structure of Laterosporulin, a broad spectrum leaderless bacteriocin produced by Brevibacillus laterosporus strain GI-9

Experimental Data Snapshot

  • Resolution: 2.04 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 

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The intramolecular disulfide-stapled structure of laterosporulin, a class IId bacteriocin, conceals a human defensin-like structural module.

Singh, P.K.Solanki, V.Sharma, S.Thakur, K.G.Krishnan, B.Korpole, S.

(2015) FEBS J 282: 203-214

  • DOI: https://doi.org/10.1111/febs.13129
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The growing emergence of antibiotic-resistant bacteria has led to the exploration of naturally occurring defense peptides as antimicrobials. In this study, we found that laterosporulin (LS), a class IId bacteriocin, effectively kills active and nonmultiplying cells of both Gram-positive and Gram-negative bacteria. Fluorescence and electron microscopy suggest that growth inhibition occurs because of increased membrane permeability. The crystal structure of LS at 2.0 Å resolution reveals an all-β conformation of this peptide, with four β-strands forming a twisted β-sheet. All six intrinsic cysteines are intramolecularly disulfide-bonded, with two disulfides constraining the N terminus of the peptide and the third disulfide crosslinking the extreme C terminus, resulting in the formation of a closed structure. The significance of disulfides in maintaining the in-solution peptide structure was confirmed by CD and fluorescence analyses. Despite a low overall sequence similarity, LS has disulfide connectivity [C(I)-C(V), C(II)-C(IV), and C(III)-C(VI)] like that of β-defensins and a striking architectural similarity with α-defensins. Therefore LS presents a missing link between bacteriocins and mammalian defensins, and is also a potential antimicrobial lead, in particular against nonmultiplying bacteria.

  • Organizational Affiliation

    Microbial Type Culture Collection & Gene Bank, CSIR-Institute of Microbial Technology, Chandigarh, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative bacteriocin49Brevibacillus laterosporus GI-9Mutation(s): 0 
Find proteins for H1ZZ98 (Brevibacillus sp. GI-9)
Explore H1ZZ98 
Go to UniProtKB:  H1ZZ98
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupH1ZZ98
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.04 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.198 
  • Space Group: P 43 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65α = 90
b = 65β = 90
c = 65γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
MOSFLMdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Council of Scientific and Insdustrial Research, Govt. of IndiaIndia--

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-12
    Type: Initial release
  • Version 1.1: 2014-12-03
    Changes: Database references
  • Version 1.2: 2015-02-04
    Changes: Database references
  • Version 1.3: 2017-11-22
    Changes: Advisory, Derived calculations, Other, Refinement description, Source and taxonomy