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:
- PubMed Abstract:
- 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
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 ...
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.
Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2.