1E68

Solution structure of bacteriocin AS-48


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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.USA 97: 11221

  • DOI: 10.1073/pnas.210301097

  • 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 ...

    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.


    Related Citations: 
    • Sequence-Specific 1H Assignment and Secondary Structure of the Bacteriocin as-48 Cyclic Peptide
      Langdon, G.,Bruix, M.,Galvez, A.,Valdivia, E.,Maqueda, M.,Rico, M.
      (1998) J.Biomol.NMR 12: 173


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AS-48 PROTEIN
A
70Enterococcus faecalisGene Names: as-48 (as48A, bacA)
Find proteins for Q47765 (Enterococcus faecalis)
Go to UniProtKB:  Q47765
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: NONE 
  • Olderado: 1E68 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-10-25
    Type: Initial release
  • Version 1.1: 2011-08-03
    Type: Database references, Derived calculations, Other, Refinement description, Structure summary, Version format compliance