Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 7177.54 
• Atom Count: 504 
• Residue Count: 70 
• Unique protein chains: 1

1E68

Solution structure of bacteriocin AS-48

• DOI: 10.2210/pdb1E68/pdb
• BMRB: 4112

• Classification: ANTIBIOTIC
• Organism(s): Enterococcus faecalis


• Deposited: 2000-08-09 Released: 2000-10-25 
• Deposition Author(s): Gonzalez, C., Langdon, G., Bruix, M., Galvez, A., Valdivia, E., Maqueda, M., Rico, M.

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Experimental Data Snapshot

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

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

• PubMed: 11005847 
• 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 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.

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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




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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
Molecule	Chains	Sequence Length	Organism	Details
AS-48 PROTEIN	A	70	Enterococcus faecalis	Mutation(s): 0  Gene 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

Entry History 

Deposition Data

• Deposited Date: 2000-08-09 
• Released Date: 2000-10-25 
• Deposition Author(s): Gonzalez, C., Langdon, G., Bruix, M., Galvez, A., Valdivia, E., Maqueda, M., Rico, M.

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