Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 4.57 kDa 
• Atom Count: 323 
• Modelled Residue Count: 37 
• Deposited Residue Count: 37 
• Unique protein chains: 1

5L82

NMR Structure of Enterocin K1 in 50%/50% TFE/Water

• PDB DOI: 10.2210/pdb5L82/pdb
• BMRB: 34006

• Classification: ANTIBIOTIC
• Organism(s): Enterococcus faecium EnGen0026
• Mutation(s): No 


• Deposited: 2016-06-06 Released: 2017-05-17 
• Deposition Author(s): Ovchinnikov, K., Kristiansen, P.E., Diep, D.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

The Leaderless Bacteriocin Enterocin K1 Is Highly Potent against Enterococcus faecium: A Study on Structure, Target Spectrum and Receptor.

Ovchinnikov, K.V., Kristiansen, P.E., Straume, D., Jensen, M.S., Aleksandrzak-Piekarczyk, T., Nes, I.F., Diep, D.B.

(2017) Front Microbiol 8: 774-774

• PubMed: 28515717 
• DOI: 10.3389/fmicb.2017.00774
• Primary Citation of Related Structures:  
  5L82


• PubMed Abstract: 
  

Enterocin K1 (EntK1), enterocin EJ97 (EntEJ97), and LsbB are three sequence related leaderless bacteriocins. Yet LsbB kills only lactococci while EntK1 and EntEJ97 target wider spectra with EntK1 being particularly active against Enterococcus faecium , including nosocomial multidrug resistant isolates. NMR study of EntK1 showed that it had a structure very similar to LsbB - both having an amphiphilic N-terminal α-helix and an unstructured C-terminus. The α-helix in EntK1 is, however, about 3-4 residues longer than that of LsbB. Enterococcal mutants highly resistant to EntEJ97 and EntK1 were found to have mutations within rseP , a gene encoding a stress response membrane-bound Zn-dependent protease. Heterologous expression of the enterococcal rseP rendered resistant cells of Streptococcus pneumoniae sensitive to EntK1 and EntEJ97, suggesting that RseP likely serves as the receptor for EntK1 and EntEJ97. It was also shown that the conserved proteolytic active site in E. faecalis RseP is partly required for EntK1 and EntEJ97 activity, since alanine substitutions of its conserved residues (HExxH) reduced the sensitivity of the clones to the bacteriocins. RseP is known to be involved in bacterial stress response. As expected, the growth of resistant mutants with mutations within rseP was severely affected when they were exposed to higher (stressing) growth temperatures, e.g., at 45°C, at which wild type cells still grew well. These findings allow us to design a hurdle strategy with a combination of the bacteriocin(s) and higher temperature that effectively kills bacteriocin sensitive bacteria and prevents the development of resistant cells.

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Organizational Affiliation: 

Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life SciencesÅs, Norway.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Enterococcin K1	A	37	Enterococcus faecium EnGen0026	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 5L82 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2016-06-06 
• Released Date: 2017-05-17 
Deposition Author(s): Ovchinnikov, K., Kristiansen, P.E., Diep, D.

Revision History  

• Version 1.0: 2017-05-17
  Type: Initial release
  
• Version 1.1: 2017-12-06
  Changes: Database references
• Version 1.2: 2019-05-08
  Changes: Data collection
• Version 2.0: 2019-10-23
  Changes: Atomic model, Data collection, Experimental preparation