Macromolecule Content

• Total Structure Weight: 3937.32 
• Atom Count: 278 
• Residue Count: 37 
• Unique protein chains: 1

2LEU

HIGH RESOLUTION 1H NMR STUDY OF LEUCOCIN A IN 90% AQUEOUS TRIFLUOROETHANOL (TFE) (0.1% TFA), 18 STRUCTURES

• DOI: 10.2210/pdb2LEU/pdb
• BMRB: 4507

• Classification: ANTIBACTERIAL PEPTIDE
• Organism(s): Leuconostoc gelidum


• Deposited: 1997-05-20 Released: 1997-11-26 
• Deposition Author(s): Gallagher, N.L.F., Sailer, M., Niemczura, W.P., Nakashima, T.T., Stiles, M.E., Vederas, J.C.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 18 
• Selection Criteria: LEAST RESTRAINT VIOLATION 

Literature

Three-dimensional structure of leucocin A in trifluoroethanol and dodecylphosphocholine micelles: spatial location of residues critical for biological activity in type IIa bacteriocins from lactic acid bacteria.

Fregeau Gallagher, N.L., Sailer, M., Niemczura, W.P., Nakashima, T.T., Stiles, M.E., Vederas, J.C.

(1997) Biochemistry 36: 15062-15072

• PubMed: 9398233 
• DOI: 10.1021/bi971263h
• Primary Citation of Related Structures:  
  3LEU


• PubMed Abstract: 
  

The first three-dimensional structure of a type IIa bacteriocin from lactic acid bacteria is reported. Complete 1H resonance assignments of leucocin A, a 37 amino acid antimicrobial peptide isolated from the lactic acid bacterium Leuconostoc gelidum UAL187, were determined in 90% trifluoroethanol (TFE)-water and in aqueous dodecylphosphocholine (DPC) micelles (1:40 ratio of leucocin A:DPC) using two-dimensional NMR techniques (e.g., DQF-COSY, TOCSY, NOESY). Circular dichroism spectra, NMR chemical shift indices, amide hydrogen exchange rates, and long-range nuclear Overhauser effects indicate that leucocin A adopts a reasonably well defined structure in both TFE and DPC micelle environments but exists as a random coil in water or aqueous DMSO. Distance geometry and simulated annealing calculations were employed to generate structures for leucocin A in both lipophilic media. While some differences were noted between the structures calculated for the two different solvent systems, in both, the region encompassing residues 17-31 assumes an essentially identical amphiphilic alpha-helix conformation. A three-strand antiparallel beta-sheet domain (residues 2-16), anchored by the disulfide bridge, is also observed in both media. In TFE, these two regions have a more defined relationship relative to each other, while, in DPC micelles, the C-terminus is folded back onto the alpha-helix. The implications of these structural features with regard to the antimicrobial mechanism of action and target recognition are discussed.

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Related Citations: 

• 15N-and 13C-Labeled Media from Anabaena Sp. For Universal Isotopic Labeling of Bacteriocins: NMR Resonance Assignments of Leucocin a from Leuconostoc Gelidum and Nisin a from Lactococcus Lactis
  Sailer, M.,Helms, G.L.,Henkel, T.,Niemczura, W.P.,Stiles, M.E.,Vederas, J.C.
  (1993) Biochemistry 32: 310
• Molecular Characterization of Genes Involved in the Production of the Bacteriocin Leucocin a from Leuconostoc Gelidum
  Van Belkum, M.J.,Stiles, M.E.
  (1995) Appl.Environ.Microbiol. 61: 3573
• Characterization of Leucocin A-Ual 187 and Cloning of the Bacteriocin Gene from Leuconostoc Gelidum
  Hastings, J.W.,Sailer, M.,Johnson, K.,Roy, K.L.,Vederas, J.C.,Stiles, M.E.
  (1991) J.Bacteriol. 173: 7491
• NMR Assignment of Leucocin A, a Bacteriocin from Leuconostoc Gelidum, Supported by a Stable Isotope Labeling Technique for Peptides and Proteins
  Henkel, T.,Sailer, M.,Helms, G.L.,Stiles, M.E.,Vederas, J.C.
  (1992) J.Am.Chem.Soc. 114: 1898




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Organizational Affiliation: 

Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
LEUCOCIN A	A	37	Leuconostoc gelidum	Mutation(s): 0  Gene Names: lcnA
Find proteins for P34034 (Leuconostoc gelidum) Go to UniProtKB:  P34034

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 18 
• Selection Criteria: LEAST RESTRAINT VIOLATION 
• Olderado: 2LEU Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-05-20 
• Released Date: 1997-11-26 
• Deposition Author(s): Gallagher, N.L.F., Sailer, M., Niemczura, W.P., Nakashima, T.T., Stiles, M.E., Vederas, J.C.

Revision History 

• Version 1.0: 1997-11-26
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance