Solution structure of bacteriocin AS-48

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: NONE 

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This is version 1.2 of the entry. See complete history


Bacteriocin as-48, a Microbial Cyclic Polypeptide Structurally and Functionally Related to Mammalian Nk-Lysin

Gonzalez, C.Langdon, G.Bruix, M.Galvez, A.Valdivia, E.Maqueda, M.Rico, M.

(2000) Proc Natl Acad Sci U S A 97: 11221

  • DOI: https://doi.org/10.1073/pnas.210301097
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The solution structure of bacteriocin AS-48, a 70-residue cyclic polypeptide from Enterococcus faecalis, consists of a globular arrangement of five alpha-helices enclosing a compact hydrophobic core. The head-to-tail union lies in the middle of helix 5, a fact that is shown to have a pronounced effect on the stability of the three-dimensional structure. Positive charges in the side chains of residues in helix 4 and in the turn linking helix 4 to helix 5 form a cluster that most probably determine its antibacterial activity by promoting pore formation in cell membranes. A similar five-helix structural motif has been found in the antimicrobial NK-lysin, an effector polypeptide of T and natural killer (NK) cells. Bacteriocin AS-48 lacks the three disulfide bridges characteristic of the saposin fold present in NK-lysin, and has no sequence homology with it. Nevertheless, the similar molecular architecture and high positive charge strongly suggest a common mechanism of antibacterial action.

  • Organizational Affiliation

    Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, Madrid 28006, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AS-48 PROTEIN70Enterococcus faecalisMutation(s): 0 
Find proteins for Q47765 (Enterococcus faecalis)
Explore Q47765 
Go to UniProtKB:  Q47765
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47765
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: NONE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-10-25
    Type: Initial release
  • Version 1.1: 2011-08-03
    Changes: Database references, Derived calculations, Other, Refinement description, Structure summary, Version format compliance
  • Version 1.2: 2024-05-15
    Changes: Data collection, Database references