Crystal structure of an immunity protein that contributes to the self-protection of bacteriocin-producing Enterococcus mundtii 15-1A

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.228 

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Crystal structure and mutagenic analysis of a bacteriocin immunity protein, Mun-im

Jeon, H.J.Noda, M.Matoba, Y.Kumagai, T.Sugiyama, M.

(2009) Biochem Biophys Res Commun 378: 574-578

  • DOI: https://doi.org/10.1016/j.bbrc.2008.11.093
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacteriocin-producing lactic acid bacteria (LAB) possess a self-protection factor, which is generally called an immunity protein. In this study, we determine the crystal structure of an immunity protein, designated Mun-im, which was classified into subgroup B immunity proteins for class IIa bacteriocins. The Mun-im protein takes a left-turning antiparallel four-helix bundle structure with the flexible N- and C-terminal parts. Although the amino acid sequences of the subgroup B immunity proteins are distinguished from those of the subgroup A, the core structure of Mun-im is well-superimposed with that of the subgroup A immunity protein, EntA-im, and the C-terminus of both proteins is flexible. However, the C-terminus of Mun-im is obviously shorter than that of the subgroup A. We found through mutagenic study of Mun-im that the C-terminus and the K86 residue on the helix 4 in the immunity protein molecule are important for expression of the immunity activity on the subgroup B immunity proteins.

  • Organizational Affiliation

    Department of Molecular Microbiology and Biotechnology, Graduate School of Biomedical Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima 734-8551, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mundticin KS immunity protein118Enterococcus mundtiiMutation(s): 0 
Gene Names: orf8
Find proteins for B9A7V6 (Enterococcus mundtii)
Explore B9A7V6 
Go to UniProtKB:  B9A7V6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB9A7V6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.228 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 28.71α = 90
b = 73.78β = 90
c = 94.76γ = 90
Software Package:
Software NamePurpose
BSSdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-03-13
    Changes: Data collection, Database references